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US4024185A
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Cycloaliphatic unsymmetrical diamines
Assignee: Honeywell International Inc
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Filing: 1974-12-04
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Granted: 1977-05-17
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Expires: 1994-12-04
Abstract
Abstract Novel cycloaliphatic diamines have been prepared which are consisting of two unequivalent amine groups. The diamines are prepared by reduction of aromatic dinitro compounds. The polyamides made from these diamines are useful in forming fibers and films having excellent high temperature properties.
Inventors
- 👤 Lester T. C. Lee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 00:52
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/02; C08G69/26
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
22 words
A compound having the formula: ##STR5## which comprises substantially trans-isomer and wherein A is p-cycloaliphatic radical having 6 to 15 carbon atoms.
Claim 2
Dependent Claim
22 words
A compound having the formula: ##STR5## which comprises substantially trans-isomer and wherein A is p-cycloaliphatic radical having 6 to 15 carbon atoms.
Claim 3
Dependent Claim
10 words
The compound of claim 1 wherein the compound is trans-2-(4-aminocyclohexyl)-1,1-dimethylethylamine.
Claim 4
Dependent Claim
10 words
The compound of claim 1 wherein the compound is cis-2-(4-aminocyclohexyl)-1,1-dimethylethylamine.
Claim 5
Dependent Claim
10 words
The compound of claim 1 wherein the compound is 1-[4-aminocyclohexyl]-1-[4-(2-amino-2-methylpropyl)cyclohexyl]methane.
Claim 6
Dependent Claim
10 words
The compound of claim 1 wherein the compound is 2-[4-aminocyclohexyl]-2-[4-(2-amino-2-methylpropyl)cyclohexyl]propane.
References Cited (Backward Citations)
US2461495A
Cited
US2512606A
Cited
US2606928A
Cited
GB681688A
Cited
US3117992A
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US3697594A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-05-16 | 1980-11-15 | 1981-05-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-16 | 1984-11-15 | 1985-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-16 | 1988-11-15 | 1989-05-17 | $7700.00 | Window Closed / Lapsed |