US3239536A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Quaternary hydrazino-substituted copper phthalocyanine dyestuffs
Assignee: Imperial Chemical Industries Ltd
•
Filing: 1963-05-06
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Granted: 1966-03-08
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Expires: 1983-05-06
Abstract
No abstract record available.
Inventors
- 👤 Barben Ian Knowles
- 👤 Poole Victor David
- 👤 Stead Cecil Vivian
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:33
CPC Classifications
C; C09; C09B; C09B67/00; C09B67/006; C09B47/00; C09B47/04; C09B47/32
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
9 words
THE PHTHALOCYANINE DYESTUFFS WHICH ARE REPRESENTED BY THE FORMULA:
Claim 2
Dependent Claim
9 words
THE PHTHALOCYANINE DYESTUFFS WHICH ARE REPRESENTED BY THE FORMULA:
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) | 1969-03-07 | 1969-09-06 | 1970-03-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-03-07 | 1973-09-06 | 1974-03-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-03-07 | 1977-09-06 | 1978-03-08 | $7700.00 | Window Closed / Lapsed |