Patent US4298645A successfully refreshed from Google Patents.
US4298645A
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Tarpaulins having great tearing strength
Assignee: Hiraoka and Co Ltd
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Filing: 1980-07-14
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Granted: 1981-11-03
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Expires: 2000-07-14
Abstract
Abstract Tarpaulins having great tearing strength, which are produced by weaving base fabrics from the mixture of a principal thread and another thread being superior to the principal thread in either of breaking elongation, breaking strength and breaking work or being different from the principal thread in adhesive strength with respect to film, or from the mixture of the principal thread to be used for warp and woof and the another binding yarn being superior to the principal thread in either of breaking elongation, breaking strength and breaking work or being different from the principal thread in adhesive strength, and by forming films consisting of plastics, rubbers or mixtures thereof on the base fabrics by application or adhesion.
Inventors
- 👤 Tsutomu Obayashi
- 👤 Hideyuki Hiraoka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:45
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/12; B32B27/30; B32B27/304; B32B27/32; B32B27/40; B32B5/00; B32B5/02; B32B5/024; B32B2307/00; B32B2307/50; B32B2307/582; B32B2307/5825; B32B2307/70; B32B2307/726; B32B2307/7265; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24058; Y10T428/24074; Y10T428/24091; Y10T428/24099; Y10T442/00; Y10T442/30; Y10T442/3179; Y10T442/3301; Y10T442/3317
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
172 words
A tarpaulin having a great tear strength, comprising (A) a base fabric composed of (a) a warp layer consisting of a number of warp threads arranged parallel to each other; (b) a weft layer which consists of a number of weft threads arranged parallel to each other, said weft layer being superimposed on said warp layer in such a manner that the longitudinal direction of said weft threads crosses the longitudinal direction of said warp threads, and; (c) a number of auxiliary threads which are entangled around said warp threads and said weft threads and which combine said warp threads with said weft threads at the crossing points thereof, and; (B) at least one waterproofing layer formed on at least one surface of said base fabric, the breaking strength, the breaking elongation and/or the breaking work of said auxiliary threads being higher than that of said warp and weft threads, and/or the adhesive strength of said auxiliary threads to said waterproofing layer being lower than that of said warp and weft threads.
Claim 2
Dependent Claim
172 words
A tarpaulin having a great tear strength, comprising (A) a base fabric composed of (a) a warp layer consisting of a number of warp threads arranged parallel to each other; (b) a weft layer which consists of a number of weft threads arranged parallel to each other, said weft layer being superimposed on said warp layer in such a manner that the longitudinal direction of said weft threads crosses the longitudinal direction of said warp threads, and; (c) a number of auxiliary threads which are entangled around said warp threads and said weft threads and which combine said warp threads with said weft threads at the crossing points thereof, and; (B) at least one waterproofing layer formed on at least one surface of said base fabric, the breaking strength, the breaking elongation and/or the breaking work of said auxiliary threads being higher than that of said warp and weft threads, and/or the adhesive strength of said auxiliary threads to said waterproofing layer being lower than that of said warp and weft threads.
Claim 3
Dependent Claim
16 words
The tarpaulin of claim 1 wherein said warp threads and said weft threads are substantially identical.
Claim 4
Dependent Claim
23 words
The tarpaulin of claim 2 wherein said auxiliary threads have a breaking elongation at least 10% greater than said warp and weft threads.
Claim 5
Dependent Claim
23 words
The tarpaulin of claim 2 wherein said auxiliary threads have a breaking strength at least 10% greater than said warp and weft threads.
Claim 6
Dependent Claim
23 words
The tarpaulin of claim 2 wherein said auxiliary threads have a breaking work at least 10% greater than said warp and weft threads.
Claim 7
Dependent Claim
28 words
The tarpaulin of claim 1 wherein said waterproofing layer comprises a film of resin selected from the group consisting of vinyl chloride resin, chlorosulfonated polyethylene and urethane resin.
Claim 8
Dependent Claim
20 words
The tarpaulin of claim 6 wherein there is a film of said resin on both surfaces of said base fabric.
References Cited (Backward Citations)
US4025684A
Cited
US4183993A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-11-02 | 1985-05-04 | 1985-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-11-02 | 1989-05-04 | 1989-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-11-02 | 1993-05-04 | 1993-11-03 | $7700.00 | Window Closed / Lapsed |