US3749604A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat resistant substrates and battery separators made therefrom
Assignee: Westinghouse Electric Corp
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Filing: 1970-03-12
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Granted: 1973-07-31
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Expires: 1990-03-12
Abstract
Abstract A FLEXIBLE SUBSTRATE HAVING A CAUSTIC RESISTANT SUPPORT AND AT LEAST ONE MEMBRANE COMPRISING A SOLID POLYMERIC MATRIX CONTAINING A NETWORK OF INTERCONNECTD PORES AND INTERDISPERSED INORGANIC FILLER PARTICLES WITH A RATIO OF FILLER: POLYMER IN THE POLYMERIC MATRIX OF BETWEEN ABOUT 1:1 TO 5:1, IS MADE BY COATING AT LEAST ONE SIDE OF THE SUPPORT WITH A FILLER:COATING FORMULATION MIXTURE OF INORGANIC FILLER PARTICLES AND A CAUSTIC RESISTANT, WATER INSOLUBLE POLYMER DISSOLVED IN AN ORGANIC SOLVENT, AND REMOVING THE SOLVENT FROM THE MIXTURE TO PROVIDE A POROUS NETWORK WITHIN THE POLYMERIC MATRIX.
Inventors
- 👤 A Langer
- 👤 C Ruffing
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:32
CPC Classifications
H; H01; H01M; H01M50/00; H01M50/40; H01M50/489; H01M50/409; H01M50/411; H01M50/414; H01M50/417; H01M50/426; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
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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) | 1976-07-30 | 1977-01-29 | 1977-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-30 | 1981-01-29 | 1981-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-30 | 1985-01-29 | 1985-07-31 | $7700.00 | Window Closed / Lapsed |