Patent US2537631A successfully refreshed from Google Patents.
US2537631A
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Latex compositions and method of producing porous diaphragms
Assignee: Bridgestone Firestone Inc
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Filing: 1945-11-29
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Granted: 1951-01-09
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Expires: 1965-11-29
Abstract
No abstract record available.
Inventors
- 👤 Harold W Greenup
- 👤 Green Victor Malcolm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:05
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/26; C08J9/0061; C08L; C08L21/00; H; H01; H01M; H01M50/00; H01M50/40; H01M50/403; H01M50/409; H01M50/446; H01M50/449; H01M50/489; C08J2201/00; C08J2201/04; C08J2201/042; C08J2201/0422; C08J2307/00; C08J2307/02; C08J2403/00; C08J2403/02; C08J2495/00; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
46 words
A MICROPOROUS EBONITE DIAPHRAGM WHICH COMPIRSES HARD RUBBER FORMED OF 50 PARTS OF RUBBER VULCANIZED WITH 20 PARTS OF SULFUR, 7 1/2 PARTS COUMARONE RESIN WITH A MELTING POINT OF 230 TO 280* F., AND 12 1/2 PARTS OF ASPHALT MELTING AT 250 TO 350* F.
Claim 2
Dependent Claim
46 words
A MICROPOROUS EBONITE DIAPHRAGM WHICH COMPIRSES HARD RUBBER FORMED OF 50 PARTS OF RUBBER VULCANIZED WITH 20 PARTS OF SULFUR, 7 1/2 PARTS COUMARONE RESIN WITH A MELTING POINT OF 230 TO 280* F., AND 12 1/2 PARTS OF ASPHALT MELTING AT 250 TO 350* F.
References Cited (Backward Citations)
US1968887A
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US2155016A
Cited
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Cited
US2175798A
Cited
US2291786A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-01-08 | 1954-07-10 | 1955-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-01-08 | 1958-07-10 | 1959-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-01-08 | 1962-07-10 | 1963-01-09 | $7700.00 | Window Closed / Lapsed |