US3955996A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for spectrally sensitizing photographic light-sensitive emulsion
Assignee: Fujifilm Holdings Corp
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Filing: 1974-11-15
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Granted: 1976-05-11
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Expires: 1994-11-15
Abstract
Abstract A method for spectrally sensitizing a photographic light-sensitive emulsion, which comprises dissolving a photographic spectrally sensitizing dye having an amidinium ion auxochrome in an organic solvent containing a substantially water-free acid having a pKa not exceeding about 5, and adding this dye-containing acid-organic solvent solution to a light-sensitive emulsion.
Inventors
- 👤 Masanao Hinata
- 👤 Masanaga Ohki
- 👤 Haruo Takei
- 👤 Yuji Mihara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 18:03
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/06; G03C1/08; G03C1/10; G03C1/12
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
70 words
A method for spectrally sensitizing a photographic light-sensitive silver halide emulsion, which comprises dissolving a photographic spectrally sensitizing dye having an amidinium ion auxochrome in an acid-containing organic solvent solution consisting essentially of a water-miscible organic solvent and not more than 10% by weight of an acid having a pKa not exceeding about 5 and being substantially free of water, and adding said solution to a light-sensitive silver halide emulsion.
Claim 2
Independent Claim
70 words
A method for spectrally sensitizing a photographic light-sensitive silver halide emulsion, which comprises dissolving a photographic spectrally sensitizing dye having an amidinium ion auxochrome in an acid-containing organic solvent solution consisting essentially of a water-miscible organic solvent and not more than 10% by weight of an acid having a pKa not exceeding about 5 and being substantially free of water, and adding said solution to a light-sensitive silver halide emulsion.
Claim 3
Dependent Claim
94 words
The method for spectrally sensitizing a photographic light-sensitive silver halide emulsion as described in claim 1, wherein said photographic spectrically sensitizing dye having an amidinium ion auxochrome is represented by the following general formula (I): ##EQU3## wherein m and n each represents 1 or 2; p represents 1, 2 or 3; q represents 1 or 2; L represents a methine group; Z and Z 1 each represents the atoms necessary to complete a 5- or 6-membered nitrogen-containing heterocyclic nucleus; X represents an acid anion; and R and R 1 each represents an alcohol residue.
Claim 4
Dependent Claim
35 words
The method for spectrally sensitizing a photographic light-sensitive, silver halide emulsion as described in claim 2, wherein said dye-containing acid-organic solvent solution contains at least two of the dyes represented by the general formula [I].
Claim 5
Dependent Claim
27 words
The method for spectrally sensitizing a photographic light-sensitive, silver halide emulsion as described in claim 1, wherein said substantially water-free acid is methanesulfonic acid or ethanesulfonic acid.
Claim 6
Dependent Claim
30 words
The method for spectrally sensitizing a photographic light-sensitive silver halide emulsion as described in claim 1, wherein said acid cotains not more than 10 percent by weight water of crystallinity.
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) | 1979-05-11 | 1979-11-10 | 1980-05-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-05-11 | 1983-11-10 | 1984-05-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-05-11 | 1987-11-10 | 1988-05-11 | $7700.00 | Window Closed / Lapsed |