US3558529A
Expired / Lapsed
US
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Urethane polymers having improved stiffness-temperature properties
Assignee: Union Carbide Corp
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Filing: 1967-05-03
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Granted: 1971-01-26
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Expires: 1987-05-03
Abstract
Abstract URETHANE POLYMERS ARE PRODUCED FROM A MIXTURE OF INCOMPATIBLE POLYOLS. THE MIXTURE CONTAINS AT LEAST ONE LOW MOLECULAR WEIGHT POLYOL HAVING A HYDROXYL NUMBER OF FROM ABOUT 420 TO ABOUT 640 AND AT LEAST ONE HIGH MOLECULAR WEIGHT POLYOL HAVING A HYDROXYL NUMBER OF FROM ABOUT 34 TO 56; THE RATIO OF HYDROXYL NUMBERS OF THE POLYOLS IN THE MIXTURE BEING AT LEAST 10:1. THE URETHANE POLYMERS ARE USEFUL AS CRASH PADDING, INSULATION, ETC.
Inventors
- 👤 Robert D Whitman
- 👤 Frederick P Reding
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:07
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/65; C08G18/66; C08G18/6666; C08G18/667; C08G18/6674; C08G18/40; C08G18/48; C08G18/4804; C08G18/6696; C08G2130/00
Claims Analysis
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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) | 1974-01-25 | 1974-07-27 | 1975-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-25 | 1978-07-27 | 1979-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-25 | 1982-07-27 | 1983-01-26 | $7700.00 | Window Closed / Lapsed |