Patent US3081349A successfully refreshed from Google Patents.
US3081349A
Expired / Lapsed
US
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Catalysts for condensation reactions of primary amines with dihydroxy aromatic compounds
Assignee: Goodyear Tire and Rubber Co
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Filing: 1958-07-25
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Granted: 1963-03-12
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Expires: 1978-07-25
Abstract
No abstract record available.
Inventors
- 👤 Ronald B Spacht
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:52
CPC Classifications
B; B01; B01J; B01J37/00; B01J37/04; C; C07; C07C; C07C209/00; C07C209/04; C07C209/14; C07C209/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
23 words
IN THE PROCESS OF PREPARING AROMATIC DIAMINES COMPRISING REACTING (1) FROM TWO TO THREE MOLS OF A PRIMARY AMINE HAVING THE FOLLOWING FORMULA
Claim 2
Dependent Claim
23 words
IN THE PROCESS OF PREPARING AROMATIC DIAMINES COMPRISING REACTING (1) FROM TWO TO THREE MOLS OF A PRIMARY AMINE HAVING THE FOLLOWING FORMULA
References Cited (Backward Citations)
US2041782A
Cited
US2087199A
Cited
US2200747A
Cited
US2111863A
Cited
GB611316A
Cited
US2824137A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-03-11 | 1966-09-10 | 1967-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-03-11 | 1970-09-10 | 1971-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-03-11 | 1974-09-10 | 1975-03-12 | $7700.00 | Window Closed / Lapsed |