Patent US4503171A successfully refreshed from Google Patents.
US4503171A
Expired / Lapsed
US
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Graphite reinforced perfluoroelastomer
Assignee: EIDP Inc
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Filing: 1984-01-11
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Granted: 1985-03-05
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Expires: 2004-01-11
Abstract
Abstract Graphite particularly suitable for compounding with perfluoroelastomers having grafted thereto reactive sites having a fluorinated aromatic ring. The perfluoroelastomer blends exhibit markedly improved tensile strength while retaining the outstanding thermal and chemical stability of the perfluoroelastomers.
Inventors
- 👤 Charles W. Stewart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:02
CPC Classifications
C; C08; C08K; C08K9/00; C08K9/04; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2998
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
46 words
A solid, particulate filler selected from the group consisting of carbon black and graphite having chemically bonded thereto reactive sites of the general formula ##STR5## wherein R is selected from the group consisting of a divalent bond, --CH 2 -- and --CH 2 CH 2 --.
Claim 2
Dependent Claim
46 words
A solid, particulate filler selected from the group consisting of carbon black and graphite having chemically bonded thereto reactive sites of the general formula ##STR5## wherein R is selected from the group consisting of a divalent bond, --CH 2 -- and --CH 2 CH 2 --.
Claim 3
Dependent Claim
19 words
A filler of claim 1 wherein the carbonaceous material to which the reactive sites are bonded is carbon black.
Claim 4
Dependent Claim
18 words
A filler of claim 1 wherein the carbonaceous material to which the reactive sites are bonded is graphite.
Claim 5
Dependent Claim
99 words
An elastomeric composition comprising complementally, (a) 95-50 weight percent of at least one perfluoronated elastomer prepared from tetrafluoroethylene, perfluoromethylvinylether and a monomer of the general formula ##STR6## wherein R 1 is selected from ##STR7## and --CH 2 CH 2 CH 2 --O-- and wherein n is 0, 1 or 2 and (b) 5-50 weight percent a solid particulate filler selected from the group consisting of carbon black and graphite having chemically bonded thereto reactive sites of the general formula ##STR8## wherein R is selected from the group consisting of a divalent bond, --CH 2 -- and --CH 2 CH--.
Claim 6
Dependent Claim
99 words
An elastomeric composition comprising complementally, (a) 95-50 weight percent of at least one perfluoronated elastomer prepared from tetrafluoroethylene, perfluoromethylvinylether and a monomer of the general formula ##STR6## wherein R 1 is selected from ##STR7## and --CH 2 CH 2 CH 2 --O-- and wherein n is 0, 1 or 2 and (b) 5-50 weight percent a solid particulate filler selected from the group consisting of carbon black and graphite having chemically bonded thereto reactive sites of the general formula ##STR8## wherein R is selected from the group consisting of a divalent bond, --CH 2 -- and --CH 2 CH--.
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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) | 1988-03-04 | 1988-09-03 | 1989-03-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-03-04 | 1992-09-03 | 1993-03-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-03-04 | 1996-09-03 | 1997-03-05 | $7700.00 | Window Closed / Lapsed |