US4338181A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrode containing extraction treated particles
Assignee: Diamond Shamrock Chemicals Co
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Filing: 1980-10-31
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Granted: 1982-07-06
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Expires: 2000-10-31
Abstract
Abstract This disclosure is directed to a process for extracting PTFE-wetting agent from PTFE particles containing small amounts of wetting agent in admixture with carbon particles comprising contacting said mixture with an organic liquid medium capable of extracting said wetting agent, and electrodes containing such extracted mixes. Also disclosed is a process for forming an electrode layer by depositing a soluble salt on a filter medium, depositing electrode layer material on said salt consolidating said electrode material and thereafter dissolving said salt.
Inventors
- 👤 Frank Solomon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:00
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/86; H01M4/90; H01M4/92; C; C01; C01B; C01B32/00; C01B32/30; C01B32/354; C01B32/378; C25; C25B; C25B11/00; H01M4/8663; H01M4/8668; H01M4/88; H01M4/8817; H01M4/8821; H01M4/8825; H01M4/8842; H01M4/96; Y; Y02; Y02E; Y02E60/00; Y02E60/30; Y02E60/50
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
28 words
A process of treating polytetrafluoroethylene particles containing small amounts of wetting agent in admixture with carbon particles comprising contacting said mixture with chloroform to extract said wetting agent.
Claim 2
Dependent Claim
28 words
A process of treating polytetrafluoroethylene particles containing small amounts of wetting agent in admixture with carbon particles comprising contacting said mixture with chloroform to extract said wetting agent.
Claim 3
Dependent Claim
30 words
A process as in claim 1 wherein said carbon has a B.E.T. surface area of 500 m 2 /g and higher and contains less than about 4 weight percent ash.
Claim 4
Dependent Claim
21 words
A process as in claim 1 wherein said carbon is catalyzed with a precious metal prior to said mixture with polytetrafluoroethylene.
Claim 5
Dependent Claim
12 words
A process as in claim 3 wherein said precious metal is platinum.
Claim 6
Dependent Claim
26 words
A process as in claim 1 wherein said carbon particles are active carbon particles having a particle size ranging from about 1 to about 30 microns.
Claim 7
Dependent Claim
15 words
An electrode containing a mixture of carbon and PTFE particles treated as in claim 1.
Claim 8
Dependent Claim
38 words
An electrode as in claim 6 wherein said carbon is active carbon and said active carbon particles have a B.E.T. surface area of 500 m 2 /g and higher and contain less than about 4 weight percent ash.
References Cited (Backward Citations)
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US4177159A
Cited
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Cited
US4235748A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-07-05 | 1986-01-04 | 1986-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-07-05 | 1990-01-04 | 1990-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-07-05 | 1994-01-04 | 1994-07-06 | $7700.00 | Window Closed / Lapsed |