US3660101A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic materials and processes
Assignee: Eastman Kodak Co
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Filing: 1969-04-30
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Granted: 1972-05-02
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Expires: 1989-04-30
Abstract
Abstract Dispersions useful in spectrally sensitizing photographic materials are provided which comprise spectral sensitizing dyes dissolved in a hydrophilic colloid. Methods for the preparation of such dispersions are also provided which feature dissolving the dye in an organic solvent, and adding the dye solution to the hydrophilic colloid.
Inventors
- 👤 James M Owens
- 👤 James L Graham
- 👤 Edward A Pilsworth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:47
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/06; G03C1/08; G03C1/10; G03C1/102; G03C1/705
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
94 words
The process of preparing dispersions useful in spectrally sensitizing photosensitive materials which comprises: a. providing a saturated solution of a substantially water-insoluble silver halide spectral sensitizing dye in organic solvent by heating a mixture of the dye and solvent at a temperature of at least 175*F, said organic solvent having a boiling point of at least 175*F and being partially water-miscible; b. adding the heated solvent solution of dye to gelatin which is essentially free from photosensitive material and organic solvent; c. milling the gelatin; and, d. cooling the dispersion of dye in gelatin.
Claim 2
Dependent Claim
59 words
A composition of matter useful in spectrally sensitizing photosensitive materials which comprises a hydrophilic colloid essentially free from photosensitive material and organic solvent, said colloid having uniformly dispersed therein a substantially water-insoluble silver halide spectral sensitizing cyanine dye, the particle size of the dye in said hydrophilic colloid being on an average less than about 1 micron in diameter.
Claim 3
Dependent Claim
76 words
The process of preparing dispersions useful in spectrally sensitizing photosensitive materials which comprises: a. dissolving a substantially water-insoluble silver halide spectral sensitizing dye in a volatile, water-miscible solvent; b. adding the solution obtained in (a) to a hydrophilic colloid which is essentially free from photosensitive material and organic solvent; and, c. heating the mixture obtained in (b) to vaporize the solvent from the hydrophilic colloid, thereby providing a fine dispersion of dye crystals in the colloid.
Claim 4
Dependent Claim
57 words
A composition of matter useful in spectrally sensitizing photosensitive materials which comprises a hydrophilic colloid essentially free from photosensitive material and organic solvent, said colloid having uniformly dispersed therein a substantially water-insoluble silver halide sensitizing dye, the particle size of the dye in said hydrophilic colloid being on an average less than about 1 micron in diameter.
Claim 5
Dependent Claim
54 words
A composition of matter useful in spectrally sensitizing photosensitive materials which comprises gelatin essentially free from photosensitive material and organic solvent, some gelatin having uniformly dispersed therein a substantially water-insoluble silver halide spectral sensitizing dye, the particle size of the dye in gelatin being on an average less than about 1 micron in diameter.
Claim 6
Dependent Claim
85 words
The process of preparing dispersions useful in spectrally sensitizing photosensitive materials which comprises: a. providing a saturated solution of a substantially water-insoluble photographic silver halide spectral sensitizing thiacyanine dye in phenoxy ethanol heated to about 220*F; and, b. adding the heated solution of dye to 10 percent aqueous gelatin which is essentially free from photosensitive material and organic solvent, and milling the gelatin containing the dye, the dye being present in a concentration of about 2 grams of dye per pound of the gelatin-dye composition.
Claim 7
Dependent Claim
74 words
A composition of matter useful in spectrally sensitizing photographic gelatin silver halide emulsions which comprises gelatin essentially free from photosensitive material and organic solvent, said gelatin having uniformly dispersed therein a substantially water-insoluble sensitizing thiacyanine dye, the particle size of the dye in said gelatin being on an average less than about 1 micron in diameter, said dye being present in a concentration of about 2 grams dye per pound of the gelatin-dye composition.
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) | 1975-05-02 | 1975-11-01 | 1976-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-02 | 1979-11-01 | 1980-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-02 | 1983-11-01 | 1984-05-02 | $7700.00 | Window Closed / Lapsed |