US2723980A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of phthalocyanine pigments
Assignee: Wyeth Holdings LLC
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Filing: 1951-10-17
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Granted: 1955-11-15
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Expires: 1971-10-17
Abstract
No abstract record available.
Inventors
- 👤 Frank R Tarantino
- 👤 Tullsen Volney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:07
CPC Classifications
C; C09; C09B; C09B67/00; C09B67/0001; C09B67/0002; C09B47/00; C09B47/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
81 words
IN THE PROCESS OF PRODUCING A NONCRYSTALLIZING, ESSENTIALLY NONFLOCCULATING CHLORINE-FREE METALLIZED PHTHALOCYANINE PIGMENT, THE STEPS WHICH COMPRISE HEATING AT REACTION TEMPERATURE PHTHALIC ANHYDRIDE, UREA AND A METALLIC SALT IN THE PRESENCE OF A CRYSTALLIZING ORGANIC LIQUID SO AS TO FORM THE METALLIZED PHTHALOCYANINE, ADDING A SOLID GRINDING AID TO THE REACTION MIXTURE, SUBJECTING THE PHTHALOCYANINE TO GRINDING IN THE PRESENCE OF THE ORGANIC LIQUID UNTIL THE PHTHALOCYANINE IS TRANSFORMED INTO FINELYDIVIDED, CRYSTALLIZING ORGANIC LIQUID STABLE FORM, AND THEREAFTER RECOVERING THE PIGMENT.
Claim 2
Dependent Claim
81 words
IN THE PROCESS OF PRODUCING A NONCRYSTALLIZING, ESSENTIALLY NONFLOCCULATING CHLORINE-FREE METALLIZED PHTHALOCYANINE PIGMENT, THE STEPS WHICH COMPRISE HEATING AT REACTION TEMPERATURE PHTHALIC ANHYDRIDE, UREA AND A METALLIC SALT IN THE PRESENCE OF A CRYSTALLIZING ORGANIC LIQUID SO AS TO FORM THE METALLIZED PHTHALOCYANINE, ADDING A SOLID GRINDING AID TO THE REACTION MIXTURE, SUBJECTING THE PHTHALOCYANINE TO GRINDING IN THE PRESENCE OF THE ORGANIC LIQUID UNTIL THE PHTHALOCYANINE IS TRANSFORMED INTO FINELYDIVIDED, CRYSTALLIZING ORGANIC LIQUID STABLE FORM, AND THEREAFTER RECOVERING THE PIGMENT.
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) | 1958-11-14 | 1959-05-16 | 1959-11-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-11-14 | 1963-05-16 | 1963-11-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-11-14 | 1967-05-16 | 1967-11-15 | $7700.00 | Window Closed / Lapsed |