Patent US2871234A successfully refreshed from Google Patents.
US2871234A
Expired / Lapsed
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Anthraquinone azoic pigments
Assignee: GAF Chemicals Corp
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Filing: 1956-10-16
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Granted: 1959-01-27
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Expires: 1976-10-16
Abstract
No abstract record available.
Inventors
- 👤 Herman A Bergstrom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 21:29
CPC Classifications
C; C09; C09B; C09B43/00; C09B43/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
112 words
IN THE PROCESS OF PRODUCING ANTHRAQUINONE AZOIC PIGMENTS, WHEREIN A WATER-SOLUBLE LEUCO SULFURIC ACID ESTER OF AN ANTHRAQUINONE AZOIC DYESTUFF, FREE OF WATERSOLUBILIZING GROUPS OTHER THAN LEUCO SULFURIC ACID ESTER GROUPS OBTAINED BY COUPLING A DIAZOTIZED LEUCO SULFURIC ACID ESTER OF AN AMINOANTHRAQUINONE FREE OF WATER-SOLUBILIZING GROUPS OTHER THAN THE LEUCO SULFURIC ACID ESTER GROUPS WITH AN AZOIC COUPLER WHICH IS FREE OF WATERSOLUBILIZING GROUPS, IS SUBJECTED, IN AN AQUEOUS MEDIUM, TO THE ACTION OF AN OXIDIZING AGENT; THE IMPROVEMENT WHICH COMPRISES CARRYING OUT SAID OXIDIZING STEP IN THE PRESENCE OF FROM ABOUT 0.001 TO 5% OF THE TOTAL WEIGHT OF THE AQUEOUS MIXTURE BEING OXIDIZED OF A WATER-SOLUBLE POLYMER OF N-VINYL-A-PYRROLIDONE.
Claim 2
Dependent Claim
112 words
IN THE PROCESS OF PRODUCING ANTHRAQUINONE AZOIC PIGMENTS, WHEREIN A WATER-SOLUBLE LEUCO SULFURIC ACID ESTER OF AN ANTHRAQUINONE AZOIC DYESTUFF, FREE OF WATERSOLUBILIZING GROUPS OTHER THAN LEUCO SULFURIC ACID ESTER GROUPS OBTAINED BY COUPLING A DIAZOTIZED LEUCO SULFURIC ACID ESTER OF AN AMINOANTHRAQUINONE FREE OF WATER-SOLUBILIZING GROUPS OTHER THAN THE LEUCO SULFURIC ACID ESTER GROUPS WITH AN AZOIC COUPLER WHICH IS FREE OF WATERSOLUBILIZING GROUPS, IS SUBJECTED, IN AN AQUEOUS MEDIUM, TO THE ACTION OF AN OXIDIZING AGENT; THE IMPROVEMENT WHICH COMPRISES CARRYING OUT SAID OXIDIZING STEP IN THE PRESENCE OF FROM ABOUT 0.001 TO 5% OF THE TOTAL WEIGHT OF THE AQUEOUS MIXTURE BEING OXIDIZED OF A WATER-SOLUBLE POLYMER OF N-VINYL-A-PYRROLIDONE.
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) | 1962-01-26 | 1962-07-28 | 1963-01-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-01-26 | 1966-07-28 | 1967-01-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-01-26 | 1970-07-28 | 1971-01-27 | $7700.00 | Window Closed / Lapsed |