US2541490A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tone control in photographic development
Assignee: Eastman Kodak Co
•
Filing: 1945-07-11
•
Granted: 1951-02-13
•
Expires: 1965-07-11
Abstract
No abstract record available.
Inventors
- 👤 John A C Yule
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 08:40
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/26; G03C7/00; G03C7/18
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
GB547734A
Cited
US1973466A
Cited
US1954335A
Cited
GB488650A
Cited
GB466299A
Cited
US2186054A
Cited
US2253070A
Cited
US2338661A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-02-12 | 1954-08-14 | 1955-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-02-12 | 1958-08-14 | 1959-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-02-12 | 1962-08-14 | 1963-02-13 | $7700.00 | Window Closed / Lapsed |