US2739894A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Single powder photographic developers containing lithium hydroxide
Assignee: Eastman Kodak Co
•
Filing: 1954-04-01
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Granted: 1956-03-27
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Expires: 1974-04-01
Abstract
No abstract record available.
Inventors
- 👤 Arthur A Rasch
- 👤 John I Crabtree
- 👤 Richard W Henn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:16
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/26; G03C5/264; G03C5/265
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
46 words
A STABLE SINGLE POWDER PHOTOGRAPHIC DEVELOPER COMPOSITION CONTAINING A MIXTURE OF AN ORGANIC SILVER HALIDE DEVELOPER, LITHIUM HYDROXIDE MONOHYDRATE AND A STABILIZING AGENT SELECTED FROM THE GROUP CONSISTING OF BORIC ANHYDRIDE, METABORIC ACID, PHTHALIC ANHYDRIDE, CHLORPHALIC ANHYDRIDE, SODIUM BISULFITE, POTASSIUM BISULFITE, SODIUM METABISULFITE AND POTASSIUM METABISULFITE.
Claim 2
Dependent Claim
46 words
A STABLE SINGLE POWDER PHOTOGRAPHIC DEVELOPER COMPOSITION CONTAINING A MIXTURE OF AN ORGANIC SILVER HALIDE DEVELOPER, LITHIUM HYDROXIDE MONOHYDRATE AND A STABILIZING AGENT SELECTED FROM THE GROUP CONSISTING OF BORIC ANHYDRIDE, METABORIC ACID, PHTHALIC ANHYDRIDE, CHLORPHALIC ANHYDRIDE, SODIUM BISULFITE, POTASSIUM BISULFITE, SODIUM METABISULFITE AND POTASSIUM METABISULFITE.
References Cited (Backward Citations)
US2366496A
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US2384592A
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US2606118A
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US2649376A
Cited
US2666702A
Cited
US2666703A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-03-27 | 1959-09-26 | 1960-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-03-27 | 1963-09-26 | 1964-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-03-27 | 1967-09-26 | 1968-03-27 | $7700.00 | Window Closed / Lapsed |