Patent US3971748A successfully refreshed from Google Patents.
US3971748A
Expired / Lapsed
US
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Graphite powder-polyphenylene mixtures and composites
Assignee: Standard Oil Co
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Filing: 1975-10-07
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Granted: 1976-07-27
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Expires: 1995-10-07
Abstract
Abstract Moldable resin mixtures comprising branched soluble polyphenylenes and graphite powder are useful as plates in acid electrolytic fuel cells and in other applications.
Inventors
- 👤 Chen-Shen Wang
- 👤 Eli W. Blaha
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:38
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/02; H01M4/64; H01M4/66; H01M4/663; C; C08; C08G; C08G61/00; C08G61/02; C08G61/10; C08K; C08K3/00; C08K3/02; C08K3/04; C08K7/00; C08L; C08L65/00; C08L65/02; F; F16; F16J; F16J15/00; F16J15/16; F16J15/34; F16J15/3496; H01B; H01B1/00; H01B1/20; H01B1/24; H01M8/00; H01M8/02; H01M8/0202; H01M8/0204; H01M8/0213; C08G2261/00; C08G2261/30; C08G2261/31; C08G2261/312; Y; Y02; Y02E; Y02E60/00; Y02E60/10; Y02E60/30; Y02E60/50
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
198 words
A moldable resin mixture comprising: a. about 25 to 95% graphite powder; b. about 5 to 75% branched polyphenylene comprising benzene ring structures bonded into a polymer chain wherein the linear infrared absorbance spectrum integrated peak area within the frequency range 726-930 cm - 1 is distributed as follows: from 10 to 18% of the integrated peak area is within the frequency range 854-930 cm - 1 , from 15 to 30% is within the frequency range 850-853 cm - 1 , from 13 to 20% is within the frequency range 778-805 cm - 1 , and the remainder of the integrated peak area within the frequency range 726-930 cm - 1 is within the frequency range 726-777 cm - 1 ; and c. 0 to about 30% branched nitropolyphenylene comprising benzene ring structures bonded into a polymer chain and from 0.25 to 15 percent by weight of nitrogen wherein infrared absorbance occurs at frequencies of about 1345 cm - 1 and about 1525 cm - 1 and at least 8% of the linear infrared absorbance spectrum integrated peak area within the frequency range 726-930 cm - 1 is within the frequency range 856-930 cm - 1 .
Claim 2
Dependent Claim
198 words
A moldable resin mixture comprising: a. about 25 to 95% graphite powder; b. about 5 to 75% branched polyphenylene comprising benzene ring structures bonded into a polymer chain wherein the linear infrared absorbance spectrum integrated peak area within the frequency range 726-930 cm - 1 is distributed as follows: from 10 to 18% of the integrated peak area is within the frequency range 854-930 cm - 1 , from 15 to 30% is within the frequency range 850-853 cm - 1 , from 13 to 20% is within the frequency range 778-805 cm - 1 , and the remainder of the integrated peak area within the frequency range 726-930 cm - 1 is within the frequency range 726-777 cm - 1 ; and c. 0 to about 30% branched nitropolyphenylene comprising benzene ring structures bonded into a polymer chain and from 0.25 to 15 percent by weight of nitrogen wherein infrared absorbance occurs at frequencies of about 1345 cm - 1 and about 1525 cm - 1 and at least 8% of the linear infrared absorbance spectrum integrated peak area within the frequency range 726-930 cm - 1 is within the frequency range 856-930 cm - 1 .
Claim 3
Dependent Claim
27 words
The moldable resin mixture of claim 1 comprising about 85 to 95% graphite powder and about 5 to 15% branched polyphenylene and less than about 5% nitropolyphenylene.
Claim 4
Dependent Claim
9 words
A composite formed from the mixture of claim 1.
Claim 5
Dependent Claim
9 words
A composite formed from the mixture of claim 2.
Claim 6
Dependent Claim
13 words
An electrically conductive fuel cell plate formed from the composite of claim 4.
Claim 7
Dependent Claim
17 words
The moldable resin mixture of claim 1 comprising about 90% graphite powder and about 10% branched polyphenylene.
Claim 8
Dependent Claim
9 words
The composite formed from the mixture of claim 6.
Claim 9
Dependent Claim
13 words
An electrically conductive fuel cell plate formed from the composite of claim 7.
Claim 10
Dependent Claim
28 words
A composite formed from the mixture of claim 1 containing about 40 to 70% graphite powder, about 30 to 60% branched polyphenylene and 0 to about 10% nitropolyphenylene.
Claim 11
Dependent Claim
11 words
A mechanical seal element formed from the composite of claim 9.
References Cited (Backward Citations)
US3600341A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-07-27 | 1980-01-26 | 1980-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-07-27 | 1984-01-26 | 1984-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-07-27 | 1988-01-26 | 1988-07-27 | $7700.00 | Window Closed / Lapsed |