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US4342679A
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Wear-resistant sintered composition having an empirical formula CF1.3 comprising graphite fibers, fluonnated graphite, and PTFE
Assignee: Waters Technologies Corp
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Filing: 1980-08-27
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Granted: 1982-08-03
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Expires: 2000-08-27
Abstract
Abstract A composition suitable for manufacturing into wear-resistant and chemically-inert articles, the composition being a mixture of 74 to 84% polytetrafluoroethylene, 7-17% graphite fibers, and 4-14% fluorinated graphite.
Inventors
- 👤 Louis Abrahams
- 👤 Thomas P. J. Izod
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:24
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/16; C08K7/00; C08K7/02; C08K7/04; C08K7/06
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
36 words
A sintered substantially non-oxidized composition having the empirically derived formula of about CF 1 .3, said composition being prepared from a mixture consisting essentially of 74-84% by weight polytetrafluoroethylene, 7-17% graphite fibers, and 4-14% fluorinated graphite.
Claim 2
Dependent Claim
36 words
A sintered substantially non-oxidized composition having the empirically derived formula of about CF 1 .3, said composition being prepared from a mixture consisting essentially of 74-84% by weight polytetrafluoroethylene, 7-17% graphite fibers, and 4-14% fluorinated graphite.
Claim 3
Dependent Claim
20 words
The composition of claim 1 wherein the mixture consists of about 79% polytetrafluoroethylene, 12% graphite fibers, and 9% fluorinated graphite.
References Cited (Backward Citations)
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US3528955A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-08-02 | 1986-02-01 | 1986-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-08-02 | 1990-02-01 | 1990-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-08-02 | 1994-02-01 | 1994-08-03 | $7700.00 | Window Closed / Lapsed |