Patent US3734894A successfully refreshed from Google Patents.
US3734894A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of controlling reaction of polyisocyanate with polyamine
Assignee: Goodyear Tire and Rubber Co
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Filing: 1971-07-01
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Granted: 1973-05-22
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Expires: 1991-07-01
Abstract
Abstract THIS INVENTION RELATES TO A METHOD OF MAKING POLYURETHANE HAVING IMPROVED RESISTANCE TO DICOLORATION, FOR INSTANCE, IN A WEATHEROMETER FOR 100 HOURS. THESE POLYURETHANES ARE PREPARED BY REACTING A REACTIVE HYDROGEN CONTAINING MATERIAL SUCH AS POLYESTERS, POLYETHERS, POLYESTER AMIDES, CASTOR OIL, POLYCARBONATE POLYOLS AND POLYDIENE POLYOLS AND THE HYDROGENATED POLYDIENE POLYOLS WITH A NONAROMATIC ORGANIC POLYISOCYANATE AND A NONAROMATIC PRIMARY DIAMINE IN THE PRESENCE OF SUFFICIENT INERT SOLVENT TO RENDER THE MIXTURE SPREADABLE.
Inventors
- 👤 A Finelli
- 👤 J West
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:10
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/67; C08G18/69; 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) | 1976-05-21 | 1976-11-20 | 1977-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-21 | 1980-11-20 | 1981-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-21 | 1984-11-20 | 1985-05-22 | $7700.00 | Window Closed / Lapsed |