Patent US3660337A successfully refreshed from Google Patents.
US3660337A
Expired / Lapsed
US
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Thermostable resins and their production
Assignee: Rhone Poulenc SA
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Filing: 1968-07-08
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Granted: 1972-05-02
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Expires: 1988-07-08
Abstract
Abstract THERMOSTABLE RESINS ARE MADE BY DISSOLVING IN AMMONIA A POLYCONDENSATION PRODUCT OF A MONOPHENOL OR POLYPHENOL WITH A POLYANHYDRIDE, A CORRESPONDING POLYACID, EVAPORATING THE SOLUTION TO DRYNESS, AND HEATING THE RESIDUE.
Inventors
- 👤 Maurice Balme
- 👤 Maurice Ducloux
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 09:23
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/02; C08G63/12; C08G63/123; C08G63/133; B; B32; B32B; B32B27/00; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1089; Y10T156/1092; Y10T156/1093
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-02 | 1975-11-01 | 1976-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-02 | 1979-11-01 | 1980-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-02 | 1983-11-01 | 1984-05-02 | $7700.00 | Window Closed / Lapsed |