Patent US5045399A successfully refreshed from Google Patents.
Patent US3153593A successfully refreshed from Google Patents.
US3153593A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of silver halide emulsions
Assignee: Gevaert Photo Producten NV
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Filing: 1962-05-07
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Granted: 1964-10-20
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Expires: 1982-05-07
Abstract
No abstract record available.
Inventors
- 👤 Pauw Alfons Jozef De
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:30
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/015
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
161 words
A PROCESS FOR THE NAUFACTURE OF HIGH SENSITIVE NEUTRAL AND AMMONIACAL SILVER HALIDE EMULSIONS COMPRISING: (1) PREPARING A SILVER HALIDE DISPERSION BY REACTING A WATER-SOLUBLE HALDIE WITH SILVER NITRATE IN A MEDIUM SELECTED FROM THE GROUP CONSISTING OF NEUTRAL AND AMMONIACAL AQUEOUS MEDIA, SAID MEDIUM CONTAINING GELATING IN AN AMOUNT NOT IN EXCESS OF ABOUT 2% AND WITHIN THE RANGE OF 2-25% OF SAID SILVER NITRATE, (2) INTRODUCING INTO SAID DISPERSION A CONCENTRATED SOLUTION OF AMMONIUM SULFATE IN AN AMOUNT SUFFICIENT TO CO-PREICPITATE SAID GELATIN AND SILVER HALIDE BUT NOT SUFFICIENT TO DECREASE THE PH OF SAID MEDIUM BELOW ABOUT PH 7. (3) DRAINING OFF THE SUPERNATANT LIQUID, (4) ADMIXING ADDITIONAL CONCENTRATED SOLUUTION OF AMMONIUM SULFATE TO REVERSIBLY HARDEN SAID COPREICIPITATED GELATIN, (5) WASHING AND DECANTING SAID CO-PRECIPITANT TO REMOVE SOLUBLE SALTS THEREFROM, (6) HEATING AND STIRRING SAID CO-PRECIPITATE TO REDISPERSE SAID SILVER HALIDE, AND (7) USING THE SILVER HALIDE DISPERSION THUS OBTAINED TO PRODUCE THE ULTIMATE LIGHT-SENSITIVE SILVER HALIDE EMULSION.
Claim 2
Dependent Claim
161 words
A PROCESS FOR THE NAUFACTURE OF HIGH SENSITIVE NEUTRAL AND AMMONIACAL SILVER HALIDE EMULSIONS COMPRISING: (1) PREPARING A SILVER HALIDE DISPERSION BY REACTING A WATER-SOLUBLE HALDIE WITH SILVER NITRATE IN A MEDIUM SELECTED FROM THE GROUP CONSISTING OF NEUTRAL AND AMMONIACAL AQUEOUS MEDIA, SAID MEDIUM CONTAINING GELATING IN AN AMOUNT NOT IN EXCESS OF ABOUT 2% AND WITHIN THE RANGE OF 2-25% OF SAID SILVER NITRATE, (2) INTRODUCING INTO SAID DISPERSION A CONCENTRATED SOLUTION OF AMMONIUM SULFATE IN AN AMOUNT SUFFICIENT TO CO-PREICPITATE SAID GELATIN AND SILVER HALIDE BUT NOT SUFFICIENT TO DECREASE THE PH OF SAID MEDIUM BELOW ABOUT PH 7. (3) DRAINING OFF THE SUPERNATANT LIQUID, (4) ADMIXING ADDITIONAL CONCENTRATED SOLUUTION OF AMMONIUM SULFATE TO REVERSIBLY HARDEN SAID COPREICIPITATED GELATIN, (5) WASHING AND DECANTING SAID CO-PRECIPITANT TO REMOVE SOLUBLE SALTS THEREFROM, (6) HEATING AND STIRRING SAID CO-PRECIPITATE TO REDISPERSE SAID SILVER HALIDE, AND (7) USING THE SILVER HALIDE DISPERSION THUS OBTAINED TO PRODUCE THE ULTIMATE LIGHT-SENSITIVE SILVER HALIDE EMULSION.
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) | 1967-10-20 | 1968-04-20 | 1968-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-10-20 | 1972-04-20 | 1972-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-10-20 | 1976-04-20 | 1976-10-20 | $7700.00 | Window Closed / Lapsed |