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Patent US1381451A successfully refreshed from Google Patents.
US3168403A
Expired / Lapsed
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Flocculated gelatine emulsions containing sulphonated copolymers of styrene
Assignee: Agfa Gevaert NV
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Filing: 1962-01-03
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Granted: 1965-02-02
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Expires: 1982-01-03
Abstract
No abstract record available.
Inventors
- 👤 Himmelmann Wolfgang
- 👤 Mader Helmut
- 👤 Posse Rolf-Fred
- 👤 Ulrich Hans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:43
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/04; G03C1/053; C; C08; C08F; C08F8/00; C08F8/34; G03C1/043; C08F2800/00; C08F2800/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
142 words
A PROCESS FOR THE PRODUCTION OF A PHOTOGRAPHIC EMULSION WHICH COMPRISES COAGULATING (I) A DISPERSION OF LIGHT-SENSITIVE SILVER HALIDE PARTICLES IN AN AQUEOUS SOLUTION OF GELATIN BY THE ADDITION THERETO OF (II) AN AQUEOUS SOLUTION OF A WATER-SOLUBLE SALT OF A SULFONATED COPOLYMER OF STYRENE AND A MONOMER OF THE GROUP CONSISTING OF ACRYLIC AND METHACRYLIC ACIDS, ESTERS OF ACRYLIC AND METHACRYLIC ACIDS WITH ALIPHATIC ALCOHOLS, ACRYLAMIDE AND METHACRYLAMIDE, ACRYLONITRILE AND METHACRYLONITRILE, AND VINYLPYRROLIDONE, THE SULFONATED COPOLYMER CONTAINING BETWEEN 15 AND 60 PERCENT BY WEIGHT OF SULFO RADICALS AND BEING FORMED BY SULFONATION OF A COPOLYMERIZED MIXTURE CONSISTING OF BETWEEN 70 AND 97 PERCENT BY WEIGHT OF STYRENE AND BETWEEN 3 AND 30 PERCENT BY WEIGHT OF ONE OF THE OTHER SPECIFIED MONOMERS, SEPARATING THE COAGULUM FROM THE MIXTURE, WASHING IT WITH WATER, AND REDISPERSING IT IN ANOTHER AQUEOUS SOLUTION OF GELATIN.
Claim 2
Dependent Claim
142 words
A PROCESS FOR THE PRODUCTION OF A PHOTOGRAPHIC EMULSION WHICH COMPRISES COAGULATING (I) A DISPERSION OF LIGHT-SENSITIVE SILVER HALIDE PARTICLES IN AN AQUEOUS SOLUTION OF GELATIN BY THE ADDITION THERETO OF (II) AN AQUEOUS SOLUTION OF A WATER-SOLUBLE SALT OF A SULFONATED COPOLYMER OF STYRENE AND A MONOMER OF THE GROUP CONSISTING OF ACRYLIC AND METHACRYLIC ACIDS, ESTERS OF ACRYLIC AND METHACRYLIC ACIDS WITH ALIPHATIC ALCOHOLS, ACRYLAMIDE AND METHACRYLAMIDE, ACRYLONITRILE AND METHACRYLONITRILE, AND VINYLPYRROLIDONE, THE SULFONATED COPOLYMER CONTAINING BETWEEN 15 AND 60 PERCENT BY WEIGHT OF SULFO RADICALS AND BEING FORMED BY SULFONATION OF A COPOLYMERIZED MIXTURE CONSISTING OF BETWEEN 70 AND 97 PERCENT BY WEIGHT OF STYRENE AND BETWEEN 3 AND 30 PERCENT BY WEIGHT OF ONE OF THE OTHER SPECIFIED MONOMERS, SEPARATING THE COAGULUM FROM THE MIXTURE, WASHING IT WITH WATER, AND REDISPERSING IT IN ANOTHER AQUEOUS SOLUTION OF GELATIN.
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) | 1968-02-02 | 1968-08-03 | 1969-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-02-02 | 1972-08-03 | 1973-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-02-02 | 1976-08-03 | 1977-02-02 | $7700.00 | Window Closed / Lapsed |