Patent US3329652A successfully refreshed from Google Patents.
US3329652A
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Process for curing polyepoxides with anhydrides and activators therefor
Assignee: Shell USA Inc
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Filing: 1965-02-15
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Granted: 1967-07-04
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Expires: 1985-02-15
Abstract
No abstract record available.
Inventors
- 👤 Samuel H Christie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:31
CPC Classifications
C; C08; C08G; C08G59/00; C08G59/18; C08G59/68; C08G59/686; C08G59/40; C08G59/50; C08G59/5093
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
59 words
A PROCESS FOR CURING POLYEPOXIDES HAVING A 1,2EPOXY EQUIVALENCY OF AT LEAST 1.1 WITH AT LEAST 0.5 EQUIVALENT OF A POLYCARBOXYLIC ACID ANHYDRIDE AND FROM 0.1 TO 10% BY WEIGHT OF THE POLYEPOXIDE OF AN IMIDAZOLE SALT SELECTED FROM THE GROUP CONSISTING OF THE ACETATE, FORMATE, LACTATE, PROPIONATE AND PHOSPHATE SALTS OF 2-ETHYL-4-METHYLIMIDAZOLE, 2-METHYLIMIDAZOLE, IMIDAZOLE, BENZIMIDAZOLE AND MIXTURES THEREOF.
Claim 2
Dependent Claim
59 words
A PROCESS FOR CURING POLYEPOXIDES HAVING A 1,2EPOXY EQUIVALENCY OF AT LEAST 1.1 WITH AT LEAST 0.5 EQUIVALENT OF A POLYCARBOXYLIC ACID ANHYDRIDE AND FROM 0.1 TO 10% BY WEIGHT OF THE POLYEPOXIDE OF AN IMIDAZOLE SALT SELECTED FROM THE GROUP CONSISTING OF THE ACETATE, FORMATE, LACTATE, PROPIONATE AND PHOSPHATE SALTS OF 2-ETHYL-4-METHYLIMIDAZOLE, 2-METHYLIMIDAZOLE, IMIDAZOLE, BENZIMIDAZOLE AND MIXTURES THEREOF.
References Cited (Backward Citations)
US3052650A
Cited
US3030376A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-07-03 | 1971-01-02 | 1971-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-07-03 | 1975-01-02 | 1975-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-07-03 | 1979-01-02 | 1979-07-04 | $7700.00 | Window Closed / Lapsed |