US2548574A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sulfonamide substituted p-phenylenediamines containing o-alkoxy groups as silver halide photographic developers
Assignee: Eastman Kodak Co
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Filing: 1947-02-27
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Granted: 1951-04-10
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Expires: 1967-02-27
Abstract
No abstract record available.
Inventors
- 👤 Weissberger Arnold
- 👤 Dudley B Glass
- 👤 Paul W Vittum
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 13:35
CPC Classifications
A; A61; A61K; A61K8/00; A61K8/18; A61K8/30; A61K8/46; A61K8/466; A61Q; A61Q5/00; A61Q5/10; G; G03; G03C; G03C7/00; G03C7/30; G03C7/407; G03C7/413; G03C7/4136
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
32 words
THE METHOD OF DEVELOPING A SILVER HALIDE EMULSION WHICH COMPRISES TREATING AN EXPOSED SILVER HALIDE EMULSION LAYER CONTAINING A LATENT IMAGE, WITH A SOLUTION CONTAINING A COMPOUND OF THE FOLLOWING GENERAL FORMULA:
References Cited (Backward Citations)
FR804473A
Cited
US2193015A
Cited
GB536577A
Cited
GB541328A
Cited
US2304953A
Cited
US2364350A
Cited
US2374337A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-04-09 | 1954-10-09 | 1955-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-04-09 | 1958-10-09 | 1959-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-04-09 | 1962-10-09 | 1963-04-10 | $7700.00 | Window Closed / Lapsed |