Patent US3845098A successfully refreshed from Google Patents.
US3845098A
Expired / Lapsed
US
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Constrained amine catalysts in the production of urethanes
Assignee: Universal Oil Products Co
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Filing: 1973-03-09
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Granted: 1974-10-29
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Expires: 1993-03-09
Abstract
Abstract 1. IN A METHOD FOR THE REACTION OF AN ISCYANATE WITH AN ALCOHOL AT REACTION CONDITIONS, THE IMPROVEMENT WHICH CONSISTS IN THE UTILIZATION OF 4,4''BIS(N-PYROLLIDYL)DIPHENYLMETHANE OR 4,4''-BIS-(N-PIPERIDYL)DIPHENYLMETHANE AS A CATALYST FOR THE REACTION.
Inventors
- 👤 S Massie
- 👤 P Pinke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:23
CPC Classifications
C; C07; C07D; C07D295/00; C07D295/02; B; B01; B01J; B01J31/00; B01J31/02; B01J31/0234; B01J31/0235; B01J31/0237; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/16; C08G18/18; C08G18/20; C08G18/2081
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
32 words
IN A METHOD FOR THE REACTION OF AN ISCYANATE WITH AN ALCOHOL AT REACTION CONDITIONS, THE IMPROVEMENT WHICH CONSISTS IN THE UTILIZATION OF 4,4''BIS(N-PYROLLIDYL)DIPHENYLMETHANE OR 4,4''-BIS-(N-PIPERIDYL)DIPHENYLMETHANE AS A CATALYST FOR THE REACTION.
Claim 2
Dependent Claim
32 words
IN A METHOD FOR THE REACTION OF AN ISCYANATE WITH AN ALCOHOL AT REACTION CONDITIONS, THE IMPROVEMENT WHICH CONSISTS IN THE UTILIZATION OF 4,4''BIS(N-PYROLLIDYL)DIPHENYLMETHANE OR 4,4''-BIS-(N-PIPERIDYL)DIPHENYLMETHANE AS A CATALYST FOR THE REACTION.
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) | 1977-10-28 | 1978-04-29 | 1978-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-28 | 1982-04-29 | 1982-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-28 | 1986-04-29 | 1986-10-29 | $7700.00 | Window Closed / Lapsed |