US2964532A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of pigments
Assignee: EIDP Inc
•
Filing: 1957-04-17
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Granted: 1960-12-13
•
Expires: 1977-04-17
Abstract
No abstract record available.
Inventors
- 👤 Jr Edward F Klenke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 17:39
CPC Classifications
C; C09; C09B; C09B47/00; C09B47/04; C09B47/06; C09B47/067; B; B01; B01J; B01J10/00; B01J10/02; B01J19/00; B01J19/18; B01J19/1887; B01J19/20; B01J2219/00; B01J2219/00049; B01J2219/00051; B01J2219/00132; B01J2219/00135
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
85 words
IN A PROCESS FOR THE MANUFACTURE OF A PHTHALOCYANINE BY FUSION SYNTHESIS OF PHTHALOCYANINE-FORMING REACTANTS, THE IMPROVEMENT WHICH COMPRISES PASSING A THIN LAYER OF THE PREMIXED REACTANTS ABOUT 1/4 INCH TO 1/2 INCH THICK AT A TEMPERATURE OF FROM ABOUT 200*C.250*C. BETWEEN AND IN CONTACT WITH A GLASS ENAMEL INNER SURFACE OF A CYLINDER AND THE GLASS ENAMEL SURFACE OF A SCREW ROTATING WITHIN SAID CYLINDER, AND RECOVERING PHTHALOCYANINE FROM SAID CYLINDER AT THE OPPOSITE END FROM WHICH THE THIN LAYER OF REACTANTS IS INTRODUCED.
References Cited (Backward Citations)
US1904548A
Cited
US2214477A
Cited
US2153300A
Cited
US2194250A
Cited
US2364456A
Cited
US2402167A
Cited
US2587639A
Cited
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 |