US3751897A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Asbestos yarn reinforced with continuous strand of a polyvinyl alcohol
Assignee: Johns Manville Corp
•
Filing: 1971-03-29
•
Granted: 1973-08-14
•
Expires: 1991-03-29
Abstract
Abstract A high tensile strength and chemical resistant asbestos yarn product comprising a composite of a core strand composed of a spun yarn of staple polyvinyl alcohol fiber and with overlying staple asbestos fiber twisted thereabout.
Inventors
- 👤 G Bailey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:37
CPC Classifications
D; D02; D02G; D02G3/00; D02G3/02; D02G3/16; D02G3/20
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
34 words
The reinforced yarn of claim 1 wherein the overlying staple fiber component comprises a blend of staple asbestos fibers in the major proportion and including dispersed therethrough a minor proportion of staple organic fiber.
Claim 2
Dependent Claim
18 words
The reinforced yarn of claim 2 wherein the staple organic fiber blended with the asbestos fiber is rayon.
Claim 3
Dependent Claim
26 words
The reinforced yarn of claim 3 wherein the staple organic rayon fiber comprises up to about 25 percent by weight of the total staple fiber blend.
Claim 4
Dependent Claim
34 words
The reinforced yarn of claim 1 wherein said yarn is twisted about itself to twist interlock the staple fibers in said staple fiber component both with themselves and with the fibers of said reinforcement.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-13 | 1977-02-12 | 1977-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-13 | 1981-02-12 | 1981-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-13 | 1985-02-12 | 1985-08-14 | $7700.00 | Window Closed / Lapsed |