Patent US2741534A successfully refreshed from Google Patents.
US2741534A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for dissolving metal-free phthalocyanine pigments and use of solution for dyeing
Assignee: EIDP Inc
•
Filing: 1952-05-15
•
Granted: 1956-04-10
•
Expires: 1972-05-15
Abstract
No abstract record available.
Inventors
- 👤 Pedersen Charles John
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 04:55
CPC Classifications
C; C09; C09B; C09B47/00; C09B47/04; C09B47/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
61 words
A PROCESS OF CHANGING THE PHYSICAL STATE OF A NONSOLUBILIZED METAL-FREE PHTHALOCYANINE PIGMENT, WHICH COMPRIES REACTING UPON THE SAME WITH A QUATERNARY AMMONIUM HYDROXIDE IN A SOLVENT SELECTED FROM THE GROUP CONSISTING OF PYRIDINE, QUINOLINE, 2-PICOLINE, 2,6-LUTIDINE, PYRROLE AND DIMETHYLFORMAMIDE, WHEREBY TO EFFECT DISSOLUTION OF THE COLOR IN SAID SOLVENT, SAID QUARTERNARY AMMONIUM HYDROXIDE BEING A COMPOUND OF THE GENERAL FORMULA
Claim 2
Dependent Claim
61 words
A PROCESS OF CHANGING THE PHYSICAL STATE OF A NONSOLUBILIZED METAL-FREE PHTHALOCYANINE PIGMENT, WHICH COMPRIES REACTING UPON THE SAME WITH A QUATERNARY AMMONIUM HYDROXIDE IN A SOLVENT SELECTED FROM THE GROUP CONSISTING OF PYRIDINE, QUINOLINE, 2-PICOLINE, 2,6-LUTIDINE, PYRROLE AND DIMETHYLFORMAMIDE, WHEREBY TO EFFECT DISSOLUTION OF THE COLOR IN SAID SOLVENT, SAID QUARTERNARY AMMONIUM HYDROXIDE BEING A COMPOUND OF THE GENERAL FORMULA
References Cited (Backward Citations)
US385426A
Cited
US2587597A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-04-10 | 1959-10-10 | 1960-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-04-10 | 1963-10-10 | 1964-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-04-10 | 1967-10-10 | 1968-04-10 | $7700.00 | Window Closed / Lapsed |