US2741531A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for changing the physical state of metal-free phthalocyanine pigments and use of solution of same for dyeing
Assignee: EIDP Inc
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Filing: 1952-05-15
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Granted: 1956-04-10
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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
2026-10-26 02:07
CPC Classifications
C; C09; C09B; C09B47/00; C09B47/04; C09B47/30; D; D06; D06P; D06P1/00; D06P1/44
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
94 words
A PROCESS OF DYEING CELLULOSIC FIBER, WHICH COMPRISES TREATING METAL-FREE PHTHALOCYANINE WITH AN ALKALINE COMPOUND FROM THE GROUP CONSISTING OF THE HYDROXIDES, ALKOXIDES AND HYDRIDES OF THE ALKALI-METALS IN A LIQUID ALCOHOLIC SOLVENT SELECTED FROM THE GROUP CONSISTING OF THE CYCLOHEXANOLS, PRIMARY AND SECONDARY OPEN CHAIN ALCOHOLS HACING FROM 2 TO 12 C-ATOMS PER MOLECULE, AND THE LOWER ALKOXY ETHANOLS, WHEREBY TO EFFECT DISSOLUTION OF THE COLOR IN SAID ALCOHOLIC SOLVENT, IMPREGNATING THE FIBER WITH THE RESULTING SOLUTION, AND TREATING THE IMPREGNATED FIBER WITH WATER, WHEREBY TO REGENERATE A METALFREE PHTHALOCYANINE WITHIN THE FIBER.
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) | 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 |