Patent US2604476A successfully refreshed from Google Patents.
US2604476A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Substituted phthalocyanines and process for preparing the same
Assignee: Imperial Chemical Industries Ltd
•
Filing: 1950-05-22
•
Granted: 1952-07-22
•
Expires: 1970-05-22
Abstract
No abstract record available.
Inventors
- 👤 Jones William Owen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:46
CPC Classifications
C; C09; C09B; C09B47/00; C09B47/04; C09B47/08; C09B47/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
9 words
COLORING MATTERS OF THE PHTHALOCYANINE SERIES HAVING THE FORMULA-
Claim 2
Dependent Claim
9 words
COLORING MATTERS OF THE PHTHALOCYANINE SERIES HAVING THE FORMULA-
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-07-22 | 1956-01-21 | 1956-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-07-22 | 1960-01-21 | 1960-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-07-22 | 1964-01-21 | 1964-07-22 | $7700.00 | Window Closed / Lapsed |