Patent US4414356A successfully refreshed from Google Patents.
US4414356A
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Tetrafluoroethylene copolymer
Assignee: EIDP Inc
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Filing: 1983-02-10
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Granted: 1983-11-08
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Expires: 2003-02-10
Abstract
Abstract An intimate blend of a melt-fabricable tetrafluoroethylene copolymer resin and graphite reinforcing fibers having an untreated surface is obtained by intimately blending the resin and fibers in a mixture of water and a selected water-miscible organic solvent. Composites molded from the blend have good resistance to steam and alkali.
Inventors
- 👤 Rudolph H. Michel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 21:24
CPC Classifications
C; C08; C08K; C08K7/00; C08K7/02; C08K7/04; C08K7/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
108 words
A composition consisting of an intimate admixture of a major portion of (a) a melt-fabricable tetrafluoroethylene copolymer resin having a melt viscosity between 1×10 4 and 1×10 7 poises at 380° C. and an average particle size of below 400 μm, and wherein the comonomers used to make the copolymer are perfluorinated ethylenically unsaturated organic copolymerizable monomers, and a minor portion of (b) graphite fibers that have not been treated by a process which increases surface oxygen and nitrogen content and which have an average of less than 6 atom % oxygen and less than 3 atom % nitrogen in the outermost 5 nm of fiber cross section.
Claim 2
Dependent Claim
108 words
A composition consisting of an intimate admixture of a major portion of (a) a melt-fabricable tetrafluoroethylene copolymer resin having a melt viscosity between 1×10 4 and 1×10 7 poises at 380° C. and an average particle size of below 400 μm, and wherein the comonomers used to make the copolymer are perfluorinated ethylenically unsaturated organic copolymerizable monomers, and a minor portion of (b) graphite fibers that have not been treated by a process which increases surface oxygen and nitrogen content and which have an average of less than 6 atom % oxygen and less than 3 atom % nitrogen in the outermost 5 nm of fiber cross section.
References Cited (Backward Citations)
US4163742A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-11-07 | 1987-05-09 | 1987-11-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-11-07 | 1991-05-09 | 1991-11-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-11-07 | 1995-05-09 | 1995-11-08 | $7700.00 | Window Closed / Lapsed |