Patent US3264299A successfully refreshed from Google Patents.
US3264299A
Expired / Lapsed
US
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Quinacridone pigment process
Assignee: Wyeth Holdings LLC
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Filing: 1962-02-27
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Granted: 1966-08-02
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Expires: 1982-02-27
Abstract
No abstract record available.
Inventors
- 👤 Daniel W Thomas
- 👤 William L Berry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 10:47
CPC Classifications
C; C09; C09B; C09B67/00; C09B67/0025; C09B67/0027; C09B48/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
80 words
AN IMPROVED PROCESS OF PREPARING THE YELLOW SHADE CRYSTALLINE FROM OF 2,9-DIMETHYLQUINACRIDONE WHICH COMPRISES TREATING ABOUT ONE PART BY WEIGHT OF A MEMBER SELECTED FROM THE GROUP CONSISTING OF THE DI-LOWER ALKYL ESTERS OF 2,5-D-P-TOLUIDINOTEREPHTHALIC ACID WITH FROM 0.2 TO 1.5 PARTS BY WEIGHT OF A BENZENE SULFONIC ACID CATALYST IN AT LEAST 5 PARTS BY WEIGHT OF A LIQUID CHLORINATED BENZENE SOLVENT AT A TEMPERATURE BETWEEN ABOUT 175* AND 220*C. AND SEPARATING THE YELLOW SHADE RED PIGMENT THUS FORMED.
Claim 2
Dependent Claim
80 words
AN IMPROVED PROCESS OF PREPARING THE YELLOW SHADE CRYSTALLINE FROM OF 2,9-DIMETHYLQUINACRIDONE WHICH COMPRISES TREATING ABOUT ONE PART BY WEIGHT OF A MEMBER SELECTED FROM THE GROUP CONSISTING OF THE DI-LOWER ALKYL ESTERS OF 2,5-D-P-TOLUIDINOTEREPHTHALIC ACID WITH FROM 0.2 TO 1.5 PARTS BY WEIGHT OF A BENZENE SULFONIC ACID CATALYST IN AT LEAST 5 PARTS BY WEIGHT OF A LIQUID CHLORINATED BENZENE SOLVENT AT A TEMPERATURE BETWEEN ABOUT 175* AND 220*C. AND SEPARATING THE YELLOW SHADE RED PIGMENT THUS FORMED.
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) | 1969-08-01 | 1970-01-31 | 1970-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-08-01 | 1974-01-31 | 1974-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-08-01 | 1978-01-31 | 1978-08-02 | $7700.00 | Window Closed / Lapsed |