US2541470A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic silver halide developing solutions containing calcium precipitation inhibitors
Assignee: Eastman Kodak Co
•
Filing: 1947-05-28
•
Granted: 1951-02-13
•
Expires: 1967-05-28
Abstract
No abstract record available.
Inventors
- 👤 Richard W Henn
- 👤 John I Crabtree
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 11:40
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/26; G03C5/29; G03C5/305; G03C5/3053
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
27 words
AN ALKALINE PHOTOGRAPHIC DEVELOPING SOLUTION COMPRISING A SILVER HALIDE DEVELOPING AGENT, FROM 0.2 TO 20 GRAMS PER LITER OF SOLUTION OF AN ALKALI-METAL PHOSPHATE HAVING THE FORMULA
Claim 2
Dependent Claim
27 words
AN ALKALINE PHOTOGRAPHIC DEVELOPING SOLUTION COMPRISING A SILVER HALIDE DEVELOPING AGENT, FROM 0.2 TO 20 GRAMS PER LITER OF SOLUTION OF AN ALKALI-METAL PHOSPHATE HAVING THE FORMULA
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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) | 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 |