Patent US3743667A successfully refreshed from Google Patents.
US3743667A
Expired / Lapsed
US
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Alicyclic nitriles
Assignee: Bayer AG
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Filing: 1972-01-27
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Granted: 1973-07-03
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Expires: 1992-01-27
Abstract
Abstract NOVEL ALDIMINES AND KETIMINES WHICH CONTAIN HYDROXYMEHTYL GROUPS ARE PROVIDED. THESE NEW COMPOUNDS ARE PREPARED BY REACTING SCHIFF''S BASES WHICH HAVE ACTIVE HYDROGEN ATOMS IN A-POSITION TO THE $C=N-GROUP WITH SOLVENTS ARE REQUIRED. THE REACTION PROCEEDS EXOTHERMICALLY AT TEMPERATURES AS LOW AS 0*C. AND THE PROCESS MAY ING AGENTS FOR THE PREPARATION OF POLYURETHANE PLASTICS.
Inventors
- 👤 K Wagner
- 👤 M Hajek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:13
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/65; C08G18/6505; C08G18/6523; C08G18/6535; C08G18/08; C08G18/10; C08G18/30; C08G18/32; C08G18/3271; C08G18/3296
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) | 1976-07-02 | 1977-01-01 | 1977-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-02 | 1981-01-01 | 1981-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-02 | 1985-01-01 | 1985-07-03 | $7700.00 | Window Closed / Lapsed |