Patent US2393922A successfully refreshed from Google Patents.
Patent US3734880A successfully refreshed from Google Patents.
US3734880A
Expired / Lapsed
US
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Polyurethane composition and method of its preparation
Assignee: Goodyear Tire and Rubber Co
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Filing: 1972-06-28
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Granted: 1973-05-22
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Expires: 1992-06-28
Abstract
Abstract A POLYURETHANE COMPOSITION RESISTANT TO PHOSPHORIC ACID PREPARED BY FIRST FORMING A PREPOLYMER BY REACTING IS THE PRESENCE OF A 2,6-DIALKYLATED PARA CRESOL A HYDROXYCONTAINING UNSATURATED POLYMERIC POLYOL HAVING A MOLECULAR WEIGHT OF FROM ABOUT 1000 TO ABOUT 5000 AND A HYDROXYL FUNCTIONALITY OF ABOUT 2.1 TO ABOUT 2.8 AND A LIQUID DIPHENYL METHANE DIISOCYANATE FOLLOWED BY CURING SAID PREPOLYMER BY REACTING WITH AN ORGANIC PRIMARY DIAMINE.
Inventors
- 👤 A Finelli
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 14:32
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/10; C08G18/28; C08G18/67; C08G18/69; C08K; C08K5/00; C08K5/04; C08K5/13; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/1352; Y10T428/31504; Y10T428/31551; Y10T428/31605
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 |