US3761452A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Epoxy polyurethane prepolymer compositions which are self curing uponapplication of heat
Assignee: Uniroyal Chemical Co Inc
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Filing: 1968-02-16
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Granted: 1973-09-25
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Expires: 1988-02-16
Abstract
Abstract A HEAT CURABLE POLYURETHANE PREPOLYMER PREPARED BY REACTING (A) A POLYOL, (B) AN EXCESS OF AN ORGANIC POLYISOCYANATE, AND (C) ABOUT (B-A)/2 EQUIVALENTS OF A 2,3-EPOXYALCOHOL WHEREIN B AND A REPRESENT THE NUMBER OF EQUIVALENTS OF THE B AND A COMPONENTS USED. CURED POLYURETHANES PREPARED BY HEATING THE AFOREMENTIONED PREPOLYMERS ARE ALSO DISCLOSED.
Inventors
- 👤 R Dawson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 04:49
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/2805; C08G18/2815; C08G18/2845; C08G18/08; C08G18/10
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) | 1976-09-24 | 1977-03-26 | 1977-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-24 | 1981-03-26 | 1981-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-24 | 1985-03-26 | 1985-09-25 | $7700.00 | Window Closed / Lapsed |