Patent US4611045A successfully refreshed from Google Patents.
US4611045A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Monoalkylation of 1-alkyl-diaminobenzenes
Assignee: Ethyl Corp
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Filing: 1984-02-27
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Granted: 1986-09-09
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Expires: 2004-02-27
Abstract
Abstract A process for monoalkylating 1-alkyl-2,4-diaminobenzene or 1-alkyl-2,6-diaminobenzene. Propylene is reacted with 2,4-diaminotoluene in the presence of aluminum anilide catalyst. Aniline is an optional ingredient. 1-Methyl-2,6-diamino-3-isopropylbenzene is a new compound: ##STR1##
Inventors
- 👤 Kryn G. Ihrman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:56
CPC Classifications
C; C07; C07C; C07C209/00; C07C209/68
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
34 words
A polyurethane formed by reacting an organic polyol, an organic polyisocyanate, and a chain extender comprising the compound 1-methyl-2,6-diamino-3-isopropylbenzene in the presence of a catalyst for the reaction of the polyisocyanate and the polyol.
Claim 2
Dependent Claim
34 words
A polyurethane formed by reacting an organic polyol, an organic polyisocyanate, and a chain extender comprising the compound 1-methyl-2,6-diamino-3-isopropylbenzene in the presence of a catalyst for the reaction of the polyisocyanate and the polyol.
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) | 1989-09-08 | 1990-03-10 | 1990-09-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-09-08 | 1994-03-10 | 1994-09-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-09-08 | 1998-03-10 | 1998-09-09 | $7700.00 | Window Closed / Lapsed |