Patent US3816339A successfully refreshed from Google Patents.
US3816339A
Expired / Lapsed
US
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Urethane catalyst
Assignee: Air Products and Chemicals Inc
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Filing: 1972-02-22
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Granted: 1974-06-11
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Expires: 1992-02-22
Abstract
Abstract A new catalyst for the acceleration of urethane polymerization consisting of a mixture of N,N-dimethyl-cyclohexyl-amine and Nmethyl-dicyclohexylamine has been found. The new mixture has unique characteristics that are not expected from its components taken alone.
Inventors
- 👤 D Raden
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:16
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/16; C08G18/18; C08G18/1816
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
13 words
The catalyst of claim 1 wherein said ratio is between 1:3 and 3:1.
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) | 1977-06-10 | 1977-12-10 | 1978-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-10 | 1981-12-10 | 1982-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-10 | 1985-12-10 | 1986-06-11 | $7700.00 | Window Closed / Lapsed |