Patent DE1492011A1 successfully refreshed from Google Patents.
US3847620A
Expired / Lapsed
US
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Method for producing silver halide photographic photosensitive emulsion
Assignee: Mitsubishi Paper Mills Ltd
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Filing: 1972-11-14
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Granted: 1974-11-12
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Expires: 1992-11-14
Abstract
Abstract A silver halide photographic emulsion excellent in photographic characteristics, stability, etc. is prepared by using a copolymeric water soluble synthetic resin essentially consisting of a carboxylic acid group, an imidazole group and an acid amide group containing N(1,1-dimethyl-3-oxobutyl) aminocarbonyl group in place of gelatin.
Inventors
- 👤 S Iguchi
- 👤 T Yano
- 👤 T Iwata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:38
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/04; G03C1/053; C; C08; C08F; C08F8/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
33 words
IN A METHOD FOR PREPARING PHOTOGRAPHIC LIGHT SENSITIVE SILVER HALIDE EMULSIONS, THE IMPROVEMENT IN SAID METHOD OF USING IN PLACE OF GELATIN A WATER SOLUBLE SYNTHETIC RESIN OF THE STRUCTURE CONSISTING ESSENTIALLY OF
Claim 2
Dependent Claim
33 words
IN A METHOD FOR PREPARING PHOTOGRAPHIC LIGHT SENSITIVE SILVER HALIDE EMULSIONS, THE IMPROVEMENT IN SAID METHOD OF USING IN PLACE OF GELATIN A WATER SOLUBLE SYNTHETIC RESIN OF THE STRUCTURE CONSISTING ESSENTIALLY OF
Claim 3
Dependent Claim
18 words
A photographic light-sensitive silver halide emulsion containing the water soluble copolymeric synthetic resin as defined in claim 1.
Claim 4
Dependent Claim
27 words
A method according to claim 1, wherein the synthetic resin is added in the form of an aqueous solution during at least one of emulsification and ripening.
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) | 1977-11-11 | 1978-05-13 | 1978-11-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-11 | 1982-05-13 | 1982-11-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-11 | 1986-05-13 | 1986-11-12 | $7700.00 | Window Closed / Lapsed |