US2846308A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alkali hydroxides for use in single-powder photographic developers
Assignee: Eastman Kodak Co
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Filing: 1954-11-26
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Granted: 1958-08-05
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Expires: 1974-11-26
Abstract
No abstract record available.
Inventors
- 👤 Ralph W Baxendale
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 09:37
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/26; G03C5/264; G03C5/265
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
88 words
A STABLE SINGLE POWDER PHOTOGRAPHIC DEVELOPER COMPOSITION WHICH RESISTS DETERIORATION WHEN HEATED TO 120* F. CONTAINING AN ORGANIC SILVER HALIDE DEVELOPER, A BASIC INGREDIENT SELECTED FROM THE GROUP CONSISTING OF ALKALI BORATES AND SULFITES AND AN ALKALI HYDROXIDE IN THE FORM OF FINELY DIVIDED PARTICLES SELECTED FROM THE GROUP CONSISTING OF SODIUM, POTASSIUM, AND LITHIUM HYDROXIDE HAVING A FIRST PROTECTIVE COATING THEREOVER OF SODIUM PHTHALATE AND A SECOND PROTECTIVE COATING ON SAID FIRST PROTECTIVE COATING SELECTED FROM THE GROUP CONSISTING OF SODIUM CHLORO PHTHALATE,BORON ACETATE, AND 2,2,1-BICYCLO-5HEPTANE-2,3-DICARBOXYLIC ANHYDRIDE.
Claim 2
Dependent Claim
88 words
A STABLE SINGLE POWDER PHOTOGRAPHIC DEVELOPER COMPOSITION WHICH RESISTS DETERIORATION WHEN HEATED TO 120* F. CONTAINING AN ORGANIC SILVER HALIDE DEVELOPER, A BASIC INGREDIENT SELECTED FROM THE GROUP CONSISTING OF ALKALI BORATES AND SULFITES AND AN ALKALI HYDROXIDE IN THE FORM OF FINELY DIVIDED PARTICLES SELECTED FROM THE GROUP CONSISTING OF SODIUM, POTASSIUM, AND LITHIUM HYDROXIDE HAVING A FIRST PROTECTIVE COATING THEREOVER OF SODIUM PHTHALATE AND A SECOND PROTECTIVE COATING ON SAID FIRST PROTECTIVE COATING SELECTED FROM THE GROUP CONSISTING OF SODIUM CHLORO PHTHALATE,BORON ACETATE, AND 2,2,1-BICYCLO-5HEPTANE-2,3-DICARBOXYLIC ANHYDRIDE.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-08-04 | 1962-02-03 | 1962-08-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-08-04 | 1966-02-03 | 1966-08-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-08-04 | 1970-02-03 | 1970-08-05 | $7700.00 | Window Closed / Lapsed |