US2641602A
Expired / Lapsed
US
⏱️ 0.0 years remaining
1, 8-dihydroxy-5-nitro-4-hydroxyethylphenyl aminoanthraquinone compounds
Assignee: Eastman Kodak Co
•
Filing: 1950-11-29
•
Granted: 1953-06-09
•
Expires: 1970-11-29
Abstract
No abstract record available.
Inventors
- 👤 James M Straley
- 👤 Joseph B Dickey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 01:19
CPC Classifications
C; C09; C09B; C09B62/00; C09B62/44; C09B62/78; C09B62/80; C09B1/00; C09B1/50; C09B1/51; C09B1/514; C09B1/515
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
7 words
THE ANTHRAQUINONE COMPOUNDS HAVING THE GENERAL FORMULA:
Claim 2
Dependent Claim
7 words
THE ANTHRAQUINONE COMPOUNDS HAVING THE GENERAL 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) | 1956-06-08 | 1956-12-08 | 1957-06-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-06-08 | 1960-12-08 | 1961-06-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-06-08 | 1964-12-08 | 1965-06-09 | $7700.00 | Window Closed / Lapsed |