Patent US5944441A successfully refreshed from Google Patents.
Patent US3268477A successfully refreshed from Google Patents.
US3268477A
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Process for curing polyepoxides with carboxylic acids and metallic oxides
Assignee: Shell USA Inc
•
Filing: 1958-12-23
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Granted: 1966-08-23
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Expires: 1978-12-23
Abstract
No abstract record available.
Inventors
- 👤 Albert C Mueller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:29
CPC Classifications
C; C08; C08G; C08G59/00; C08G59/18; C08G59/68; C08G59/40; C08G59/42; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1089
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
39 words
A PROCESS FOR PRODUCING A RESINIFIED PRODUCT WHICH CONSISTS OF MIXING AND REACTING A POLYEPOXIDE HAVING MORE THAN ONE VICINAL EPOXY GROUP WITH (1) A POLYCARBOXYLIC ACID WHICH IS A HALF ESTER OF A CYCLIC ANHYDRIDE OF THE FORMULA
Claim 2
Dependent Claim
39 words
A PROCESS FOR PRODUCING A RESINIFIED PRODUCT WHICH CONSISTS OF MIXING AND REACTING A POLYEPOXIDE HAVING MORE THAN ONE VICINAL EPOXY GROUP WITH (1) A POLYCARBOXYLIC ACID WHICH IS A HALF ESTER OF A CYCLIC ANHYDRIDE OF THE FORMULA
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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) | 1969-08-22 | 1970-02-21 | 1970-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-08-22 | 1974-02-21 | 1974-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-08-22 | 1978-02-21 | 1978-08-23 | $7700.00 | Window Closed / Lapsed |