US2908690A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of phthalocyanine pigments
Assignee: EIDP Inc
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Filing: 1955-11-29
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Granted: 1959-10-13
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Expires: 1975-11-29
Abstract
No abstract record available.
Inventors
- 👤 Joseph H Cooper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:54
CPC Classifications
C; C09; C09B; C09B67/00; C09B67/0001; C09B67/0022; C09B67/0023; C09B67/0025; C09B67/0026
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
95 words
IN A PROCESS FOR PRODUCING A PHTHALOCYANINE PIGMENT IN THE BETA CRYSTAL PHASE BY SALT MILLING IN THE PRESENCE OF A CRYSTALLIZING SOLVENT, THE IMPROVEMENT WHICH COMPISES SALT MILLING A PHTHALOCYANINE CAPABLE OF EXISTING IN THE BETA CRYSTAL PHASE AT TEMPERATURES RANGING FROM 100-140* C., AND IN THE PRESENCE OF A CRYSTALLIZING SOLVENT IN AN AMOUNT WHICH PERMITS THE GRINDING MASS TO RETAIN THE CHARACTERISTICS OF DRY POWDER AND ABOVE 15% BASED ON THE WEIGHT OF THE PHTHALOCYANINE, REMOVING THE SALT AND THE CRYSTALLIZING SOLVENT, AND RECOVERING THE PHTHALOCYANINE PIGMENT IN THE BETA CRYSTAL PHASE.
Claim 2
Dependent Claim
95 words
IN A PROCESS FOR PRODUCING A PHTHALOCYANINE PIGMENT IN THE BETA CRYSTAL PHASE BY SALT MILLING IN THE PRESENCE OF A CRYSTALLIZING SOLVENT, THE IMPROVEMENT WHICH COMPISES SALT MILLING A PHTHALOCYANINE CAPABLE OF EXISTING IN THE BETA CRYSTAL PHASE AT TEMPERATURES RANGING FROM 100-140* C., AND IN THE PRESENCE OF A CRYSTALLIZING SOLVENT IN AN AMOUNT WHICH PERMITS THE GRINDING MASS TO RETAIN THE CHARACTERISTICS OF DRY POWDER AND ABOVE 15% BASED ON THE WEIGHT OF THE PHTHALOCYANINE, REMOVING THE SALT AND THE CRYSTALLIZING SOLVENT, AND RECOVERING THE PHTHALOCYANINE PIGMENT IN THE BETA CRYSTAL PHASE.
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) | 1962-10-12 | 1963-04-13 | 1963-10-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-10-12 | 1967-04-13 | 1967-10-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-10-12 | 1971-04-13 | 1971-10-13 | $7700.00 | Window Closed / Lapsed |