US4029639A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Treated fabrics and process
Assignee: BP Corp North America Inc
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Filing: 1975-06-30
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Granted: 1977-06-14
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Expires: 1995-06-30
Abstract
Abstract Fabrics produced from aromatic sulfide polymers are rendered water-repellent by heat treatment near, but below, the melting point of the polymer for a finite period of time. The resulting heat-treated fabric is suitable for flame retardant tents, waterproof clothing, filters, etc.
Inventors
- 👤 James T. Gragson
- 👤 Joseph E. Ballard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 05:08
CPC Classifications
D; D06; D06M; D06M23/00; Y; Y10; Y10S; Y10S428/00; Y10S428/91; Y10S428/913; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T442/00; Y10T442/30; Y10T442/3976; Y10T442/40; Y10T442/60; Y10T442/696
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
83 words
An article of manufacture comprising a water-repellent fabric of phenylene sulfide polymer fibers produced from polymers having a melt flow within the range of 75 to 800 grams per 10 minutes as measured by ASTM method D-1238-70 modified to operate at 650° F with a piston load of 5 kilograms which has been heat treated in a relaxed state at a temperature near, but below, the melting point of the polymer for a finite period of time sufficient to render the fabric water-repellent.
Claim 2
Dependent Claim
83 words
An article of manufacture comprising a water-repellent fabric of phenylene sulfide polymer fibers produced from polymers having a melt flow within the range of 75 to 800 grams per 10 minutes as measured by ASTM method D-1238-70 modified to operate at 650° F with a piston load of 5 kilograms which has been heat treated in a relaxed state at a temperature near, but below, the melting point of the polymer for a finite period of time sufficient to render the fabric water-repellent.
Claim 3
Dependent Claim
19 words
An article according to claim 1 wherein said fibers are formed from at least partially cured phenylene sulfide polymers.
Claim 4
Dependent Claim
14 words
An article according to claim 1 wherein said fibers are formed from poly(phenylene sulfide).
Claim 5
Dependent Claim
44 words
An article according to claim 1 wherein said fibers are melt-spun fibers formed from poly(phenylene sulfide) and said fibers have been drawn in the solid state at least about three to about eight times to provide a high degree of orientation in said fibers.
Claim 6
Dependent Claim
39 words
An article according to claim 1 wherein said fibers are formed from poly(phenylene sulfide) and said fabric has been heat treated at a temperature of about 5° to about 25° C below the crystalline melting point of the polymer.
Claim 7
Dependent Claim
42 words
An article according to claim 1 wherein said fibers are formed from poly(phenylene sulfide) and said fabric has been heat treated at a temperature of about 260° to about 275° C for a finite period of time up to about 8 hours.
Claim 8
Dependent Claim
33 words
An article according to claim 1 wherein prior to said heat treatment said fabric is heat set under tension at a temperature of at least about 50° C below said heat treatment temperature.
References Cited (Backward Citations)
US2705880A
Cited
US3898204A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-06-13 | 1980-12-13 | 1981-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-06-13 | 1984-12-13 | 1985-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-06-13 | 1988-12-13 | 1989-06-14 | $7700.00 | Window Closed / Lapsed |