US2649376A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Single powder developers containing stabilized alkali hydroxides
Assignee: Eastman Kodak Co
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Filing: 1952-06-26
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Granted: 1953-08-18
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Expires: 1972-06-26
Abstract
No abstract record available.
Inventors
- 👤 Arthur A Rasch
- 👤 Richard W Henn
- 👤 John I Crabtree
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:22
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/26; G03C5/264; G03C5/265
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
105 words
A STABLE SINGLE POWDER PHOTOGRAPHIC DEVELOPER COMPOSITION CONTAINING AN ORGANIC SILVER HALIDE DEVELOPER, A STABILIZING AGENT SELECTED FROM THE GROUP CONSISTING OF BORIC ANHYDRIDE, TETRABORIC ACID, METABORC ACID, PARTIALLY HYDRATED FORMS OF BORIC ANHYDRIDE, INTERMEDIATE BETWEEN BORIC ANHYDRIDE AND METABORIC ACID, ALKALI BISULFITE, AND ALKALI METALBISULFITE, A PRESERVATIVE SELECTED FROM THE GROUP CONSISTING OF ALKALI SULFITE AND ALKALI BISULFITE, A BUFFER COMPOUND SELECTED FROM THE GROUP CONSISTING OF THE ALKALI SALTS OF BORIC ACID, CARBONIC ACID, AND PHOSPHORIC ACID, AND AN ALAKLI SELECTED FROM THE GROUP CONSISTING OF SODIUM AND POTASSIUM HYDROXIDES, WHICH HAVE BEEN COATED WITH 2 TO 20% BY WEIGHT OF PHTHALIC ANHYDRIDE.
Claim 2
Dependent Claim
105 words
A STABLE SINGLE POWDER PHOTOGRAPHIC DEVELOPER COMPOSITION CONTAINING AN ORGANIC SILVER HALIDE DEVELOPER, A STABILIZING AGENT SELECTED FROM THE GROUP CONSISTING OF BORIC ANHYDRIDE, TETRABORIC ACID, METABORC ACID, PARTIALLY HYDRATED FORMS OF BORIC ANHYDRIDE, INTERMEDIATE BETWEEN BORIC ANHYDRIDE AND METABORIC ACID, ALKALI BISULFITE, AND ALKALI METALBISULFITE, A PRESERVATIVE SELECTED FROM THE GROUP CONSISTING OF ALKALI SULFITE AND ALKALI BISULFITE, A BUFFER COMPOUND SELECTED FROM THE GROUP CONSISTING OF THE ALKALI SALTS OF BORIC ACID, CARBONIC ACID, AND PHOSPHORIC ACID, AND AN ALAKLI SELECTED FROM THE GROUP CONSISTING OF SODIUM AND POTASSIUM HYDROXIDES, WHICH HAVE BEEN COATED WITH 2 TO 20% BY WEIGHT OF PHTHALIC ANHYDRIDE.
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) | 1956-08-17 | 1957-02-16 | 1957-08-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-08-17 | 1961-02-16 | 1961-08-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-08-17 | 1965-02-16 | 1965-08-18 | $7700.00 | Window Closed / Lapsed |