US2556728A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of producing tinctorially stable phthalocyanine coloring matters
Assignee: EIDP Inc
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Filing: 1949-03-05
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Granted: 1951-06-12
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Expires: 1969-03-05
Abstract
No abstract record available.
Inventors
- 👤 Graham Donald Penrose
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 02:40
CPC Classifications
C; C09; C09B; C09B67/00; C09B67/0025; C09B67/0026; C09B67/0032
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
91 words
A PROCESS FOR PRODUCING A CHLORINE-FREE PHTHALOCYANINE PIGMENT IN A FINELY DIVIDED PHYSICAL FORM CHARACTERIZED BY TINCTORIAL STABILITY IN AROMATIC SOLVENTS, WHICH COMPRISES SUBJECTING THE PIGMENT TO SALT-MILLING IN THE PRESENCE OF A LIQUID A CHORINATED HYDROCARBON WHICH IS CHARACTERIZED BY ITS ABILITY TO TRANSFORM THE ALPHAFORM OF PHTHALOCYANINE PIGMENTS INTO THE BETAFORM, THE QUANTITY OF SAID ORGANIC LIQUID BEING INSUFFICIENT TO CONVERT THE SALT-PIGMENT MIXTURE INTO A DOUGHY MASS AND BEING IN ANY EVENT NOT GREATER THAN 0.5 PART BY WEIGHT FOR EACH PART BY WEIGHT OF SAID PHTHALOCYANINE PIGMENT.
Claim 2
Dependent Claim
91 words
A PROCESS FOR PRODUCING A CHLORINE-FREE PHTHALOCYANINE PIGMENT IN A FINELY DIVIDED PHYSICAL FORM CHARACTERIZED BY TINCTORIAL STABILITY IN AROMATIC SOLVENTS, WHICH COMPRISES SUBJECTING THE PIGMENT TO SALT-MILLING IN THE PRESENCE OF A LIQUID A CHORINATED HYDROCARBON WHICH IS CHARACTERIZED BY ITS ABILITY TO TRANSFORM THE ALPHAFORM OF PHTHALOCYANINE PIGMENTS INTO THE BETAFORM, THE QUANTITY OF SAID ORGANIC LIQUID BEING INSUFFICIENT TO CONVERT THE SALT-PIGMENT MIXTURE INTO A DOUGHY MASS AND BEING IN ANY EVENT NOT GREATER THAN 0.5 PART BY WEIGHT FOR EACH PART BY WEIGHT OF SAID PHTHALOCYANINE PIGMENT.
References Cited (Backward Citations)
GB569402A
Cited
US2486304A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-06-11 | 1954-12-11 | 1955-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-06-11 | 1958-12-11 | 1959-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-06-11 | 1962-12-11 | 1963-06-12 | $7700.00 | Window Closed / Lapsed |