US2889323A
Expired / Lapsed
US
⏱️ 0.0 years remaining
New dyestuffs of the anthraquinone series
Assignee: Imperial Chemical Industries Ltd
•
Filing: 1957-01-17
•
Granted: 1959-06-02
•
Expires: 1977-01-17
Abstract
No abstract record available.
Inventors
- 👤 Heslop Robert Norman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 13:45
CPC Classifications
C; C09; C09B; C09B62/00; C09B62/02; C09B62/04; C09B62/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
5 words
ANTHRAQUINONE DYESTUFFS OF THE FORMULA:
Claim 2
Dependent Claim
5 words
ANTHRAQUINONE DYESTUFFS OF THE FORMULA:
References Cited (Backward Citations)
GB467815A
Cited
US2773871A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-06-01 | 1962-12-01 | 1963-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-06-01 | 1966-12-01 | 1967-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-06-01 | 1970-12-01 | 1971-06-02 | $7700.00 | Window Closed / Lapsed |