US3756984A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Epoxy imidazole adducts as curing agents for epoxy resins
Assignee: Shell USA Inc
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Filing: 1971-09-27
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Granted: 1973-09-04
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Expires: 1991-09-27
Abstract
Abstract THE ADDUCTS OF MONO- AND POLYEPOXIDES WITH IMIDAZOLES HAVING A SECONDARY AMINO GROUP IN THE RING ARE EXCELLENT LATENT CURING AGENTS FOR EPOXY RESINS AND ACCELERATORS FOR ANHYDRIDE CURING OF POLYEPOXIDES.
Inventors
- 👤 C Klaren
- 👤 H Krak
- 👤 F Jeanno
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 05:05
CPC Classifications
C; C07; C07D; C07D235/00; C07D235/02; C07D235/04; C07D235/06; C07D231/00; C07D231/02; C07D231/10; C07D231/12; C07D233/00; C07D233/54; C07D233/56; C07D235/08; C07D235/24; C07D249/00; C07D249/02; C07D249/08; C08; C08G; C08G59/00; C08G59/18; C08G59/182; C08G59/184; C08G59/40; C08G59/50; C08G59/5093
Claims Analysis
Total Claims: 0
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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) | 1976-09-03 | 1977-03-05 | 1977-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-03 | 1981-03-05 | 1981-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-03 | 1985-03-05 | 1985-09-04 | $7700.00 | Window Closed / Lapsed |