US3654331A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dianilino aluminum chloride
Assignee: Ethyl Corp
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Filing: 1968-12-10
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Granted: 1972-04-04
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Expires: 1988-12-10
Abstract
Abstract AROMATIC AMINES HAVING A HYDROGEN ATOM ON AT LEAST ONE NUCLEAR CARBON ATOMS ORTHO TO AN AMINE GROUP (E.G., ANILINE) ARE SELECTIVELY ORTHOALKYLATED BY ADDING A CATALYTIC AMOUNT OF AN ALKYL ALUMINUM HALIDE SUCH AS DIETHYL ALUMINUM CHLORIDE TO THE AROMATIC AMINE AND THEN HEATING THE RESTULANT MIXTURE TO ABOUT 100-500*C IN THE PRESENCE OF AN OLEFIN. THE PROCESS MAY ALSO BE CARRIED OUT IN THE ADDED PRESENCE OF AN ALUMINUM ANILIDE.
Inventors
- 👤 Oskar E H Klopfer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 05:13
CPC Classifications
C; C07; C07C; C07C209/00; C07C209/68
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) | 1975-04-04 | 1975-10-04 | 1976-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-04 | 1979-10-04 | 1980-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-04 | 1983-10-04 | 1984-04-04 | $7700.00 | Window Closed / Lapsed |