US3982948A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing silver halide emulsion containing a rhodium salt and a decomposition product of nucleic acid
Assignee: Konica Minolta Inc
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Filing: 1974-06-24
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Granted: 1976-09-28
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Expires: 1994-06-24
Abstract
Abstract A process for the preparation of silver halide photographic emulsions, characterized in that a water-soluble rhodium salt and an effective stabilizing amount of a compound taken from the class consisting of adenine, guanine, uracil, cytosine and thymine is added to a silver halide photographic emulsion prior to completion of the physical ripening thereof.
Inventors
- 👤 Haruhiko Sato
- 👤 Hidehiko Ishikawa
- 👤 Katsuo Mogaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:45
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/06; G03C1/08; G03C1/09; G03C1/34; Y; Y10; Y10S; Y10S430/00; Y10S430/156; Y10S430/158; Y10S430/159
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
63 words
A process for the preparation of silver halide photographic emulsions, characterized in that a water-soluble rhodium salt and an effective stabilizing amount of at least 20 mg per mole of silver halide of a compound taken from the class consisting of adenine, guanine, uracil, cytosine and thymine is added to a silver halide photographic emulsion prior to completion of the physical ripening thereof.
Claim 2
Dependent Claim
63 words
A process for the preparation of silver halide photographic emulsions, characterized in that a water-soluble rhodium salt and an effective stabilizing amount of at least 20 mg per mole of silver halide of a compound taken from the class consisting of adenine, guanine, uracil, cytosine and thymine is added to a silver halide photographic emulsion prior to completion of the physical ripening thereof.
Claim 3
Dependent Claim
40 words
A process for the preparation of silver halide photographic emulsions according to claim 1 wherein said water-soluble rhodium salt and said compound are added to a silver halide photographic emulsion in an emulsifying step prior to said physical ripening thereof.
Claim 4
Dependent Claim
33 words
A process for the preparation of silver halide photographic emulsions according to claim 1, wherein said rhodium salt and said compound are added to a silver halide photographic emulsion in said physical ripening.
Claim 5
Dependent Claim
48 words
A process for the preparation of silver halide photographic emulsions according to claim 1 wherein one of said rhodium salt and said compound is added in an emulsifying step prior to said physical ripening and the other is added during said physical ripening to a silver halide emulsion.
Claim 6
Dependent Claim
26 words
The process of claim 1 wherein said water-soluble rhodium salt is present in the amount between about 0.005 and 0.20 mg per mole of silver halide.
Claim 7
Dependent Claim
20 words
The process of claim 5 wherein said amount is between about 50 and 150 mg per mole of silver halide.
References Cited (Backward Citations)
US3531289A
Cited
US3512982A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-09-28 | 1980-03-29 | 1980-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-09-28 | 1984-03-29 | 1984-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-09-28 | 1988-03-29 | 1988-09-28 | $7700.00 | Window Closed / Lapsed |