US3582509A
Expired / Lapsed
US
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Preparation of epoxy-anhydride compositions from an epoxy resin and an acid anhydride containing two cyclic and one linear anhydride group
Assignee: INST TWORZYW SZTUCZNYCH
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Filing: 1968-10-14
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Granted: 1971-06-01
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Expires: 1988-10-14
Abstract
Abstract PREPARATION OF EPOXY-ANHYDRIDE COMPOSITION BY REACTING AN EPOXY RESIN WITH AN ACID ANHYDRIDE CONTAINING TWO CYCLIC AND ONE LINEAR ANHYDRIDE GROUP. THE ACID ANHYDRIDE HAS THE FORMULA: 1,3-DI(O=),6,9A-DI(CH3-),6-((1,3-DI(O=),6,9A-DI(CH3-),12- (CH3-CH(-CH3)-)-3,3A,4,5,5A,6,7,8,9,9A,9B,10,11,11A- TETRADECAHYDRO-1H-3B,11-ETHENOPHENANTHRO(1,2-C)FUR-6- YL)-CO-O-CO-),12-(CH3-CH(-CH3)-)-3,3A,4,5,5A,6,7,8,9,9A, 9B,10,11,11A-TETRADECAHYDRO-1H-3B,11-ETHENOPHENANTHRO- (1,2-C)FURAN THE REACTION PRODUCT IS THERMO HARDENED AT 80-210*C.
Inventors
- 👤 Henryk Staniak
- 👤 Piotr Penczek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:35
CPC Classifications
C; C08; C08G; C08G59/00; C08G59/18; C08G59/40; C08G59/42; C08G59/4215; C09; C09F; C09F1/00; C09F1/04
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) | 1974-05-31 | 1974-11-30 | 1975-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-31 | 1978-11-30 | 1979-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-31 | 1982-11-30 | 1983-06-01 | $7700.00 | Window Closed / Lapsed |