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Patent US3053850A successfully refreshed from Google Patents.
US3053850A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reactive phthalocyanine dyestuffs
Assignee: Imperial Chemical Industries Ltd
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Filing: 1960-11-07
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Granted: 1962-09-11
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Expires: 1980-11-07
Abstract
No abstract record available.
Inventors
- 👤 Clark Peter Frederick
- 👤 Gamlen George Albert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 09:44
CPC Classifications
C; C09; C09B; C09B62/00; C09B62/44; C09B62/523; C09B62/537
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
5 words
A COMPOUND OF THE FORMULA
Claim 2
Dependent Claim
5 words
A COMPOUND OF THE FORMULA
Claim 3
Dependent Claim
17 words
A PHTHALOCYANINE DYESTUFF AS CLAIMED IN CLAIM 1 WHEREIN R1 AND R2 EACH REPRESENTS A HYDROGEN ATOM.
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) | 1965-09-10 | 1966-03-12 | 1966-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-09-10 | 1970-03-12 | 1970-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-09-10 | 1974-03-12 | 1974-09-11 | $7700.00 | Window Closed / Lapsed |