Patent US2805218A successfully refreshed from Google Patents.
US2805218A
Expired / Lapsed
US
⏱️ 0.0 years remaining
2-amino-3-nitro-5-acylthiophene azo dye compounds
Assignee: Eastman Kodak Co
•
Filing: 1954-04-05
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Granted: 1957-09-03
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Expires: 1974-04-05
Abstract
No abstract record available.
Inventors
- 👤 Edmund B Towne
- 👤 Melvin S Bloom
- 👤 Joseph B Dickey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 01:50
CPC Classifications
C; C09; C09B; C09B29/00; C09B29/0025
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
6 words
THE AZO COMPOUNDS HAVING THE FORMULA:
Claim 2
Dependent Claim
6 words
THE AZO COMPOUNDS HAVING THE FORMULA:
References Cited (Backward Citations)
US2625542A
Cited
US2680117A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-09-02 | 1961-03-04 | 1961-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-09-02 | 1965-03-04 | 1965-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-09-02 | 1969-03-04 | 1969-09-03 | $7700.00 | Window Closed / Lapsed |