Patent US3264263A successfully refreshed from Google Patents.
Patent US2964531A successfully refreshed from Google Patents.
US2964531A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Acid pasting phthalocyanines
Assignee: Pittsburgh Chemical Co
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Filing: 1956-11-06
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Granted: 1960-12-13
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Expires: 1976-11-06
Abstract
No abstract record available.
Inventors
- 👤 Ben H Kirby
- 👤 Donald P Bernard
- 👤 Joseph S Milazzo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 05:48
CPC Classifications
C; C09; C09B; C09B67/00; C09B67/0001; C09B67/0017; C09B67/0019
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
65 words
IN A PROCESS OF ACID MILLING A PHTHALOCYANINE PIGMENT WITH FORCES PREDOMINANTLY SHEARING IN NATURE, THE IMPROVEMENT COMPRISING CARRYING OUT THE ACID MILLING IN THE PRESENCE OF 2 TO 30% OF AN ORGANIC COMPOUND SELECTED FROM THE GROUP CONSISTING OF HYDROCARBON DICARBOXYLIC ACIDS AND THE ANHYDRIDES THEREOF BASED ON THE WEIGHT OF SAID PIGMENT AND AT A TEMPERATURE OF TREATMENT BETWEEN ABOUT 45 AND 100*C.
Claim 2
Dependent Claim
65 words
IN A PROCESS OF ACID MILLING A PHTHALOCYANINE PIGMENT WITH FORCES PREDOMINANTLY SHEARING IN NATURE, THE IMPROVEMENT COMPRISING CARRYING OUT THE ACID MILLING IN THE PRESENCE OF 2 TO 30% OF AN ORGANIC COMPOUND SELECTED FROM THE GROUP CONSISTING OF HYDROCARBON DICARBOXYLIC ACIDS AND THE ANHYDRIDES THEREOF BASED ON THE WEIGHT OF SAID PIGMENT AND AT A TEMPERATURE OF TREATMENT BETWEEN ABOUT 45 AND 100*C.
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) | 1963-12-13 | 1964-06-13 | 1964-12-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-12-13 | 1968-06-13 | 1968-12-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-12-13 | 1972-06-13 | 1972-12-13 | $7700.00 | Window Closed / Lapsed |