US3349074A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Water-soluble azo dyestuffs
Assignee: Imperial Chemical Industries Ltd
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Filing: 1963-12-16
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Granted: 1967-10-24
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Expires: 1983-12-16
Abstract
No abstract record available.
Inventors
- 👤 Andrew Herbert Francis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 10:59
CPC Classifications
C; C09; C09B; C09B62/00; C09B62/02; C09B62/04; C09B62/08; C09B62/095; C09B62/022; C09B62/026; C09B62/032
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
19 words
THE METAL COMPLEXES SELECTED FROMTHE CLASS CONSISTING OF 1:1-COPPER, 1:2-CHROMIUM AND 1:2-COBALT COMPLEXES OF BISAZO DYESTUFFS OF THE FORMULA:
Claim 2
Dependent Claim
19 words
THE METAL COMPLEXES SELECTED FROMTHE CLASS CONSISTING OF 1:1-COPPER, 1:2-CHROMIUM AND 1:2-COBALT COMPLEXES OF BISAZO DYESTUFFS OF 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) | 1970-10-23 | 1971-04-24 | 1971-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-10-23 | 1975-04-24 | 1975-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-10-23 | 1979-04-24 | 1979-10-24 | $7700.00 | Window Closed / Lapsed |