Patent US4148146A successfully refreshed from Google Patents.
US3674852A
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Process for preparing mesidine
Assignee: Imperial Chemical Industries Ltd
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Filing: 1969-05-19
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Granted: 1972-07-04
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Expires: 1989-05-19
Abstract
Abstract Manufacture of mesidine by isomerization of N,N-dimethyl otoluidine or -p-toluidine at above 200* C. preferably in presence of a primary or secondary amine as reaction moderator and (when nonferrous lined apparatus is used) in presence of iron or a salt of iron.
Inventors
- 👤 Frederick John Averill
- 👤 Norman Riley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 13:21
CPC Classifications
C; C07; C07C; C07C209/00; C07C209/62
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
12 words
Process according to claim 1 wherein the zinc halide is zinc chloride.
Claim 2
Dependent Claim
20 words
Process according to claim 1 wherein the proportion of halide is 0.1 to 0.75 moles per mole of toluidine derivative.
Claim 3
Dependent Claim
21 words
Process according to claim 2 wherein the proportion of zinc chloride is 0.1 to 0.75 mole per mole of toluidine derivative.
Claim 4
Dependent Claim
30 words
Process according to claim 1 carried out in the presence of aniline, N-methyaniline, p-toluidine, 2,4-dimethylaniline or N-methyl-2,4-dimethyl-aniline in a proportion of 0.1 to 0.5 mole per mole of toluidine derivative.
Claim 5
Dependent Claim
30 words
Process according to claim 2 carried out in the presence of aniline, N-methylaniline, p-toluidine, 2,4-dimethylaniline or N-methyl-2,4-dimethyl-aniline in a proportion of 0.1 to 0.5 mole per mole of toluidine derivative.
Claim 6
Dependent Claim
30 words
Process according to claim 3 carried out in the presence of aNiline, N-methylaniline, p-toluidine, 2,4-dimethylaniline or N-methyl-2,4-dimethyl-aniline in a proportion of 0.1 to 0.5 mole per mole of toluidine derivative.
Claim 7
Dependent Claim
30 words
Process according to claim 4 carried out in the presence of aniline, N-methylaniline, p-toluidine, 2,4-dimethylaniline or N-methyl-2,4-dimethyl-aniline in a proportion of 0.1 to 0.5 mole per mole of toluidine derivative.
References Cited (Backward Citations)
US3123644A
Cited
US2039391A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-04 | 1976-01-03 | 1976-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-04 | 1980-01-03 | 1980-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-04 | 1984-01-03 | 1984-07-04 | $7700.00 | Window Closed / Lapsed |