Patent US3661808A successfully refreshed from Google Patents.
US3661808A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalyst combination for polyurethanes
Assignee: Texaco Inc
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Filing: 1970-07-31
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Granted: 1972-05-09
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Expires: 1990-07-31
Abstract
Abstract AN EXCELLENT CATALYST FOR POLYURETHANCES IS A COMBINATION OF 4,4''-DIMORPHOLINODIETHYL ETHER AND 1,4-DIMETHYLPIPERAZINE, THE CATALYST COMBINATION, WHICH EXHIBITS A MUCH LOWER VAPOR PRESSURE THAN DIMETHYL PIPERAZINE ALONE, IS USEFUL IN POLYETHER AND POLYESTER FOAMS, URETHANE FOAMS ARE USEFUL N VARIOUS APPLICATIONS RANGING FROM CUSHIONING IN FLEXIBLES TO INSULATION IN RIGIDS.
Inventors
- 👤 William Alvis Kennedy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:26
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/16; C08G18/18; C08G18/20; C08G18/2081
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-09 | 1975-11-08 | 1976-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-09 | 1979-11-08 | 1980-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-09 | 1983-11-08 | 1984-05-09 | $7700.00 | Window Closed / Lapsed |