Patent US2770629A successfully refreshed from Google Patents.
US2770629A
Expired / Lapsed
US
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Preparation of phthalocyanine pigments
Assignee: Wyeth Holdings LLC
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Filing: 1952-01-08
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Granted: 1956-11-13
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Expires: 1972-01-08
Abstract
No abstract record available.
Inventors
- 👤 John W Eastes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:19
CPC Classifications
C; C09; C09B; C09B67/00; C09B67/0001; C09B67/0017; C09B67/0019; C09B67/0025; C09B67/0026
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
67 words
THE METHOD OF PRODUCING A FINELY-DIVIDED, TINCTORIALLY STRONG, NON-CRYSTALLIZING, RED SHADE, BETA FORM METAL PHTHALOCYANINE CRUDE PIGMENT PREPARED IN AN AUTOA PHTHALOCYANINE PIGMENT WHICH COMPRISES SLURRYING CLAVE IN A SATURATED ALICYCLIC HYDROCARBON SOLVENT, IN AN AQUEOUS MEDIUM COMPRISING SULFURIC ACID, THE SULFURIC ACID CONCENTRATION BEING BETWEEN ABOUT 62.5% AND ABOUT 80% DROWNING THE PIGMENT-ACID SLURRY IN WATER, SEPARATING THE PIGMENT, AND NEUTRALIZING ACID REMAINING IN THE PIGMENT.
Claim 2
Independent Claim
67 words
THE METHOD OF PRODUCING A FINELY-DIVIDED, TINCTORIALLY STRONG, NON-CRYSTALLIZING, RED SHADE, BETA FORM METAL PHTHALOCYANINE CRUDE PIGMENT PREPARED IN AN AUTOA PHTHALOCYANINE PIGMENT WHICH COMPRISES SLURRYING CLAVE IN A SATURATED ALICYCLIC HYDROCARBON SOLVENT, IN AN AQUEOUS MEDIUM COMPRISING SULFURIC ACID, THE SULFURIC ACID CONCENTRATION BEING BETWEEN ABOUT 62.5% AND ABOUT 80% DROWNING THE PIGMENT-ACID SLURRY IN WATER, SEPARATING THE PIGMENT, AND NEUTRALIZING ACID REMAINING IN THE PIGMENT.
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) | 1959-11-13 | 1960-05-14 | 1960-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-11-13 | 1964-05-14 | 1964-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-11-13 | 1968-05-14 | 1968-11-13 | $7700.00 | Window Closed / Lapsed |