US4177159A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalytic dry powder material for fuel cell electrodes comprising fluorocarbon polymer and precatalyzed carbon
Assignee: RTX Corp
•
Filing: 1978-06-28
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Granted: 1979-12-04
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Expires: 1998-06-28
Abstract
Abstract A novel powder particularly suitable for forming the catalyst layer in the manufacture of electrochemical cell electrodes comprises a high molecular weight fluorocarbon polymer and precatalyzed carbon. The maximum size of the particles is about five microns and the polymer has a molecular weight of at least one million.
Inventors
- 👤 Roger M. Singer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:18
CPC Classifications
B; B01; B01J; B01J31/00; B01J31/02; B01J31/06; H; H01; H01M; H01M4/00; H01M4/86; H01M4/8663; Y; Y02; Y02E; Y02E60/00; Y02E60/30; Y02E60/50
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
44 words
A finely divided dry powder having a maximum particle size of about five microns and a mean particle size of about one micron or less, said powder comprising precatalyzed carbon and polytetrafluoroethylene, the polytetrafluoroethylene having a molecular weight of at least 10 6 .
Claim 2
Dependent Claim
44 words
A finely divided dry powder having a maximum particle size of about five microns and a mean particle size of about one micron or less, said powder comprising precatalyzed carbon and polytetrafluoroethylene, the polytetrafluoroethylene having a molecular weight of at least 10 6 .
Claim 3
Dependent Claim
45 words
The finely divided powder according to claim 1 wherein said powder consists of floc particles formed by floccing a co-suspension of said precatalyzed carbon particles and polytetrafluoroethylene particles, drying the floc so formed, and reducing the floc to a powder having said maximum particle size.
Claim 4
Dependent Claim
15 words
The finely divided powder according to claim 1 wherein the powder consists of floc particles.
Claim 5
Dependent Claim
24 words
The finely divided powder according to claim 1 wherein said powder is a mechanical mixture of individual polytetrafluoroethylene particles and individual precatalyzed carbon particles.
Claim 6
Dependent Claim
44 words
The finely divided powder according to claim 4 wherein said powder is formed by mechanically mixing together precatalyzed carbon particles and polytetrafluoroethylene particles and subsequently reducing the particle size of said mixture to no greater than said maximum size in a fluid energy mill.
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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) | 1982-12-03 | 1983-06-04 | 1983-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-12-03 | 1987-06-04 | 1987-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-12-03 | 1991-06-04 | 1991-12-04 | $7700.00 | Window Closed / Lapsed |