Patent US2502171A successfully refreshed from Google Patents.
US4579771A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Laminated spiral mesh papermakers fabric
Assignee: Asten Inc
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Filing: 1985-07-08
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Granted: 1986-04-01
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Expires: 2005-07-08
Abstract
Abstract The present invention relates to multilayer papermakers fabric having an upper layer comprised of an upper layer and an under layer comprised of a plurality of intermeshed monofilament spiral coils, retained by pintle means; the upper and lower layers having different permeabilities and being unified into a single fabric by application of adhesives to the interface between the upper layer and the under layer.
Inventors
- 👤 William A. Finn
- 👤 Harry I. Searfass
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:48
CPC Classifications
D; D21; D21F; D21F1/00; D21F1/0027; D21F1/0036; D21F1/0063; D21F1/0072; D21F7/00; D21F7/08; D21F7/083; Y; Y10; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249922
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
83 words
An improved multilayer papermakers fabric of the type having an under layer of interconnected synthetic monofilament yarns and an upper layer, said under layer and upper layer being retained in a single fabric by adhesive means, the improvement characterized by: said under layer being comprised of a plurality of intermeshed synthetic monofilament spiral strips which are retained in that relationship by pintle means to establish a predetermined permeability, and said upper layer having a predetermined permeability different from that of said under layer.
Claim 2
Dependent Claim
83 words
An improved multilayer papermakers fabric of the type having an under layer of interconnected synthetic monofilament yarns and an upper layer, said under layer and upper layer being retained in a single fabric by adhesive means, the improvement characterized by: said under layer being comprised of a plurality of intermeshed synthetic monofilament spiral strips which are retained in that relationship by pintle means to establish a predetermined permeability, and said upper layer having a predetermined permeability different from that of said under layer.
Claim 3
Dependent Claim
30 words
The fabric of claim 1, further characterized by: each of said spiral strips containing a plurality of spirals, each of said spirals having a major axis and a minor axis.
Claim 4
Dependent Claim
33 words
The fabric of claim 2, further characterized by: face portions of at least a first surface of said spirals having a width greater than the diameter of the monofilament comprising the spiral strips.
Claim 5
Dependent Claim
23 words
The fabric of claim 3, further characterized by: said face portions having a width no greater than twice the diameter of the monofilament.
Claim 6
Dependent Claim
43 words
The fabric of claim 3, further characterized by: said face portions having a maximum length defined by the equation maximum length equals the major axis minus twice the diameter of the pintle means plus four times the diameter of the monofilament or L=M-(2p+4d).
Claim 7
Dependent Claim
32 words
The fabric of claim 3, further characterized by: second face portions on a second surface of said spirals having a width greater than a diameter of the monofilament comprising the spiral strips.
Claim 8
Dependent Claim
24 words
The fabric of claim 6, further characterized by: said second face portions having a width no greater than twice the diameter of the monofilament.
Claim 9
Dependent Claim
44 words
The fabric of claim 7, further characterized by: said second face portions having a maximum length defined by the equation maximum length equals the major axis minus twice the diameter of the pintle means plus four times the diameter of the monofilament or L=M-(2p+4d).
Claim 10
Dependent Claim
46 words
The fabric of claim 7, further characterized by: said first and second face portions having a maximum length defined by the equation maximum length equals the major axis minus twice the diameter of the pintle means plus four times the diameter of the monofilament or L=M-(2p+4d).
Claim 11
Dependent Claim
33 words
The fabric of claim 1 wherein said upper layer is further characterized by: having a percent open area which is in the range of 10 to 48 percent of the total fabric area.
Claim 12
Dependent Claim
30 words
The fabric of claim 10, further characterized by: each of said spiral strips containing a plurality of spirals, each of said spirals having a major axis and a minor axis.
Claim 13
Dependent Claim
33 words
The fabric of claim 11, further characterized by: face portions of at least a first surface of said spirals having a width greater than the diameter of the monofilament comprising the spiral strips.
Claim 14
Dependent Claim
23 words
The fabric of claim 12, further characterized by: said face portions having a width no greater than twice the diameter of the monofilament.
Claim 15
Dependent Claim
43 words
The fabric of claim 12, further characterized by: said face portions having a maximum length defined by the equation maximum length equals the major axis minus twice the diameter of the pintle means plus four times the diameter of the monofilament or L=M-(2p+4d).
Claim 16
Dependent Claim
32 words
The fabric of claim 12, further characterized by: second face portions on a second surface of said spirals having a width greater than a diameter of the monofilament comprising the spiral strips.
Claim 17
Dependent Claim
24 words
The fabric of claim 15, further characterized by: said second face portions having a width no greater than twice the diameter of the monofilament.
Claim 18
Dependent Claim
44 words
The fabric of claim 16, further characterized by: said second face portions having a maximum length defined by the equation maximum length equals the major axis minus twice the diameter of the pintle means plus four times the diameter of the monofilament or L=M-(2p+4d).
Claim 19
Dependent Claim
46 words
The fabric of claim 16, further characterized by: said first and second face portions having a maximum length defined by the equation maximum length equals the major axis minus twice the diameter of the pintel means plus four times the diameter of the monofilament or L=M-(2p+4d).
Claim 20
Dependent Claim
22 words
The fabric of claim 10, wherein said under layer is further characterized by: having a permeability which is less than 1000 CFM.
Claim 21
Dependent Claim
41 words
The fabric of claim 1 wherein said under layer is further characterized by: having a permeability less than said upper layer and a percent open area which is in the range of 18 to 35 percent of the total fabric area.
Claim 22
Dependent Claim
20 words
The fabric of claim 1 wherein said upper layer is further characterized by: said upper layer being a non-woven layer.
Claim 23
Dependent Claim
63 words
An improved multilayer papermakers fabric of the type having an under layer of interconnected synthetic monofilament yarns and an upper layer, said under layer and upper layer being retained in a single fabric by adhesive means, the improvement characterized by: said under layer being comprised of a plurality of intermeshed synthetic monofilament spiral strips which are retained in that relationship by pintle means.
Claim 24
Dependent Claim
63 words
An improved multilayer papermakers fabric of the type having an under layer of interconnected synthetic monofilament yarns and an upper layer, said under layer and upper layer being retained in a single fabric by adhesive means, the improvement characterized by: said under layer being comprised of a plurality of intermeshed synthetic monofilament spiral strips which are retained in that relationship by pintle means.
References Cited (Backward Citations)
US4500590A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-03-31 | 1989-09-30 | 1990-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-03-31 | 1993-09-30 | 1994-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-03-31 | 1997-09-30 | 1998-04-01 | $7700.00 | Window Closed / Lapsed |