US4791965A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Co-extruded tube
Assignee: Toro Co
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Filing: 1987-02-13
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Granted: 1988-12-20
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Expires: 2007-02-13
Abstract
Abstract A tube having an elongated core composed of a flexible narrow molecular weight distribution first polymeric composition, a sheath composed of a broader molecular weight second polymeric composition co-extruded over the outer core surface, and a liner composed of a broader molecular weight distribution second polymeric composition co-extruded over the inner core surface. The core may be composed of a composition exhibiting relative poor processability, and the sheath and liner of a composition exhibiting better processability.
Inventors
- 👤 Gerald E. Wynn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:30
CPC Classifications
F; F16; F16L; F16L9/00; F16L9/12; F16L9/121; B; B29; B29C; B29C48/00; B29C48/03; B29C48/09; B29C48/16; B29C48/18; B29C48/21; B29C48/25; B29C48/30; B29C48/32; B29C48/335
Claims Analysis
Total Claims: 39
Claim 1
Independent Claim
89 words
A tube, comprising: an elongated, tubular core composed of a first polymeric composition, the core having an outer core surface and an inner core surface; and a sheath disposed over the outer core surface and a liner disposed over the inner core surface, at least one of which sheath and liner is composed of a second polymeric composition having broader molecular weight distribution than the first polymeric composition, provided that said core comprises at least about 94% of the total volume of said core, said sheath and said liner.
Claim 2
Dependent Claim
89 words
A tube, comprising: an elongated, tubular core composed of a first polymeric composition, the core having an outer core surface and an inner core surface; and a sheath disposed over the outer core surface and a liner disposed over the inner core surface, at least one of which sheath and liner is composed of a second polymeric composition having broader molecular weight distribution than the first polymeric composition, provided that said core comprises at least about 94% of the total volume of said core, said sheath and said liner.
Claim 3
Dependent Claim
19 words
The tube of claim 1, wherein: both the sheath and the liner are composed of the second polymeric composition.
Claim 4
Dependent Claim
19 words
The tube of claim 1 which is formed by co-extrusion of the first polymeric composition and second polymeric composition.
Claim 5
Dependent Claim
25 words
The tube of claim 1, wherein: the first polymeric composition and second polymeric composition are selected from the group consisting of polyolefins and mixtures thereof.
Claim 6
Dependent Claim
25 words
The tube of claim 1, wherein: said core comprises at least about 99% of the total volume of said core, said sheath and said liner.
Claim 7
Dependent Claim
36 words
The tube of claim 1, wherein: the first polymeric composition is selected from the group consisting of homopolymers of olefins containing 2 to about 8 carbon atoms per molecule, copolymers of such olefins and mixtures thereof.
Claim 8
Dependent Claim
26 words
The tube of claim 6, wherein: the copolymers are derived from ethylene and at least one olefin containing 3 to about 8 carbon atoms per molecule.
Claim 9
Dependent Claim
32 words
The tube of claim 1, wherein: the second polymeric composition is selected from the group consisting of homopolymers of olefins containing 2 to about 8 carbon atoms per molecule, and mixtures thereof.
Claim 10
Dependent Claim
18 words
The tube of claim 1, wherein: the sheath and the liner are comprised of different second polymeric compositions.
Claim 11
Dependent Claim
93 words
A tube, comprising: an elongated, tubular core composed of a first polymeric composition, the core having an outer core surface and in inner core surface; and a sheath disposed over the outer core surface and a liner disposed over the inner core surface, at least one of which sheath and liner is composed of a second polymeric composition which is linear and has a broader molecular weight distribution than the first polymeric composition, provided that said core comprises at least 94% of the total volume of said core, said sheath and said liner.
Claim 12
Dependent Claim
93 words
A tube, comprising: an elongated, tubular core composed of a first polymeric composition, the core having an outer core surface and in inner core surface; and a sheath disposed over the outer core surface and a liner disposed over the inner core surface, at least one of which sheath and liner is composed of a second polymeric composition which is linear and has a broader molecular weight distribution than the first polymeric composition, provided that said core comprises at least 94% of the total volume of said core, said sheath and said liner.
Claim 13
Dependent Claim
73 words
A tube, comprising: an elongated, tubular core composed of a first polymeric composition, the core having an outer core surface and an inner core surface; and a sheath disposed over the outer core surface and a liner disposed over the inner core surface, at least one of which sheath and liner consist essentially of a second polymeric composition which is linear and has a broader molecular weight distribution than the first polymeric composition.
Claim 14
Dependent Claim
73 words
A tube, comprising: an elongated, tubular core composed of a first polymeric composition, the core having an outer core surface and an inner core surface; and a sheath disposed over the outer core surface and a liner disposed over the inner core surface, at least one of which sheath and liner consist essentially of a second polymeric composition which is linear and has a broader molecular weight distribution than the first polymeric composition.
Claim 15
Dependent Claim
19 words
The tube of claim 11, wherein: both the sheath and the liner consist essentially of the second polymeric composition.
Claim 16
Dependent Claim
20 words
The tube of claim 11 which is formed by co-extrusion of the first polymeric composition and the second polymeric composition.
Claim 17
Dependent Claim
26 words
The tube of claim 11 wherein: the first polymeric composition and the second polymeric composition are selected from the group consisting of polyolefins and mixtures thereof.
Claim 18
Dependent Claim
25 words
The tube of claim 11 wherein: the molecular weight distribution of the first polymeric composition is in the range of about 2 to about 6.
Claim 19
Dependent Claim
25 words
The tube of claim 11 wherein: the molecular weight distribution of the first polymeric composition is in the range of about 2.5 to about 4.5.
Claim 20
Dependent Claim
36 words
The tube of claim 11 wherein: the first polymeric composition is selected from the group consisting of homopolymers of olefins containing 2 to about 8 carbon atoms per molecule, copolymers of such olefins and mixtures thereof.
Claim 21
Dependent Claim
26 words
The tube of claim 11 wherein: the copolymers are derived from ethylene and at least one olefin containing 3 to about 8 carbon atoms per molecule.
Claim 22
Dependent Claim
36 words
The tube of claim 11 wherein: the second polymeric composition is selected from the group consisting of homopolymers of olefins containing 2 to about 8 carbon atoms per molecule, copolymers of such olefins and mixtures thereof.
Claim 23
Dependent Claim
18 words
The tube of claim 11 wherein: the sheath and the liner consist essentially of different second polymeric compositions.
Claim 24
Dependent Claim
94 words
A tube, comprising: an elongated, tubular core composed of a first polymeric composition, the core having an outer core surface and an inner core surface; and a sheath disposed over the outer core surface and a liner disposed over the inner core surface, at least one of which sheath and liner consists essentially of a second polymeric composition which is linear and has a broader molecular weight distribution than the first polymeric composition, provided that said core comprises at least about 99% of the total volume of said core, said sheath and said liner.
Claim 25
Dependent Claim
94 words
A tube, comprising: an elongated, tubular core composed of a first polymeric composition, the core having an outer core surface and an inner core surface; and a sheath disposed over the outer core surface and a liner disposed over the inner core surface, at least one of which sheath and liner consists essentially of a second polymeric composition which is linear and has a broader molecular weight distribution than the first polymeric composition, provided that said core comprises at least about 99% of the total volume of said core, said sheath and said liner.
Claim 26
Independent Claim
102 words
A method of decreasing tube flow resistance while improving tube appearance, comprising: forming a tubular core composed of a first polymeric composition having a relatively narrow molecular weight distribution; and forming a sheath and a linear over respective ones of an outer surface of the core and an inner surface of the core so that at least one of the sheath and the linear are composed of a polymeric composition having a broader molecular weight distribution than the first polymeric composition, provided that said core comprises at least about 94% of the total volume of said core, said sheath and said liner.
Claim 27
Independent Claim
102 words
A method of decreasing tube flow resistance while improving tube appearance, comprising: forming a tubular core composed of a first polymeric composition having a relatively narrow molecular weight distribution; and forming a sheath and a linear over respective ones of an outer surface of the core and an inner surface of the core so that at least one of the sheath and the linear are composed of a polymeric composition having a broader molecular weight distribution than the first polymeric composition, provided that said core comprises at least about 94% of the total volume of said core, said sheath and said liner.
Claim 28
Dependent Claim
17 words
A method as recited in claim 22, further comprising: co-extruding the core, the sheath, and the liner.
Claim 29
Dependent Claim
30 words
A method as recited in claim 23, wherein the step of co-extruding includes; co-extruding the core, the sheath, and the liner so that the resulting tube is substantially fracture free.
Claim 30
Independent Claim
84 words
A method of fabricating a tube, comprising: forming a core having desired tubing characteristics from a first composition exhibiting relatively poor processability; and forming a sheath over an outer surface of the core from a second composition and a liner over an inner surface of the core from a third composition, at least one of which second and third compositions exhibit better processability, provided that said core comprises at least about 94% of the total volume of said core, said sheath and said liner.
Claim 31
Independent Claim
84 words
A method of fabricating a tube, comprising: forming a core having desired tubing characteristics from a first composition exhibiting relatively poor processability; and forming a sheath over an outer surface of the core from a second composition and a liner over an inner surface of the core from a third composition, at least one of which second and third compositions exhibit better processability, provided that said core comprises at least about 94% of the total volume of said core, said sheath and said liner.
Claim 32
Dependent Claim
49 words
A method as recited in claim 25, wherein: the first composition is a first polymeric composition having a relatively narrow molecular weight distribution; and at least one of the second and third compositions is a second polymeric composition having a broader molecular weight distribution than the first polymeric composition.
Claim 33
Independent Claim
106 words
A method of decreasing tube flow resistance while improving tube appearance, comprising: forming a tubular core composed of a first polymeric composition having a relatively narrow molecular weight distribution; and forming a sheath and a liner over respective over of an outer surface of the core and an inner surface of the core so that at least one of the sheath and the liner consists essentially or a second polymeric composition which is linear and has broader molecular weight distribution than the first polymeric composition, provided that said core comprises at least about 99% of the total volume of said core, said sheath and said liner.
Claim 34
Independent Claim
106 words
A method of decreasing tube flow resistance while improving tube appearance, comprising: forming a tubular core composed of a first polymeric composition having a relatively narrow molecular weight distribution; and forming a sheath and a liner over respective over of an outer surface of the core and an inner surface of the core so that at least one of the sheath and the liner consists essentially or a second polymeric composition which is linear and has broader molecular weight distribution than the first polymeric composition, provided that said core comprises at least about 99% of the total volume of said core, said sheath and said liner.
Claim 35
Dependent Claim
17 words
A method as recited in claim 27, further comprising: co-extruding the core, the sheath, and the liner.
Claim 36
Dependent Claim
30 words
A method as recited in claim 28, wherein the step of co-extruding includes: co-extruding the core, the sheath, and the liner so that the resulting tube is substantially fracture free.
Claim 37
Independent Claim
74 words
A method of fabricating a tube, comprising: forming a core having desired tubing characteristics from a first polymeric composition exhibiting relatively poor processability; and forming a sheath over an outer surface of the core consisting essentially of a second polymeric composition and a liner over an inner surface of the core consisting essentially of a third polymeric composition, at least one of which second and third polymeric compositions is linear and exhibits better processability.
Claim 38
Independent Claim
74 words
A method of fabricating a tube, comprising: forming a core having desired tubing characteristics from a first polymeric composition exhibiting relatively poor processability; and forming a sheath over an outer surface of the core consisting essentially of a second polymeric composition and a liner over an inner surface of the core consisting essentially of a third polymeric composition, at least one of which second and third polymeric compositions is linear and exhibits better processability.
Claim 39
Dependent Claim
41 words
A method as recited in claim 30, wherein: the first polymeric composition has a relatively narrow molecular weight distribution; and at least one of the second and third polymeric compositions has a broader molecular weight distribution than the first polymer composition.
References Cited (Backward Citations)
US3271477A
Cited
US3561493A
Cited
US3411981A
Cited
US3741253A
Cited
US3718161A
Cited
US3904111A
Cited
US4101699A
Cited
US4018250A
Cited
US4097569A
Cited
US4243074A
Cited
US4364981A
Cited
US4348349A
Cited
US4523970A
Cited
US4705829A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-12-20 | 1992-06-20 | 1992-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-12-20 | 1996-06-20 | 1996-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-12-20 | 2000-06-20 | 2000-12-20 | $7700.00 | Window Closed / Lapsed |