Patent US2556730A successfully refreshed from Google Patents.
US2556730A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of producing tinctorially stable phthalocyanine coloring matters
Assignee: EIDP Inc
•
Filing: 1949-10-19
•
Granted: 1951-06-12
•
Expires: 1969-10-19
Abstract
No abstract record available.
Inventors
- 👤 Graham Donald Penrose
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:06
CPC Classifications
C; C09; C09B; C09B67/00; C09B67/0032; C09B67/0025; C09B67/0026
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
45 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 A CRUDE CHLORINE-FREE PHTHALOCYANINE IN BETA FORM TO SALT-MILLING IN THE PRESENCE OF A LIQUID AROMATIC HYDROCARBON WHICH IS CHARACTERIZED BY
Claim 2
Dependent Claim
45 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 A CRUDE CHLORINE-FREE PHTHALOCYANINE IN BETA FORM TO SALT-MILLING IN THE PRESENCE OF A LIQUID AROMATIC HYDROCARBON WHICH IS CHARACTERIZED BY
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 |