US3102894A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Anthraquinone dyestuffs
Assignee: Imperial Chemical Industries Ltd
•
Filing: 1961-10-03
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Granted: 1963-09-03
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Expires: 1981-10-03
Abstract
No abstract record available.
Inventors
- 👤 Lodge Frank
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:12
CPC Classifications
C; C09; C09B; C09B1/00; C09B1/16; C09B1/20; C09B1/26; C09B1/32; C09B1/34
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
13 words
THE ANTHRAQUINONE DYESTUFF WHICH, IN THE ACID FORM, ARE REPRESENTED BY THE FORMULA:
Claim 2
Dependent Claim
13 words
THE ANTHRAQUINONE DYESTUFF WHICH, IN THE ACID FORM, 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) | 1966-09-02 | 1967-03-04 | 1967-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-09-02 | 1971-03-04 | 1971-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-09-02 | 1975-03-04 | 1975-09-03 | $7700.00 | Window Closed / Lapsed |