US3207709A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of cellular polyurethane plastics
Assignee: Bayer AG
•
Filing: 1959-09-02
•
Granted: 1965-09-21
•
Expires: 1979-09-02
Abstract
No abstract record available.
Inventors
- 👤 Merten Rudolf
- 👤 Muller Gerhard
- 👤 Windemuth Erwin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:44
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/42; C08G18/4244; C08G18/4247; C08G18/4252
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
86 words
A PROCESS FOR THE PRODUCTION OF A CELLULAR POLYURETHANE WHICH COMPRISES SIMULTANEOUSLY MIXING AN ORGANIC POLYISOCYANATE WITH A POLYESTER HAVING TERMINAL HYDROXYL GROUPS IN THE PRESENCE OF A FOAMING AGENT, SAID POLYESTER PREPARED BY REACTING AN EXCESS OF A POLYDRIC ALCOHOL WITH A POLYCRBOXYLIC ACID, SAID POLYHYDRIC ALCOHOL COMPRISING FROM ABOUT 2 EQUIVALENT PERCENT TO ABOUT 15 EQUIVALENT PERCENT POLYPROPYLENE ETHER GLYCOL BASED ON THE TOTAL ALCOHOL QUANTITY OF SAID POLYESTER, SAID POLYPROPYLENE ETHER GLYCOL HAVING A MOLECULAR WEIGHT OF FROM ABOUT 500 TO ABOUT 1750.
Claim 2
Dependent Claim
86 words
A PROCESS FOR THE PRODUCTION OF A CELLULAR POLYURETHANE WHICH COMPRISES SIMULTANEOUSLY MIXING AN ORGANIC POLYISOCYANATE WITH A POLYESTER HAVING TERMINAL HYDROXYL GROUPS IN THE PRESENCE OF A FOAMING AGENT, SAID POLYESTER PREPARED BY REACTING AN EXCESS OF A POLYDRIC ALCOHOL WITH A POLYCRBOXYLIC ACID, SAID POLYHYDRIC ALCOHOL COMPRISING FROM ABOUT 2 EQUIVALENT PERCENT TO ABOUT 15 EQUIVALENT PERCENT POLYPROPYLENE ETHER GLYCOL BASED ON THE TOTAL ALCOHOL QUANTITY OF SAID POLYESTER, SAID POLYPROPYLENE ETHER GLYCOL HAVING A MOLECULAR WEIGHT OF FROM ABOUT 500 TO ABOUT 1750.
References Cited (Backward Citations)
US2275494A
Cited
GB682866A
Cited
DE929507C
Cited
US2744087A
Cited
GB773897A
Cited
US2866774A
Cited
US2894919A
Cited
US2779689A
Cited
US3079350A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-09-20 | 1969-03-22 | 1969-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-09-20 | 1973-03-22 | 1973-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-09-20 | 1977-03-22 | 1977-09-21 | $7700.00 | Window Closed / Lapsed |