US2441491A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cyanacetylamino phenol color formers for color photography
Assignee: Ilford Imaging UK Ltd
•
Filing: 1945-05-03
•
Granted: 1948-05-11
•
Expires: 1965-05-03
Abstract
No abstract record available.
Inventors
- 👤 Kendall John David
- 👤 Fry Douglas James
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:14
CPC Classifications
G; G03; G03C; G03C7/00; G03C7/30; G03C7/32
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2369929A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-05-11 | 1951-11-10 | 1952-05-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-05-11 | 1955-11-10 | 1956-05-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-05-11 | 1959-11-10 | 1960-05-11 | $7700.00 | Window Closed / Lapsed |