US2537975A
Expired / Lapsed
US
⏱️ 0.0 years remaining
1-fluoralkylamino-4-arylamino-anthraquinone compounds
Assignee: Eastman Kodak Co
•
Filing: 1948-01-31
•
Granted: 1951-01-16
•
Expires: 1968-01-31
Abstract
No abstract record available.
Inventors
- 👤 Joseph B Dickey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:31
CPC Classifications
C; C09; C09B; C09B1/00; C09B1/16; C09B1/20; C09B1/26; C09B1/32; C09B1/325
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
6 words
THE ANTHRAQUINONE COMPOUNDS HAVING THE FORMULA:
Claim 2
Dependent Claim
6 words
THE ANTHRAQUINONE COMPOUNDS HAVING THE FORMULA:
References Cited (Backward Citations)
US2326047A
Cited
US2333402A
Cited
US2085736A
Cited
US2174182A
Cited
US2357176A
Cited
US2391011A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-01-15 | 1954-07-17 | 1955-01-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-01-15 | 1958-07-17 | 1959-01-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-01-15 | 1962-07-17 | 1963-01-16 | $7700.00 | Window Closed / Lapsed |