US4337140A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Strengthening of carbon black-teflon-containing electrodes
Assignee: Diamond Shamrock Chemicals Co
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Filing: 1980-10-31
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Granted: 1982-06-29
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Expires: 2000-10-31
Abstract
Abstract This disclosure is directed to strengthening carbon black-particulate "Teflon" (PTFE) mixes destined to be formed into active layers in air cathodes, which comprises forming the carbon black-particulate Teflon mix; fibrillating said mix along with a substantial quantity of soluble pore-forming agent; adding polytetrafluoroethylene (PTFE) fibers while chopping said fibrillated mix; and thereafter rolling said chopped fibrillated mix containing said PTFE fibers into sheet form.
Inventors
- 👤 Frank Solomon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:16
CPC Classifications
C; C25; C25B; C25B11/00; C25B11/04; C25B11/042; C25B11/043; H; H01; H01M; H01M4/00; H01M4/86; H01M4/8663; H01M4/8668; H01M4/88; H01M4/8817; H01M4/90; H01M4/92; Y; Y02; Y02E; Y02E60/00; Y02E60/30; Y02E60/50
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
22 words
An electrode active layer comprising a mixture containing particulate carbon black and fibrillated unsintered polytetrafluoroethylene in chopped admixture with sintered polytetrafluoroethylene fibers.
Claim 2
Dependent Claim
22 words
An electrode active layer comprising a mixture containing particulate carbon black and fibrillated unsintered polytetrafluoroethylene in chopped admixture with sintered polytetrafluoroethylene fibers.
Claim 3
Dependent Claim
16 words
An electrode active layer as in claim 1 wherein said fibrillated mixture includes a pore-forming agent.
Claim 4
Dependent Claim
12 words
An electrode active layer as in claim 1 including precious metal catalyst.
Claim 5
Dependent Claim
36 words
An electrode as in claim 1 wherein said fibers are characterized by an average length of about 0.005 to about 0.05 inch and a denier (per filament) of about 3 to about 10 prior to chopping.
Claim 6
Dependent Claim
12 words
An electrode as in claim 3 wherein said precious metal is platinum.
References Cited (Backward Citations)
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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) | 1985-06-28 | 1985-12-28 | 1986-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-06-28 | 1989-12-28 | 1990-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-06-28 | 1993-12-28 | 1994-06-29 | $7700.00 | Window Closed / Lapsed |