US4944972A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coextrusion apparatus, methods, and related films and packages
Assignee: Pechiney Plastic Packaging Inc
•
Filing: 1987-12-31
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Granted: 1990-07-31
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Expires: 2007-12-31
Abstract
Abstract Apparatus and method for fabricating films, especially films containing vinylidene chloride copolymer, wherein the process is susceptible of continued operation over an extended period of time greater than a few days. The process typically can operate for at least 2 weeks between shut downs for cleaning the die. The apparatus comprises a coextrusion feedblock 20 in combination with an annular extrusion die 10 having a crosshead mandrel 11, and means for conveying the exit stream 24 from the feedblock to the die. The particular apparatus combination especially reduces the rate of carbon buildup in the extrusion apparatus during extrusion of VDC-copolymer, such that the extrusion process can be operated for a longer time between shutdowns for cleaning and maintenance of the die. The invention further includes novel tubular films 32 made with the apparatus and methods of the invention, and packages made from the films. In general, the method of the invention produces tubular films having more layers than the annular extrusion die has annular orifices.
Inventors
- 👤 Robert J. Blembereg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:27
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/03; B29C48/07; B29C48/08; B29C48/09; B29C48/10; B29C48/16; B29C48/18; B29C48/185; B29C48/21; B29C48/25; B29C48/30; B29C48/32; B29C48/335; B29C48/34; B29C48/36; B29C48/49; B29C48/495; B32; B32B; B32B1/00; B32B1/08; B32B27/00; B32B27/06; B32B27/08; B32B27/30; B32B27/304; B32B27/306; B32B37/00; B32B37/14; B32B37/15; B32B37/153; B32B2327/00; B32B2327/06; B32B2331/00; B32B2331/04; B32B2553/00; B32B2597/00; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/1334; Y10T428/1341; Y10T428/24; Y10T428/24479; Y10T428/24612; Y10T428/249921; Y10T428/31504; Y10T428/31855; Y10T428/31909; Y10T428/31913; Y10T428/3192
Claims Analysis
Total Claims: 81
Claim 1
Independent Claim
58 words
A multiple layer film having two outer surfaces, said film having first and second layers, in surface-to-surface contact with each other, said film having a weld line, said weld line extending, in a single, unbroken path, through said first and second layers, said weld line, comprising said single, unbroken path, extending to, and intersecting, both said outer surfaces.
Claim 2
Dependent Claim
58 words
A multiple layer film having two outer surfaces, said film having first and second layers, in surface-to-surface contact with each other, said film having a weld line, said weld line extending, in a single, unbroken path, through said first and second layers, said weld line, comprising said single, unbroken path, extending to, and intersecting, both said outer surfaces.
Claim 3
Dependent Claim
107 words
A multiple layer film having a first layer, said first layer having a first pair of opposing surface, a second layer on an outwardly disposed one of said opposing surfaces, and a third layer, said second layer being between said first layer and said third layer, said third layer having a second pair of opposing surfaces, said film comprising a weld line extending through said first and second layers at an angle greater than 45 degrees to said surfaces, said third layer being devoid of any weld line which is diposed at an angle greater than 45 degrees to either surfaces of said second pair of surface.
Claim 4
Dependent Claim
107 words
A multiple layer film having a first layer, said first layer having a first pair of opposing surface, a second layer on an outwardly disposed one of said opposing surfaces, and a third layer, said second layer being between said first layer and said third layer, said third layer having a second pair of opposing surfaces, said film comprising a weld line extending through said first and second layers at an angle greater than 45 degrees to said surfaces, said third layer being devoid of any weld line which is diposed at an angle greater than 45 degrees to either surfaces of said second pair of surface.
Claim 5
Dependent Claim
45 words
A multiple layer film as in claim 2 and including a fourth layer on the other one of said first pair of opposing surfaces of said first layer, said weld line extending through said first and second layers, and further extending through said fourth layer.
Claim 6
Dependent Claim
37 words
A multiple layer film as in claim 2, said first layer comprising vinylidene chloride copolymer, said second and third layers being essentially free from vinylidene chloride copolymer and comprising compositions compatible with coextrusion with vinylidene chloride copolymer.
Claim 7
Dependent Claim
38 words
A multiple layer film as in claim 3, said first layer comprising vinylidene chloride copolymer, said second and third layers being essentially free from vinylidene chloride copolymer and comprising polymeric compositions compatible with coextrusion with vinylidene chloride copolymer.
Claim 8
Dependent Claim
79 words
A multiple layer film as in claim 2 and including a fourth layer on the other one of said first pair of opposing surfaces of said first layer, said fourth layer having a third pair of opposing surfaces and being devoid of any weld line which is (i) disposed at a minimum angle greater than 45 degrees from said third pair of surfaces and (ii) located within 2 centimeters of said weld line through said first and second layers.
Claim 9
Dependent Claim
11 words
A package made with a multiple layer film of claim 2.
Claim 10
Dependent Claim
11 words
A package made with a multiple layer film of claim 3.
Claim 11
Dependent Claim
11 words
a package made with a multiple layer film of claim 6.
Claim 12
Dependent Claim
11 words
A package made with a multiple layer film of claim 4.
Claim 13
Dependent Claim
11 words
A package made with a multiple layer film of claim 5.
Claim 14
Dependent Claim
38 words
A multiple layer film as in claim 6, said first layer comprising vinylidene chloride compolymer, said second and third layers being essentially free from vinylidene chloride copolymer and comprising polymeric compositions compatible with coextrusion with vinylidene chloride copolymer.
Claim 15
Dependent Claim
11 words
A package made with a multiple layer film of claim 12.
Claim 16
Dependent Claim
90 words
A multiple layer film having a first layer, said first layer having a first pair of opposing surfaces, and a second layer on a respective one of said opposing surfaces, said film comprising a weld line extending through said first and second layers at an angle greater than 45 degrees to said surfaces, and including a third layer on the other of said first pair of opposing surfaces, said second and third layers being essentially free from vinylidene chloride copolymer and comprising compositions compatible with coextrusion of vinylidene chloride copolymer.
Claim 17
Dependent Claim
90 words
A multiple layer film having a first layer, said first layer having a first pair of opposing surfaces, and a second layer on a respective one of said opposing surfaces, said film comprising a weld line extending through said first and second layers at an angle greater than 45 degrees to said surfaces, and including a third layer on the other of said first pair of opposing surfaces, said second and third layers being essentially free from vinylidene chloride copolymer and comprising compositions compatible with coextrusion of vinylidene chloride copolymer.
Claim 18
Dependent Claim
11 words
A package made with a multiple layer film of claim 14.
Claim 19
Dependent Claim
28 words
A multiple layer film as in claim 14, said weld line extending, from said first layer, into and through said third layer, in a continuation of said path.
Claim 20
Dependent Claim
71 words
A multiple layer film as in claim 16, and including a fourth layer, said third layer being between said first and fourth layers, said fourth layer being devoid of any weld line which (i) is disposed at an angle greater than 45 degrees to either surface of said second pair of surfaces and (ii) is located within 2 centimeters of said weld line extending through said first, second and third layers.
Claim 21
Dependent Claim
89 words
A multiple layer film having a first layer, said first layer having a first pair of opposing surfaces, and a second layer on a respective one of said opposing surfaces, said film comprising a weld line extending through said first and second layers at an angle greater than 45 degrees to said surfaces, said film further comprising a third layer on the other one of said first pair of opposing surfaces, said first layer comprising a vinylidene chlordie copolymer, said second and third layers comprising ethylene vinyl acetate copolymer.
Claim 22
Dependent Claim
89 words
A multiple layer film having a first layer, said first layer having a first pair of opposing surfaces, and a second layer on a respective one of said opposing surfaces, said film comprising a weld line extending through said first and second layers at an angle greater than 45 degrees to said surfaces, said film further comprising a third layer on the other one of said first pair of opposing surfaces, said first layer comprising a vinylidene chlordie copolymer, said second and third layers comprising ethylene vinyl acetate copolymer.
Claim 23
Dependent Claim
95 words
A multiple layer film as in claim 18, said second layer being disposed outwardly of said first layer in said film, and including a fourth polymeric layer, said second layer being between said first layer and said fourth layer, said fourth layer having a second pair of opposing surfaces, said fourth layer being devoid of any weld line which is (i) disposed at an angle greater than 45 degrees to either surface of said second pair of surfaces and (ii) located within 2 centimeters of said weld line through said second, first, and third layers.
Claim 24
Dependent Claim
58 words
A multiple layer film as in claim 18 and includig fourth and fifth layers, respectively, on opposing surfaces of said second and third layers, the compositions of said fourth and fifth layers being selected from the group consisting of linear low density polyethylene, propylene polymers and copolymers, ethylene polymers and copolymers, ionomers, and vinyl alcohol polymers and copolymers.
Claim 25
Dependent Claim
18 words
A multiple layer film as in claim 20, said fourth and fifth layers comprising linear low density polyehylene.
Claim 26
Dependent Claim
11 words
A package made with a multiple layer film of claim 18.
Claim 27
Dependent Claim
11 words
A package made with a multiple layer film of claim 19.
Claim 28
Dependent Claim
11 words
A package made with a multiple layer film of claim 20.
Claim 29
Dependent Claim
11 words
A package made with a multiple layer film of claim 21.
Claim 30
Dependent Claim
28 words
A multiple layer film as in claim 18, said weld line extending, from said first layer, into and through said third layer, in a continuation of said path.
Claim 31
Dependent Claim
166 words
A multiple layer film having a first layer, said first layer having a first pair of opposing surfaces, and a second layer on an outwardly disposed one of said opposing surfaces, said seond layer having a second pair of opposing surfaces, said film comprising a weld line extending sequentially through said first and second layers, said weld line defining a continuous path through said first and second layers, when projected to one of said surfaces on the respective one of said layers, defining an angle of greater than 45 degrees with said surface, and including a third layer, said second layer being between said first layer and said third layer, said third layer having a third pair of opposing surfaces, said third layer being devoid of any weld line which (i) is disposed at an angle greater than 45 degrees to either surface of said second pair of surfaces and (ii) is located within 2 centimeters of said weld line through said first and second layers.
Claim 32
Dependent Claim
166 words
A multiple layer film having a first layer, said first layer having a first pair of opposing surfaces, and a second layer on an outwardly disposed one of said opposing surfaces, said seond layer having a second pair of opposing surfaces, said film comprising a weld line extending sequentially through said first and second layers, said weld line defining a continuous path through said first and second layers, when projected to one of said surfaces on the respective one of said layers, defining an angle of greater than 45 degrees with said surface, and including a third layer, said second layer being between said first layer and said third layer, said third layer having a third pair of opposing surfaces, said third layer being devoid of any weld line which (i) is disposed at an angle greater than 45 degrees to either surface of said second pair of surfaces and (ii) is located within 2 centimeters of said weld line through said first and second layers.
Claim 33
Dependent Claim
45 words
A multiple layer film as in claim 27 and including a fourth layer on the other one of said first pair of opposing surface of said first layer, said weld line extending through said first and second layers, and further extending through said fourth layer.
Claim 34
Dependent Claim
37 words
A multiple layer film as in claim 27, said first layer comprising vinylidene chloride copolymer, said second and third layers being essentially free from vinylidene chloride compolymer and comprising compositions compatible with coextrusion with vinylidene chloride copolymer.
Claim 35
Dependent Claim
35 words
A multiple layer film as in claim 28, said first layer comprising vinylidene chloride copolymer, said second and third layers being essentially free from vinylidene chloride copolymer and comprising compositions compatible with vinylidene chloride copolymer.
Claim 36
Dependent Claim
142 words
A multiple layer film having a first layer, said first layer having a first pair of opposing surfaces, and a second layer on a respective one of said opposing surfaces, said second layer having a second pair of opposing surfaces, said film comprising a weld line extending sequentially through said first and second layers, said weld line defining a continuous path through said first and second layers, each portion of said path in said first and second layers, where projected to one of said surfaces on the respective one of said layers, defining an angle of greater than 45 degrees with said surface, said film including a third layer on the othe of said first pair of opposing surfaces, said second and third layers being essentially free from vinylidene chloride copolymer and comprising polymeric compositions compatible with coextrusion with vinylidene chloride copolymer.
Claim 37
Dependent Claim
142 words
A multiple layer film having a first layer, said first layer having a first pair of opposing surfaces, and a second layer on a respective one of said opposing surfaces, said second layer having a second pair of opposing surfaces, said film comprising a weld line extending sequentially through said first and second layers, said weld line defining a continuous path through said first and second layers, each portion of said path in said first and second layers, where projected to one of said surfaces on the respective one of said layers, defining an angle of greater than 45 degrees with said surface, said film including a third layer on the othe of said first pair of opposing surfaces, said second and third layers being essentially free from vinylidene chloride copolymer and comprising polymeric compositions compatible with coextrusion with vinylidene chloride copolymer.
Claim 38
Dependent Claim
28 words
A multiple layer film as in claim 31, said weld line extending, from said first layer, into and through said third layer, in a continuation of said path.
Claim 39
Dependent Claim
70 words
A multiple layer film as in claim 32, and including a fourth layer, said third layer being between said first and fourth layers, said fourth layer being devoid of any weld line which is (i) disposed at an angle greater than 45 degrees to either surface of said second pair of surfaces and (ii) located within 2 centimeters of said weld line extending through said first, second, and third layers.
Claim 40
Dependent Claim
139 words
A multiple layer film havig a first layer, said first layer having a first pair of opposing surfaces, and a second layer on a respective one of said opposing surfaces, said second layer having a second pair of opposing surfaces, said film comprising a weld line extending sequentially through said first and second layers, said weld line defining a continuous path through said first and second layers, each portion of said path in said first and second layers, when projected to one of said surfaces on the respective one of said layers, defining an angle of greater than 45 degrees with said surface, said film further comprising a third layer on the other one of said first pair of opposing surfaces, said firt layer comprising a vinylidene chloride copolymer, said second and third layers comprising ethylene vinyl acetate copolymer.
Claim 41
Dependent Claim
139 words
A multiple layer film havig a first layer, said first layer having a first pair of opposing surfaces, and a second layer on a respective one of said opposing surfaces, said second layer having a second pair of opposing surfaces, said film comprising a weld line extending sequentially through said first and second layers, said weld line defining a continuous path through said first and second layers, each portion of said path in said first and second layers, when projected to one of said surfaces on the respective one of said layers, defining an angle of greater than 45 degrees with said surface, said film further comprising a third layer on the other one of said first pair of opposing surfaces, said firt layer comprising a vinylidene chloride copolymer, said second and third layers comprising ethylene vinyl acetate copolymer.
Claim 42
Dependent Claim
94 words
A multiple layer film as in claim 34, said second layer being disposed outwardly of said first layer in said film, and including a fourth layer, said second layer being between said first layer and said fourth layer, said fourth layer having a third pair of opposing surfaces, said fourth layer being devoid of any weld line which is (i) disposed at an angle greater than 45 degrees to either surface of said third pair of surfaces and (ii) located within 2 centimeters of said weld line through said second, first, and third layers.
Claim 43
Dependent Claim
58 words
A multiple layer film as in claim 34 and including fourth and fifth layers, respectively, on opposing surfaces of said second and third layers, the compositions of said fourth and fifth layers being selected from the group consisting of linear low density polyethylene, propylene polymers and copolymers, ethylene polymers and copolymers, iononmers, and vinyl alcohol polymers and copolymers.
Claim 44
Dependent Claim
28 words
A multiple layer films as in claim 34, said weld line extending, from said first layer, into and through said third layer, in a continuation of said path.
Claim 45
Dependent Claim
210 words
A multiple layer tubular film having a first layer, said first layer having a first pair of opposing surfaces, and a second layer on a respective one of said opposing surfaces, said first and second layers having corresponding first and second pairs of edges, said first pair of edges meeting in direct contact with each other at a longitudinal weld line in said tubular film, said weld line defining a first surface of contact between said first pair of edges, said second pair of edges meeting in direct contact with each other at said longitudinal weld line, said weld line defining a second surface of contact between said second pair of edges, said weld line extending through said first and second layers in a continuous path comprising said first and second surfaces of contact, said second layer being disposed outwardly of said first layer in said film, and including a third layer, said second layer being between said first layer and said third layer, said third layer being devoid of any weld line which (i) is disposed at an angle greater than 45 degrees to either surface of said second pair of surfaces and (ii) is located within 2 centimeters of said weld line through said first and second layers.
Claim 46
Dependent Claim
210 words
A multiple layer tubular film having a first layer, said first layer having a first pair of opposing surfaces, and a second layer on a respective one of said opposing surfaces, said first and second layers having corresponding first and second pairs of edges, said first pair of edges meeting in direct contact with each other at a longitudinal weld line in said tubular film, said weld line defining a first surface of contact between said first pair of edges, said second pair of edges meeting in direct contact with each other at said longitudinal weld line, said weld line defining a second surface of contact between said second pair of edges, said weld line extending through said first and second layers in a continuous path comprising said first and second surfaces of contact, said second layer being disposed outwardly of said first layer in said film, and including a third layer, said second layer being between said first layer and said third layer, said third layer being devoid of any weld line which (i) is disposed at an angle greater than 45 degrees to either surface of said second pair of surfaces and (ii) is located within 2 centimeters of said weld line through said first and second layers.
Claim 47
Dependent Claim
45 words
A multiple layer film as in claim 38 and including a fourth layer on the other one of said first pair of opposing surfaces of said first layer, said weld line extending through said first and second layers, and further extending through said fourth layer.
Claim 48
Dependent Claim
38 words
A multiple layer tubular film as in claim 38, said first layer comprising vinylidene chloride copolymers, said second and third layers being essentially free from vinylidene chloride copolymer and comprising compositions compatible with coextrusion with vinylidene chloride copolymer.
Claim 49
Dependent Claim
39 words
A multiple layer tubular film as in claim 39, said first layer comprising vinylidene chloride copolymer, said second and third layers being essentially free from vinylidene chloride copolymer and comprising polymeric compositions compatible with coextrusion with vinylidene chloride copolymer.
Claim 50
Dependent Claim
171 words
A multiple layer tubular film having a first layer, said first layer having a first pair of opposig surfaces, and a second layer on a respective one of said opposing surfaces, said first and second layers having corresponding first and second pairs of edges, said first pair of edges meeting in direct contact with each other at a longitudinal weld line in said tubular film, said weld line defining a first surface of contact between said first pair of edges, said second pair of edges meeting in direct contact with each other at said longitudinal weld line, said weld line defining a second surface of contact between said second pair of edges, said weld line extending through said first and second layers in a continuous path comprising said first and second surfaces of contact, and including a third layer on the other of said first pair of opposing surfaces, said second and third layers being essentially free from vinylidene chloride copolymer and comprising compositions compatible with coextrusion with vinylidene chloride copolymer.
Claim 51
Dependent Claim
171 words
A multiple layer tubular film having a first layer, said first layer having a first pair of opposig surfaces, and a second layer on a respective one of said opposing surfaces, said first and second layers having corresponding first and second pairs of edges, said first pair of edges meeting in direct contact with each other at a longitudinal weld line in said tubular film, said weld line defining a first surface of contact between said first pair of edges, said second pair of edges meeting in direct contact with each other at said longitudinal weld line, said weld line defining a second surface of contact between said second pair of edges, said weld line extending through said first and second layers in a continuous path comprising said first and second surfaces of contact, and including a third layer on the other of said first pair of opposing surfaces, said second and third layers being essentially free from vinylidene chloride copolymer and comprising compositions compatible with coextrusion with vinylidene chloride copolymer.
Claim 52
Dependent Claim
28 words
A multiple layer film as in claim 42, said weld line extending, from said first layer, into and through said third layer, in a continuation of said path.
Claim 53
Dependent Claim
70 words
A multiple layer film as in claim 43, and including a fourth layer, said third layer being between said first and fourth layers, said fourth layer being devoid of any weld line which is (i) disposed at an angle greater than 45 degrees to either surface of said second pair of surfaces and (ii) located within 2 centimeters of said weld line extending through said first, second, and third layers.
Claim 54
Dependent Claim
170 words
A multiple layer tubular film having a first layer, said first layer having a first pair of opposing surface, and a second layer on a respective one of said opposing surfaces, said first and second layers having corresponding first and second pairs of edges, said first pair of edges meeting in direct contact with each other at a longitudinal weld line in said tubular film, said weld line defining a first surface of contact between said first pair of edges, said second pair of edges meeting in direct contact with each other at said longitudinal weld line, said weld line defining a second surface of contact between said second pair of edges, said weld line extending through said first and second layers in a continuous path comprising said first and second surfaces of contact, said film further comprising a third layer on the other one of said first pair of opposing surfaces, said first layer comprising a vinylidene chloride copolymer, said second and third layers comprising ethylene vinyl acetate copolymer.
Claim 55
Dependent Claim
170 words
A multiple layer tubular film having a first layer, said first layer having a first pair of opposing surface, and a second layer on a respective one of said opposing surfaces, said first and second layers having corresponding first and second pairs of edges, said first pair of edges meeting in direct contact with each other at a longitudinal weld line in said tubular film, said weld line defining a first surface of contact between said first pair of edges, said second pair of edges meeting in direct contact with each other at said longitudinal weld line, said weld line defining a second surface of contact between said second pair of edges, said weld line extending through said first and second layers in a continuous path comprising said first and second surfaces of contact, said film further comprising a third layer on the other one of said first pair of opposing surfaces, said first layer comprising a vinylidene chloride copolymer, said second and third layers comprising ethylene vinyl acetate copolymer.
Claim 56
Dependent Claim
96 words
A multiple layer tubular film as in claim 45, said second layer being disposed outwardly of said first layer in said film, and including a fourth polymeric layer, said second layer being between said first layer and said fourth layer, said fourth layer having a second pair of opposing surfaces, said fourth layer being devoid of any weld line which is (i) disposed at an angle greater than 45 degrees to either surface of said second pair of surfaces and (ii) located within 2 centimeters of said weld line through said secod, first, and third layers.
Claim 57
Dependent Claim
28 words
A multiple layer film as in claim 45, said weld line extending, from said first layer, into and through said third layer, in a continuation of said path.
Claim 58
Dependent Claim
77 words
A multiple layer tubular film having a first layer comprising vinylidene chloride copolymer, said first layer having a first pair of opposing surfaces, and a second layer on a respective one of said opposing surfaces, said first layer havig a pair of edges, said pair of edges meeting in direct contact with each other at a longitudinal weld line in said tubular film, said weld line extending through said first and second layers in a continuous path.
Claim 59
Dependent Claim
77 words
A multiple layer tubular film having a first layer comprising vinylidene chloride copolymer, said first layer having a first pair of opposing surfaces, and a second layer on a respective one of said opposing surfaces, said first layer havig a pair of edges, said pair of edges meeting in direct contact with each other at a longitudinal weld line in said tubular film, said weld line extending through said first and second layers in a continuous path.
Claim 60
Dependent Claim
95 words
A multiple layer tubular film as in claim 48, said second layer being disposed outwardly of said first layer in said film, and including a third layer, said second layer being between said first layer and said third layer, said third layer having a second pair of opposing surfaces, said third layer being devoid of any weld line which (i) is disposed at an angle greater than 45 degrees to either surface of said second pair of surfaces and (ii) is located within 2 centimeters of said weld line through said first and second layers.
Claim 61
Dependent Claim
45 words
A multiple layer film as in claim 49 and including a fourth layer on the other one of said first pair of opposing surfaces of said first layer, said weld line extending through said first and second layers, and further extending through said fourth layer.
Claim 62
Dependent Claim
46 words
A multiple layer tubular film as in claim 48, and including a third layer on the other of said first pair of opposing surfaces, said second and third layers being essentially free from vinylidene chloride copolymer and comprising compositions compatible with coextrusion with vinylidene chloride copolymer.
Claim 63
Dependent Claim
32 words
A multiple layer tubular film as in claim 49, said second and third layers being essentially free from vinylidene chloride copolymer and comprising polymeric compositions comaptible with coextrusion with vinylidene chloride copolymer.
Claim 64
Dependent Claim
32 words
A multiple layer tubular film as in claim 50, said second and third layers being essentially free from vinylidene chloride copolymer and comprising polymeric compositions compatible with coextrusion with vinylidene chloride copolymer.
Claim 65
Dependent Claim
37 words
A multiple layer tubular film as in claim 48, said film further comprising a third layer on the other one of said first pair of opposing surface, said second and third layers comprising ethylene vinyl acetate copolymer.
Claim 66
Dependent Claim
97 words
A multiple layer tubular film as in claim 54, said second layer being disposed outwardly of said first layer in said film, and including a fourth polymeric layer, said second layer being between said first layer and said fourth layer, said fourth layer having a second pair of a opposing surfaces, said fourth layer being devoid of any weld line which is (i) disposed at an angle greater than 45 degrees to either surface of said second pair of surfaces and (ii) located within 2 centimeters of said weld line through said second, first, and third layers.
Claim 67
Dependent Claim
28 words
A multiple layer film as in claim 51, said weld line extending, from said first layer, into and through said third layer, in a continuation of said path.
Claim 68
Dependent Claim
28 words
A multiple layer film as in claim 54, said weld line extending, from said first layer, into and through said third layer, in a continuation of said path.
Claim 69
Dependent Claim
70 words
A multiple layer film as in claim 56, and including a fourth layer, said third layer being between said first and fourth layer, said fourth layer being devoid of any weld line which is (i) disposed at an angle greater than 45 degrees to either surface of said second pair of surfaces and (ii) located within 2 centimeters of said weld line extending through said first, second, and third layers.
Claim 70
Dependent Claim
19 words
A film in claim 48, said weld line defining a surface of contact between said first pair of edges.
Claim 71
Dependent Claim
109 words
A tubular film comprising at least one layer of vinylidene chloride copolymer, said film being molecularly unoriented beyond that orientation which is sustained in a film-forming extrusion process, and having a circumference of at least 85 centimeters, said film comprising first and second layers, said film comprising no seams and no joints along the longitudinal direction thereof, said film further comprising a longitudinal extending weld line, said weld line defining a continuous path through said first and second layers, each portion of said path in said first and second layers, when projected to a surface of said film, defining an angle of greater than 45 degrees with said surface.
Claim 72
Dependent Claim
109 words
A tubular film comprising at least one layer of vinylidene chloride copolymer, said film being molecularly unoriented beyond that orientation which is sustained in a film-forming extrusion process, and having a circumference of at least 85 centimeters, said film comprising first and second layers, said film comprising no seams and no joints along the longitudinal direction thereof, said film further comprising a longitudinal extending weld line, said weld line defining a continuous path through said first and second layers, each portion of said path in said first and second layers, when projected to a surface of said film, defining an angle of greater than 45 degrees with said surface.
Claim 73
Dependent Claim
32 words
A tubular film as in claim 60, said film being unoriented beyond that orientation which is sustained in a film forming extrusion process, and having a circumference of at least 100 centimeters.
Claim 74
Dependent Claim
17 words
A tubular film as in claim 61, said film having a circumference of at least 140 centimeters.
Claim 75
Dependent Claim
11 words
A package made with a multiple layer film of claim 1.
Claim 76
Dependent Claim
32 words
A film comprising at least one layer of vinylidene chloride copolymer, said film having been fabricated in an extrusion process using a tubular die having a circumference of at least 85 centimeters.
Claim 77
Dependent Claim
32 words
A film comprising at least one layer of vinylidene chloride copolymer, said film having been fabricated in an extrusion process using a tubular die having a circumference of at least 85 centimeters.
Claim 78
Dependent Claim
27 words
A film as in claim 64, said film having been fabricated in an extrusion process using a tubular die having a circumference of at least 90 centimeters.
Claim 79
Dependent Claim
27 words
A film as in claim 64, said film having been fabricated in an extrusion process using a tubular die having a circumference of at least 100 centimeters.
Claim 80
Dependent Claim
27 words
A film as in claim 64, said film having been fabricated in an extrusion process using a tubular die having a circumference of at least 140 centimeters.
Claim 81
Dependent Claim
24 words
A package made with a multiple layer film of any one of claims 16, 26, 27, 33, 38, 50, 60, 62, 59, and 64-67.
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US4842791A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-07-30 | 1994-01-29 | 1994-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-07-30 | 1998-01-29 | 1998-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-07-30 | 2002-01-29 | 2002-07-31 | $7700.00 | Window Closed / Lapsed |