US2777863A
Expired / Lapsed
US
⏱️ 0.0 years remaining
1, 5-dihydroxy-8-nitro-4-aminoanthraquinone compounds
Assignee: Eastman Kodak Co
•
Filing: 1951-08-17
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Granted: 1957-01-15
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Expires: 1971-08-17
Abstract
No abstract record available.
Inventors
- 👤 Joseph B Dickey
- 👤 Edmund B Towne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 00:13
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)
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US2480269A
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US2651641A
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US2713060A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-01-15 | 1960-07-16 | 1961-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-01-15 | 1964-07-16 | 1965-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-01-15 | 1968-07-16 | 1969-01-15 | $7700.00 | Window Closed / Lapsed |