US3753932A
Expired / Lapsed
US
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Process for preparing microporous opencelled cellular polymeric structures
Assignee: EIDP Inc
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Filing: 1970-12-23
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Granted: 1973-08-21
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Expires: 1990-12-23
Abstract
Abstract A PROCESS FOR PREPARING MICROPOROUS OPEN-CELLED CELLULAR POLYMERIC STRUCTURES WHICH COMPRISES (A) DISSOLVING THE STARTING POLYMER IN A CHLOROFULOROCARBON SOLVENT, (B) COOLING THE RESULTING SOLUTION TO AT LEAST THE SOLIDIFICATION TEMPERATURE OF THE CHLOROFLUOROCARBON SOLVENT, AND (C) REMOVING THE CHLOROFLUOROCARBON SOLVENT, AND (C) FIED SOLUTION AT A TEMPERATURE EQUAL TO OR LOWER THAN THE SOLIDIFICATION TEMPERATURE OF SAID CHLOROFLUOROCARBON.
Inventors
- 👤 Francis Edward Jenkins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 00:17
CPC Classifications
B; B32; B32B; B32B5/00; B32B5/22; B32B5/32; C; C08; C08J; C08J9/00; C08J9/26; B32B27/00; B32B27/06; B32B27/065; B32B27/08; B32B5/18; B32B5/20; B32B2266/00; B32B2266/06; C08J2201/00; C08J2201/04; C08J2201/05; C08J2201/0502; C08J2201/054; C08J2201/0542; C08J2201/0544
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) | 1976-08-20 | 1977-02-19 | 1977-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-20 | 1981-02-19 | 1981-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-20 | 1985-02-19 | 1985-08-21 | $7700.00 | Window Closed / Lapsed |