US2625475A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stabilization of photographic developers
Assignee: Eastman Kodak Co
•
Filing: 1951-03-28
•
Granted: 1953-01-13
•
Expires: 1971-03-28
Abstract
No abstract record available.
Inventors
- 👤 Harold D Russell
- 👤 Grant M Haist
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:11
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/26; G03C5/29; G03C5/305
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
28 words
AN ALKALINE PHOTOGRAPHIC DEVELOPING SOLUTION COMPRISING A SILVER HALIDE DEVELOPER, A HYDRAZINE, AND A COMPOUND SELECTED FROM THE GROUP CONSISTING OF DIGLYCOLIC ACID AND ITS ALKALI METAL SALTS.
Claim 2
Dependent Claim
28 words
AN ALKALINE PHOTOGRAPHIC DEVELOPING SOLUTION COMPRISING A SILVER HALIDE DEVELOPER, A HYDRAZINE, AND A COMPOUND SELECTED FROM THE GROUP CONSISTING OF DIGLYCOLIC ACID AND ITS ALKALI METAL SALTS.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-01-13 | 1956-07-14 | 1957-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-01-13 | 1960-07-14 | 1961-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-01-13 | 1964-07-14 | 1965-01-13 | $7700.00 | Window Closed / Lapsed |