US3135708A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyurethane plastics and preparation of same
Assignee: Bayer AG
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Filing: 1961-04-18
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Granted: 1964-06-02
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Expires: 1981-04-18
Abstract
No abstract record available.
Inventors
- 👤 Erwin A Muller
- 👤 Becker Wilhelm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:46
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/42; C08G18/46; C08G18/4676; C08G18/60; C08G18/606; C08G18/64; C08G18/6453; C08G18/67; C08G18/68; C08G18/69; C08G18/696
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
118 words
A CELLULAR POLYURETHANE PLASTIC WHICH COMPRISES THE REACTION PRODUCT OF AN ORGANIC POLYISOCYANATE WITH A POLYHYDROXYL COMPOUND CONTAINING FROM ABOUT 2 PERCENT BY WEIGHT TO ABOUT 10 PERCENT BY WEIGHT FREE HYDROXYL GROUPS AS ESSENTIALLY THE SOLE GROUPS THEREOF REACTIVE WITH AN -NCO GROUP, SAID POLYHYDROXYL COMPOUND HAVING BEEN OBTAINED BY A PROCESS WHICH COMPRISES REACTING IN THE PRESENCE OF A BLOWING AGENT AN ORGANIC COMPOUND HAVING A MOLECULAR WEIGHT OF AT LEAST ABOUT 150 AND CONTAINING AT LEAST TWO ETHYLENICALLY UNSATURATED DOUBLE BONDS WITH A MERCAPTAN HAVING AT LEAST ONEFREE PRIMARY HYDROXYL GROUP AND HAVING UP TO ABOUT 7 CARBON ATOMS, SAID ORGANIC COMPOUND SELECTED FROM THE GROUP CONSISTING OF CONJUGATED DIENES AND POLYESTERS CONTAINING ETHYLENIC UNSATURATION.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-06-02 | 1967-12-02 | 1968-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-06-02 | 1971-12-02 | 1972-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-06-02 | 1975-12-02 | 1976-06-02 | $7700.00 | Window Closed / Lapsed |