Patent US2982652A successfully refreshed from Google Patents.
US2982652A
Expired / Lapsed
US
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Preparation of photographic emulsions
Assignee: Gevaert Photo Producten NV
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Filing: 1957-06-18
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Granted: 1961-05-02
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Expires: 1977-06-18
Abstract
No abstract record available.
Inventors
- 👤 Pauw Alfons Jozef De
- 👤 Baekelmans Herman Elisabeth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:36
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/015
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
120 words
A PROCESS OF PREPARING A POWDERY AND VERY EASILY WASHABLE LIGHT-SENSITIVE SILVER HALIDE PRECIPITATE, COMPRISING MIXING SILVER NITRATE, AT LEAST A SINGLE WATER-SOLUBLE HALIDE, AND AN AQUEOUS SOLUTION OF GELATIN, THE GELATIN BEING USED IN A RATIO OF ABOUT 2 TO 25 GRAMS PER 100 GRAMS SILVER NITRATE, THE AMOUNT OF WATER BEING SUCH THAT THE QUANTITY OF GELATIN DOES NOT EXCEED ABOUT 3% BY WEIGHT OF THE WATER PRESENT, ALLOWING THE AQUEOUS DISPERSION FORMED TO RIPEN, AND MIXING THE RIPENED DISPERSION INTO AN APPROXIMATELY EQUAL AMOUNT OF A PRECIPITATING ORGANIC LIQUID, THEREBY OBTAINING THE DESIRED PRECIPITATE IN POWDERY FORM, SAID ORGANIC LIQUID BEING SELECTED FROM A GROUP CONSISTING OF METHYL ACETATE, ETHYL ACETATE, ETHANOL, METHANOL, ACETONE, AND THEIR MIXTURES.
Claim 2
Dependent Claim
120 words
A PROCESS OF PREPARING A POWDERY AND VERY EASILY WASHABLE LIGHT-SENSITIVE SILVER HALIDE PRECIPITATE, COMPRISING MIXING SILVER NITRATE, AT LEAST A SINGLE WATER-SOLUBLE HALIDE, AND AN AQUEOUS SOLUTION OF GELATIN, THE GELATIN BEING USED IN A RATIO OF ABOUT 2 TO 25 GRAMS PER 100 GRAMS SILVER NITRATE, THE AMOUNT OF WATER BEING SUCH THAT THE QUANTITY OF GELATIN DOES NOT EXCEED ABOUT 3% BY WEIGHT OF THE WATER PRESENT, ALLOWING THE AQUEOUS DISPERSION FORMED TO RIPEN, AND MIXING THE RIPENED DISPERSION INTO AN APPROXIMATELY EQUAL AMOUNT OF A PRECIPITATING ORGANIC LIQUID, THEREBY OBTAINING THE DESIRED PRECIPITATE IN POWDERY FORM, SAID ORGANIC LIQUID BEING SELECTED FROM A GROUP CONSISTING OF METHYL ACETATE, ETHYL ACETATE, ETHANOL, METHANOL, ACETONE, AND THEIR MIXTURES.
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) | 1964-05-01 | 1964-10-31 | 1965-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-05-01 | 1968-10-31 | 1969-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-05-01 | 1972-10-31 | 1973-05-02 | $7700.00 | Window Closed / Lapsed |