Patent US3223528A successfully refreshed from Google Patents.
US3223528A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gelatin derivatives and photographic silver halide emulsion layers
Assignee: Individual
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Filing: 1961-07-18
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Granted: 1965-12-14
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Expires: 1981-07-18
Abstract
No abstract record available.
Inventors
- 👤 Vrancken Marcel Nicolas
- 👤 Cat Arthur Henri De
- 👤 Willems Jozef Frans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 17:45
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/04; G03C1/047; G03C7/00; G03C7/30; G03C7/32; G03C7/327
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
104 words
A METHOD OF PREPARING A HARDENED PHOTOGRAPHIC GELATINO SILVER HALIDE EMULSION WHICH COMPRISES THE STEPS OF ADDING TO AN AQUEOUS SOLUTION OF SILVER NITRATE AN AQUEOUS SOLUTION OF A POTASSIUM HALIDE CONTAINING ALSO 20% BY WEIGHT BASED ON THE SILVER NITRATE OF A SULFONYL DERIVATIVE OF GELATIN PREPARED ACCORDING TO THE METHOD DESCRIBED IN CLAIM 3, ACIDIFYING THE EMULSION OBTAINED TO PRECIPITATE SAID SULFONYL DERIVATIVE OF GELATIN TOGETHER WITH THE SILVER HALIDE, WASHING THIS PRECIPITATE WITH WATER, REDISSOLVING SAID SULFONYL DERIVATIVE OF GELATIN BY ADDING WATER TO SAID PRECIPITATE,HEATING TO ABOUT 45*C., AND ACIDIFYING TO PH 6.5, AND ADDING REQUIRED AMOUNT OF BINDING AGENT.
Claim 2
Independent Claim
81 words
A METHOD OF PREPARING SULFONYL DERIVATIVES OF GELATIN WHICH COMPRISES ADDING TO A 9-20% AQUEOUS SOLUTION OF GELATIN OF PH 8-10 WHILST VIGOROUSLY STIRRING, A SOLUTION IN A SOLVENT SELECTED FROM THE GROUP CONSISTING OF DIMETHYLFORMAMIDE AND ACETONE OF AN AROMATIC COMPOUND CONTAINING A FLUOROSULFONYL GROUP SELECTED FROM THE GROUP CONSISTING OF P-TOLUENE SULFOFLUORIDE, P-AMINOBENZENE SULFOFLORIDE, M-FLUOROSULFONYL BENZOIC ACID, P-FLUOROSULFONYL ACETANILIDE, P-FLUOROSULFONYL, SALICYLIC ACID AND BENZOYL-(3-FLUOROSULFONYL)-ACETANILIDE, SAID AROMATIC COMPOUND REACTING WITH SAID GELATIN IN SOLUTION TO PRODUCE SAID SULFONYL GELATIN DERIVATIVE.
Claim 3
Independent Claim
81 words
A METHOD OF PREPARING SULFONYL DERIVATIVES OF GELATIN WHICH COMPRISES ADDING TO A 9-20% AQUEOUS SOLUTION OF GELATIN OF PH 8-10 WHILST VIGOROUSLY STIRRING, A SOLUTION IN A SOLVENT SELECTED FROM THE GROUP CONSISTING OF DIMETHYLFORMAMIDE AND ACETONE OF AN AROMATIC COMPOUND CONTAINING A FLUOROSULFONYL GROUP SELECTED FROM THE GROUP CONSISTING OF P-TOLUENE SULFOFLUORIDE, P-AMINOBENZENE SULFOFLORIDE, M-FLUOROSULFONYL BENZOIC ACID, P-FLUOROSULFONYL ACETANILIDE, P-FLUOROSULFONYL, SALICYLIC ACID AND BENZOYL-(3-FLUOROSULFONYL)-ACETANILIDE, SAID AROMATIC COMPOUND REACTING WITH SAID GELATIN IN SOLUTION TO PRODUCE SAID SULFONYL GELATIN DERIVATIVE.
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) | 1968-12-13 | 1969-06-14 | 1969-12-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-12-13 | 1973-06-14 | 1973-12-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-12-13 | 1977-06-14 | 1977-12-14 | $7700.00 | Window Closed / Lapsed |