Patent US4797749A successfully refreshed from Google Patents.
US3676495A
Expired / Lapsed
US
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2,4-bis(4-aminocyclohexylmethyl)cyclohexylamine
Assignee: EIDP Inc
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Filing: 1970-09-16
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Granted: 1972-07-11
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Expires: 1990-09-16
Abstract
Abstract The triamine 2,4-bis(aminocyclohexylmethyl)cyclohexylamine is prepared by hydrogenation of 2,4-bis(p-aminobenzyl)aniline. The hydrogenated triamine is an intermediate for preparing the corresponding triisocyanate, which in-turn is useful in the preparation of polyurethane materials.
Inventors
- 👤 Guenther Kurt Hoeschele
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 02:45
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/10; C08G18/70; C08G18/72; C08G18/74; C08G18/75; C08G18/758
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-11 | 1976-01-10 | 1976-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-11 | 1980-01-10 | 1980-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-11 | 1984-01-10 | 1984-07-11 | $7700.00 | Window Closed / Lapsed |