US3673292A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of gas permeable hydrophobic foils for electrochemical cells
Assignee: Robert Bosch GmbH
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Filing: 1969-06-11
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Granted: 1972-06-27
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Expires: 1989-06-11
Abstract
Abstract Gas permeable hydrophobic foils useful for electrochemical cells prepared by covering a temperature resistant hot plate or mold with a temperature resistant release layer, spraying a suspension or solution of a fluorine containing polymer onto said release layer and sintering the polymer.
Inventors
- 👤 Klaus Kock
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:01
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/24; H; H01; H01M; H01M4/00; H01M4/86; H01M8/00; Y; Y02; Y02E; Y02E60/00; Y02E60/30; Y02E60/50; Y02P; Y02P70/00; Y02P70/50; Y10; Y10S; Y10S264/00; Y10S264/62; Y10S264/65; Y10S264/72
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
10 words
Process according to claim 1, wherein said polytetrahaloethylene is polytetrafluoroethylene.
Claim 2
Dependent Claim
10 words
Process according to claim 1 wherein said polytetrahaloethylene is polytrifluoromonochloroethylene.
Claim 3
Dependent Claim
11 words
Process according to claim 1, wherein said liquid hydrocarbon is ligroin.
Claim 4
Dependent Claim
11 words
Process according to claim 1, wherein said liquid hydrocarbon is gasoline.
Claim 5
Dependent Claim
17 words
Process according to claim 1, wherein said suspension of polytetrahaloethylene additionally contains a leachable pore forming agent.
Claim 6
Dependent Claim
13 words
Process according to claim 6, wherein said pore forming agent is zinc oxide.
Claim 7
Dependent Claim
19 words
Process according to claim 6, wherein said pore forming is removed following said sintering by extraction with hydrochloric acid.
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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) | 1975-06-27 | 1975-12-27 | 1976-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-27 | 1979-12-27 | 1980-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-27 | 1983-12-27 | 1984-06-27 | $7700.00 | Window Closed / Lapsed |