US3894014A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of oxazine dyes
Assignee: BASF SE
•
Filing: 1973-02-26
•
Granted: 1975-07-08
•
Expires: 1993-02-26
Abstract
Abstract The production of basic oxazine dyes by the reaction of 3alkoxy-4-azoaniline derivatives with meta-aminophenols in the presence of acidic condensing agents.
Inventors
- 👤 Hans Baumann
- 👤 Udo Mayer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 04:35
CPC Classifications
C; C09; C09B; C09B19/00
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
12 words
A PROCESS FOR THE PRODUCTION OF AN OXIZINE DYE OF THE FORMULA:
Claim 2
Dependent Claim
12 words
A PROCESS FOR THE PRODUCTION OF AN OXIZINE DYE OF THE FORMULA:
Claim 3
Dependent Claim
20 words
A process as claimed in claim 1 wherein the diazo component D is derived from an aniline or aminonaphthaline compound.
Claim 4
Dependent Claim
17 words
A process as claimed in claim 1 carried out in an organic solvent with or without water.
Claim 5
Dependent Claim
17 words
A process as claimed in claim 1 carried out a temperature of from about 80* to 130*C.
Claim 6
Dependent Claim
20 words
A process as claimed in claim 1 carried out at a temperature 10*C above that at which the reaction starts.
Claim 7
Dependent Claim
15 words
A process as claimed in claim 1 wherein the oxazine dye produced has the formula:
Claim 8
Dependent Claim
26 words
A process as claimed in claim 6 wherein the process is carried out in an organic solvent at a temperature of from about 80* to 130*C.
Claim 9
Dependent Claim
28 words
A process as claimed in claim 1 wherein the reaction is accelerated by adding a reducing agent selected from the froup consisting of zinc dust and sodium dithionate.
Claim 10
Dependent Claim
28 words
A process as claimed in claim 6 wherein the reaction is accelerated by adding a reducing agent selected from the group consisting of zinc dust and sodium dithionate.
Claim 11
Dependent Claim
31 words
A process as claimed in claim 1 wherein D is selected from the group consisting of phenyl, 4-methylphenyl, 4-chlorophenyl, 5-chloro-2-methoxy-phenyl, phenyl-2-sulfonic acid, phenyl-4-sulfonic acid, 4-methylphenyl-2-sulfonic acid, 1-naphthyl-5-sulfonic acid and 2-naphthyl-4,8-disulfonic acid.
Claim 12
Dependent Claim
31 words
A process as claimed in claim 6 wherein D is selected from the group consisting of phenyl, 4-methylphenyl, 4-chlorophenyl, 5-chloro-2-methoxy-phenyl, phenyl-2-sulfonic acid, phenyl-4-sulfonic acid, 4-methylphenyl-2-sulfonic acid, 1-naphthyl-5-sulfonic acid and 2-naphthyl-4,8-disulfonic acid.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-07-07 | 1979-01-06 | 1979-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-07 | 1983-01-06 | 1983-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-07 | 1987-01-06 | 1987-07-08 | $7700.00 | Window Closed / Lapsed |