Patent US2441491A successfully refreshed from Google Patents.
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 21:56
CPC Classifications
G; G03; G03C; G03C7/00; G03C7/30; G03C7/32
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2108602A
Cited
US2181944A
Cited
US2133937A
Cited
US2303380A
Cited
US2220908A
Cited
US2269481A
Cited
US2380809A
Cited
US2350380A
Cited
US2328652A
Cited
US2367531A
Cited
US2369929A
Cited
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 |