US3784583A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Latent organic phosphonium salt catalysts for curing glycidyl ether epoxy resins
Assignee: Westinghouse Electric Corp
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Filing: 1971-10-14
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Granted: 1974-01-08
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Expires: 1991-10-14
Abstract
Abstract A RESINOUS COMPOSITION, SUITABLE FOR INSULATING ELECTRICAL MEMBERS, IS MADE FROM A MIXTURE CONTAINING ABOUT 90 TO 120 PARTS OF GLYCIDYL ETHER EPOXY RESIN, ABOUT 130 TO 165 PARTS OF AN ACID ANHYDRIDE AND ABOUT 0.02 TO 0.70 PART OF A QUATERNARY ORGANIC PHOSPHONIUM SALT ACTING AS A LATENT CATALYST.
Inventors
- 👤 J Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 08:04
CPC Classifications
H; H01; H01B; H01B3/00; H01B3/18; H01B3/30; H01B3/40; C; C08; C08G; C08G59/00; C08G59/18; C08G59/40; C08G59/42; C08G59/68; C08G59/688
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) | 1977-01-07 | 1977-07-09 | 1978-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-07 | 1981-07-09 | 1982-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-07 | 1985-07-09 | 1986-01-08 | $7700.00 | Window Closed / Lapsed |