US3562213A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Latent cure acceleration of epoxy resins using imidazole salts of hydroxy polycarboxylic acids
Assignee: Shell USA Inc
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Filing: 1968-05-08
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Granted: 1971-02-09
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Expires: 1988-05-08
Abstract
Abstract ROOM TEMPERATURE-STABLE EPOXY RESIN MIXTURES ARE DISCLOSED. THESE MIXUTRES COMPRISE A POLYEPOXIDE, A POLYCARBOXYLIC ACID ANHYDRIDE AND A CURING CATALYST WHICH IS A SALT OF AN IMIDAZOLE COMPOUND AND AN ORGANIC HYDROXY POLYCARBOXYLIC ACID CONTAINING AT LEAST ONE ASYMMETRIC CARBON ATOM. A PROCESS FOR PREPARING RESINIFIED PRODUCTS FROM SUCH MIXTURES IS ALSO DISCLOSED.
Inventors
- 👤 Michael J Collis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:29
CPC Classifications
C; C08; C08G; C08G59/00; C08G59/18; C08G59/40; C08G59/50; C08G59/5093; C08G59/56; C08G59/58
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) | 1974-02-08 | 1974-08-10 | 1975-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-08 | 1978-08-10 | 1979-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-08 | 1982-08-10 | 1983-02-09 | $7700.00 | Window Closed / Lapsed |