Patent US2949431A successfully refreshed from Google Patents.
US2949431A
Expired / Lapsed
US
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Preparation of cellular polyurethanes using piperazine catalysts
Assignee: Bayer Corp
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Filing: 1957-07-17
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Granted: 1960-08-16
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Expires: 1977-07-17
Abstract
No abstract record available.
Inventors
- 👤 J W Britain
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:33
CPC Classifications
C; C07; C07D; C07D295/00; C07D295/04; C07D295/12; C07D295/125; C07D295/13; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/16; C08G18/18; C08G18/20; C08G18/2009; C08G18/2027
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
83 words
IN A METHOD FOR MAKING CELLULAR POLYURETHANE PLASTICS COMPRISING MIXTING A POLYALKYLENE ETHER GLYCOL HAVING A MOLECULAR WEIGHT OF AT LEAST ABOUT 500 AND AN HYDROXYL NUMBER OF AT LEAST ABOUT 15, AN EXCESS OF AN ORGANIC POLYISOCYNATE OVER THAT REQUIRED TO RECT WITH ALL OF THE HYDROXYL GROUPS OF THE SAID GLYCOL, AND WATER, AND EFFECTING CHEMICAL REACTION TO PRODUCE A CELLULAR POLYURETHANE PLASTIC, THE IMPROVEMENT WHICH COMPRISES INCLUDING IN THE REACTION MIXTURE A CATALYTIC AMOUNT OF A CATALYST HAVING THE FORMULA:
Claim 2
Dependent Claim
83 words
IN A METHOD FOR MAKING CELLULAR POLYURETHANE PLASTICS COMPRISING MIXTING A POLYALKYLENE ETHER GLYCOL HAVING A MOLECULAR WEIGHT OF AT LEAST ABOUT 500 AND AN HYDROXYL NUMBER OF AT LEAST ABOUT 15, AN EXCESS OF AN ORGANIC POLYISOCYNATE OVER THAT REQUIRED TO RECT WITH ALL OF THE HYDROXYL GROUPS OF THE SAID GLYCOL, AND WATER, AND EFFECTING CHEMICAL REACTION TO PRODUCE A CELLULAR POLYURETHANE PLASTIC, THE IMPROVEMENT WHICH COMPRISES INCLUDING IN THE REACTION MIXTURE A CATALYTIC AMOUNT OF A CATALYST HAVING THE FORMULA:
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) | 1963-08-16 | 1964-02-15 | 1964-08-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-08-16 | 1968-02-15 | 1968-08-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-08-16 | 1972-02-15 | 1972-08-16 | $7700.00 | Window Closed / Lapsed |