Patent US5081791A successfully refreshed from Google Patents.
Patent US2805947A successfully refreshed from Google Patents.
US2805947A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic developer
Assignee: Records Service Corp
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Filing: 1954-05-10
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Granted: 1957-09-10
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Expires: 1974-05-10
Abstract
No abstract record available.
Inventors
- 👤 Robert O Mease
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 04:36
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/26; Y; Y10; Y10S; Y10S430/00; Y10S430/129
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
49 words
IN A DEVELOPER FOR SILVER-HALIDE-EMULSION-BEARING SURFACES, THE COMBINATION OF THE FOLLOWING INGREDIENTS IN APPROXIMATELY THE FOLLOWING OPTIMUM PROPORTIONS FOR MIXING WITH WATER TO MAKE A TOTAL VOLUME OF 1000 CC. OF DEVELOPER READY FOR USE: WATER FOR SOLUTION-800 CC.; SODIUM SULPHITE-71 GRAMS; SODIUM HYDROXIDE-35 GRAMS; METOL-11 GRAMS; HYDROQUINONE-22 GRAMS.
Claim 2
Dependent Claim
49 words
IN A DEVELOPER FOR SILVER-HALIDE-EMULSION-BEARING SURFACES, THE COMBINATION OF THE FOLLOWING INGREDIENTS IN APPROXIMATELY THE FOLLOWING OPTIMUM PROPORTIONS FOR MIXING WITH WATER TO MAKE A TOTAL VOLUME OF 1000 CC. OF DEVELOPER READY FOR USE: WATER FOR SOLUTION-800 CC.; SODIUM SULPHITE-71 GRAMS; SODIUM HYDROXIDE-35 GRAMS; METOL-11 GRAMS; HYDROQUINONE-22 GRAMS.
References Cited (Backward Citations)
GB201538A
Cited
US2184053A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-09-09 | 1961-03-11 | 1961-09-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-09-09 | 1965-03-11 | 1965-09-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-09-09 | 1969-03-11 | 1969-09-10 | $7700.00 | Window Closed / Lapsed |