US3671281A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pyrazolone red pigment and process therefor
Assignee: GAF Corp
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Filing: 1970-09-16
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Granted: 1972-06-20
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Expires: 1990-09-16
Abstract
Abstract AN IMPROVED RED PIGMENT IS OBTAINED BY HEATING A COMMERICALLY AVAILABLE PIGMENT OF THE FORMULA: 3,3''-DI(CL),4,4''-BIS((1-PHENYL,3-(H5C2-OOC-),5-(HO-) PYRAZOL-4-YL)-N=N-)BIPHENYL IN AN AROMATIC WATER-INSOLUBLE LIQUID BOILING IN A RANGE OF 80* TO 250*C. FOR A PERIOD OF ABOUT 0.75 TO 12 HOURS AND THEN STRIPPING THE LIQUID FROM THE SOLID. THE RESULTANT PIGMENT IS BLUER, BRIGHTER, STRONGER, AND BOTH MORE BLEED RESISTANT AND THERMALLY STABLE THAN THE ORIGINAL PIGMENT STARTING MATERIAL. THE IMPROVED PIGMENT THUS OBTAINED IS USEFUL IN RUBBER, PLASTICS, PRINTING INKS, LACQUERS, PAINT EMULSION AND TEXTILE PRINTING.
Inventors
- 👤 Nagib A Doss
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:03
CPC Classifications
C; C09; C09B; C09B35/00; C09B35/02; C09B35/039; C09B35/08; C09B35/10; C09B67/00; C09B67/0001; C09B67/0014; C09B67/0015; C09B67/0025; C09B67/0028
Claims Analysis
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-20 | 1975-12-20 | 1976-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-20 | 1979-12-20 | 1980-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-20 | 1983-12-20 | 1984-06-20 | $7700.00 | Window Closed / Lapsed |