Patent US3983092A successfully refreshed from Google Patents.
US3983092A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phenylindane diamine mixture and epoxy resin therewith
Assignee: Novartis Corp
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Filing: 1975-01-20
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Granted: 1976-09-28
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Expires: 1995-01-20
Abstract
Abstract A mixture of phenylindane diamines is prepared by a process comprising acid-catalyzed dimerization of α-methylstyrene and subsequent nitration and reduction of the phenylindane reaction product. This phenylindane diamine mixture is useful in polymide polymers and as a curing agent for epoxy resins.
Inventors
- 👤 John Bateman
- 👤 David A. Gordon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 00:44
CPC Classifications
C; C08; C08G; C08G59/00; C08G59/18; C08G59/40; C08G59/50; C08G59/5033
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
19 words
A phenylindane diamine mixture having the formula ##SPC3## said mixture comprising 15 to 50% 5-amino-1-(4'-aminophenyl)-1,3,3-trimethylindane and 85 to 50%
Claim 2
Dependent Claim
19 words
A phenylindane diamine mixture having the formula ##SPC3## said mixture comprising 15 to 50% 5-amino-1-(4'-aminophenyl)-1,3,3-trimethylindane and 85 to 50%
Claim 3
Dependent Claim
13 words
A mixture according to claim 1 comprising approximately 38% 5-amino-1-(4'-aminophenyl)-1,3,3-trimethylindane and approximately 62%
Claim 4
Dependent Claim
21 words
A composition of matter which is comprised of (a) an epoxy resin and (b) the phenylindane diamine mixture of claim 1.
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) | 1979-09-28 | 1980-03-29 | 1980-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-09-28 | 1984-03-29 | 1984-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-09-28 | 1988-03-29 | 1988-09-28 | $7700.00 | Window Closed / Lapsed |