US3268488A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Urethane prepolymer from a mixture of a polyether glycol and a polyhydric alcohol
Assignee: Bayer Corp
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Filing: 1965-06-01
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Granted: 1966-08-23
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Expires: 1985-06-01
Abstract
No abstract record available.
Inventors
- 👤 Herbert L Heiss
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:27
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/10; C08G18/12; C08G18/28; C08G18/65; C08G18/66; C08G18/6666; C08G18/667; C08G18/6674; C08G18/6677
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
113 words
A PROCESS FOR PREPARING A PREPOLYMER CONTAINING URETHANE LINKAGES AND HAVING TERMINAL -NCO GROUPS WHICH COMPRISES REACTING AN EXCESS OF AN ORGANIC DIISOCYANATE WITH A MIXTURE OF A POLYALKYLENE ETHER GLYCOL HAVING AN AVERAGE MOLECULAR WEIGHT OF AT LEAST ABOUT 350 AND A HYDROXYL NUMBER OF NOT MORE THAN ABOUT 350 A POLYHYDRIC ALCOHOL FREE FROM TERTIRY NITROGEN ATOMS AND HAVING THREE TO SIX HYDROXYL GROUPS AND A MOLECULAR WEIGHT OF NOT MORE THAN ABOUT 500, SAID MIXTURE CONTAINING FROM ABOUT 70% TO ABOUT 99.5% OF THE SAID POLYALKYLENE ETHER GLYCOL AND FROM ABOUT 0.5% TO ABOUT 30% BY WEIGHT OF THE SAID POLYHYDRIC ALCOHOL, SAID REACTION TAKING PLACE UNDER SUBSTANTIALLY ANHYDROUS CONDITIONS.
Claim 2
Dependent Claim
113 words
A PROCESS FOR PREPARING A PREPOLYMER CONTAINING URETHANE LINKAGES AND HAVING TERMINAL -NCO GROUPS WHICH COMPRISES REACTING AN EXCESS OF AN ORGANIC DIISOCYANATE WITH A MIXTURE OF A POLYALKYLENE ETHER GLYCOL HAVING AN AVERAGE MOLECULAR WEIGHT OF AT LEAST ABOUT 350 AND A HYDROXYL NUMBER OF NOT MORE THAN ABOUT 350 A POLYHYDRIC ALCOHOL FREE FROM TERTIRY NITROGEN ATOMS AND HAVING THREE TO SIX HYDROXYL GROUPS AND A MOLECULAR WEIGHT OF NOT MORE THAN ABOUT 500, SAID MIXTURE CONTAINING FROM ABOUT 70% TO ABOUT 99.5% OF THE SAID POLYALKYLENE ETHER GLYCOL AND FROM ABOUT 0.5% TO ABOUT 30% BY WEIGHT OF THE SAID POLYHYDRIC ALCOHOL, SAID REACTION TAKING PLACE UNDER SUBSTANTIALLY ANHYDROUS CONDITIONS.
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) | 1969-08-22 | 1970-02-21 | 1970-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-08-22 | 1974-02-21 | 1974-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-08-22 | 1978-02-21 | 1978-08-23 | $7700.00 | Window Closed / Lapsed |