Patent US3030370A successfully refreshed from Google Patents.
US3030370A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Particle size reduction of quinacridone and phthalocyanine pigments
Assignee: EIDP Inc
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Filing: 1959-08-24
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Granted: 1962-04-17
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Expires: 1979-08-24
Abstract
No abstract record available.
Inventors
- 👤 Jackson Julius
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:46
CPC Classifications
C; C09; C09B; C09B67/00; C09B67/0032
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
112 words
IN A PROCESS FOR PRODUCING A PIGMENT SELECTED FROM THE GROUP CONSISTING OF PHTHALOCYANINES HAVING THE PIGMENT CHARACTERISTICS OF THE BETA CRYSTAL PHASE AND QUINACRIDONE PIGMENTS BY SALT MILLING SAID PIGMENT IN THE PRESENCE OF A CRYSTALLIZING SOLVENT, THE IMPROVEMENT WHICH COMPRISES MILLING SAID PIGMENT WITH ALUMINUM SULFATE HAVING AT LEAST 7 MOLS OF WATER OF CRYSTALLIZATION, SAID MILING BEING CONDUCTED IN THE PRESENCE OF A CRYSTALLIZING SOLVENT IN AN AMOUNT WHICH PERMITS THE GRINDING MASS TO RETAIN THE CHARACTERISTICS OF A DRY POWDER AND ABOVE 10% BASED ON THE WEIGHT OF THE PIGMENT, REMOVING THE ALUMINUM SULFATE AND CRYSTALLIZING SOLVENT FROM THE PIGMENT, AND RECOVERING A PIGMENT OF REDUCED PARTICLES SIZE.
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) | 1965-04-16 | 1965-10-16 | 1966-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-04-16 | 1969-10-16 | 1970-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-04-16 | 1973-10-16 | 1974-04-17 | $7700.00 | Window Closed / Lapsed |