US2980536A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic shortstop compositions
Assignee: Morton Chemical Co
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Filing: 1956-07-02
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Granted: 1961-04-18
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Expires: 1976-07-02
Abstract
No abstract record available.
Inventors
- 👤 Kimura Shuji
- 👤 Jules N Stich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 05:16
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/26; G03C5/268; Y; Y10; Y10S; Y10S430/00; Y10S430/164
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
162 words
IN THE PROCESS OF RAPDILY PRODUCING A SILVER IMAGE IN A LIGHT EXPOSED SILVER HALIDE EMULSION LAYER COMPRISING (1) DEVELOPING THE EXPOSED EMULSION LAYER WITH A SUPERACTIVE BLACK-AND WHITE DEVELOPER, (2) SHORTSTOPPING THE DEVELOPMENT BY IMMERSING THE DEVELOPED EMULSION LAYER IN AN AQUEOUS SOLUTION OF A SUBSTANCE SELECTED FROM THE GROUP CONSISTING OF SODIUM BISULFATE, POTASSIUM BISULFATE, AMMONIUM BISULFATE, SULFURIC ACID AND HYDROCHLORIC ACID HAVING AN ACID HYDROGEN CONTENT EQUIVALENT TO THAT OF AN AQUEOUS SOLUTION CONTAINING FROM ABOUT 1% TO ABOUT 5% BY WEIGHT SULFURIC ACID AND HAVING A PH OF NOT MORE THAN 2.0, AND (3) FIXING THE DEVELOP EMULSION LAYER, THE IMPROVEMENT COMPRISING SHORTSTOPPING THE DEVELOPMENT WITH AN AQUEOUS SHORTSTOP SOLUTION OF THE PREVIOUSLY SPECIFIED COMPOSITION AND ACIDITY AND CONTAINING, IN ADDITION, A SUBSTANCE SELECTED FROM THE GROUP CONSISTING OF FORMALDEHYDE, PARAFORMALDEHYDE, GLYOXAL, ACETONE AND METHYL ETHYL KETONE IN AN AMOUNT SUFFICIENT TO PRODUCE A CARBONYL FUNCTION CONCENTRATION THEREIN OF FROM ABOUT 4 TO ABOUT 32 GRAMS PER LITER.
Claim 2
Dependent Claim
162 words
IN THE PROCESS OF RAPDILY PRODUCING A SILVER IMAGE IN A LIGHT EXPOSED SILVER HALIDE EMULSION LAYER COMPRISING (1) DEVELOPING THE EXPOSED EMULSION LAYER WITH A SUPERACTIVE BLACK-AND WHITE DEVELOPER, (2) SHORTSTOPPING THE DEVELOPMENT BY IMMERSING THE DEVELOPED EMULSION LAYER IN AN AQUEOUS SOLUTION OF A SUBSTANCE SELECTED FROM THE GROUP CONSISTING OF SODIUM BISULFATE, POTASSIUM BISULFATE, AMMONIUM BISULFATE, SULFURIC ACID AND HYDROCHLORIC ACID HAVING AN ACID HYDROGEN CONTENT EQUIVALENT TO THAT OF AN AQUEOUS SOLUTION CONTAINING FROM ABOUT 1% TO ABOUT 5% BY WEIGHT SULFURIC ACID AND HAVING A PH OF NOT MORE THAN 2.0, AND (3) FIXING THE DEVELOP EMULSION LAYER, THE IMPROVEMENT COMPRISING SHORTSTOPPING THE DEVELOPMENT WITH AN AQUEOUS SHORTSTOP SOLUTION OF THE PREVIOUSLY SPECIFIED COMPOSITION AND ACIDITY AND CONTAINING, IN ADDITION, A SUBSTANCE SELECTED FROM THE GROUP CONSISTING OF FORMALDEHYDE, PARAFORMALDEHYDE, GLYOXAL, ACETONE AND METHYL ETHYL KETONE IN AN AMOUNT SUFFICIENT TO PRODUCE A CARBONYL FUNCTION CONCENTRATION THEREIN OF FROM ABOUT 4 TO ABOUT 32 GRAMS PER LITER.
References Cited (Backward Citations)
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US2422586A
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US2476544A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-04-17 | 1964-10-17 | 1965-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-17 | 1968-10-17 | 1969-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-17 | 1972-10-17 | 1973-04-18 | $7700.00 | Window Closed / Lapsed |