US2957010A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Quaternary ammonium salts of anthraquinone dye compounds
Assignee: Eastman Kodak Co
•
Filing: 1958-08-28
•
Granted: 1960-10-18
•
Expires: 1978-08-28
Abstract
No abstract record available.
Inventors
- 👤 James M Straley
- 👤 Ralph R Giles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 16:59
CPC Classifications
C; C09; C09B; C09B1/00; C09B1/16; C09B1/20; C09B1/207
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)
DE855541C
Cited
US2716655A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-10-18 | 1964-04-18 | 1964-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-10-18 | 1968-04-18 | 1968-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-10-18 | 1972-04-18 | 1972-10-18 | $7700.00 | Window Closed / Lapsed |