US2767166A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of chromed azo dyes derived from an anisidine
Assignee: GAF Chemicals Corp
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Filing: 1952-01-31
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Granted: 1956-10-16
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Expires: 1972-01-31
Abstract
No abstract record available.
Inventors
- 👤 Albert F Strobel
- 👤 William W Williams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:02
CPC Classifications
C; C09; C09B; C09B45/00; C09B45/02; C09B45/14; C09B45/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
113 words
IN A PROCESS FOR THE CHROMATION OF METALLIZABLE AZO DYESTUFFS, DERIVED FROM A DIAZOTIZED O-ANBIDINE COMPOUND AND A COUPLING COMPONENT SELECTED FROM THE GROUP CONSISTING OF 1-PHENYL-3-METHYL-5-PYRAZOLENE NAPHTHYLAMINE-5-SULFONIC ACID, BY REACTION OF SAID AZO DYE WITH A TRIVALENT CHROMIUM SALT IN AN INERT ORGANIC SOLVENT, AND AT AN ELEVATED TEMPERATURE WHICH IS BELOW THE DECOMPOSITION TEMPERATURE OF THE SAID DYESTUFF; THE IMPROVEMENT WHICH COMPRISES EFFECTING SAID REACTION OF SAID AZO DYE WITH SAID CHROMIUM SALT, BY ADDING BY AZO DYE TO AN ESSENTIALLY ANHYDROUS SOLUTION OF SAID TRIVALENT CHROMIUM SALT IN A LOWER CARBOXYLIC ACID AMIDE, AND HEATING THE SAME UNTIL THE CHROMATION IS ESSENTIALLY COMPLETE,AND THEREAFTER RECOVERING THE THUS-OBTAINED CHROMED AZO DYE.
Claim 2
Dependent Claim
113 words
IN A PROCESS FOR THE CHROMATION OF METALLIZABLE AZO DYESTUFFS, DERIVED FROM A DIAZOTIZED O-ANBIDINE COMPOUND AND A COUPLING COMPONENT SELECTED FROM THE GROUP CONSISTING OF 1-PHENYL-3-METHYL-5-PYRAZOLENE NAPHTHYLAMINE-5-SULFONIC ACID, BY REACTION OF SAID AZO DYE WITH A TRIVALENT CHROMIUM SALT IN AN INERT ORGANIC SOLVENT, AND AT AN ELEVATED TEMPERATURE WHICH IS BELOW THE DECOMPOSITION TEMPERATURE OF THE SAID DYESTUFF; THE IMPROVEMENT WHICH COMPRISES EFFECTING SAID REACTION OF SAID AZO DYE WITH SAID CHROMIUM SALT, BY ADDING BY AZO DYE TO AN ESSENTIALLY ANHYDROUS SOLUTION OF SAID TRIVALENT CHROMIUM SALT IN A LOWER CARBOXYLIC ACID AMIDE, AND HEATING THE SAME UNTIL THE CHROMATION IS ESSENTIALLY COMPLETE,AND THEREAFTER RECOVERING THE THUS-OBTAINED CHROMED AZO DYE.
References Cited (Backward Citations)
US2230686A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-10-16 | 1960-04-16 | 1960-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-10-16 | 1964-04-16 | 1964-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-10-16 | 1968-04-16 | 1968-10-16 | $7700.00 | Window Closed / Lapsed |