US3883355A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Crystallization of silver halide within an aqueous mixture of a water soluble silver complex and a polymeric colloid binder
Assignee: Polaroid Corp
•
Filing: 1973-07-27
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Granted: 1975-05-13
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Expires: 1993-07-27
Abstract
Abstract Silver halide emulsion layers are formed by mixing a watersoluble silver halide complex and a polymeric binder material, casting a layer of said material and crystallizing silver halide grains therein.
Inventors
- 👤 Vivian K Walworth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 05:48
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
49 words
A METHOD FOR FORMING A PHOTOGRAPHIC SILVER HALIDE EMULSION LAYER WHICH COMPRISES MIXING AN AQUEOUS SOLUTION OF A WATER-SOLUBLE COMPLEX OF SILVER HALIDE COMPLEXED BY EXCESS HALIDE AND A POLYMERIC BINDER MATEIAL, FORMING A LAYER OF SAID MIXTURE AND CRYSTALLIZING PHOTOSENSITIVE SLIVER HALIDE GRAINS IN SAID LAYER BY DECOMPLEXATION.
Claim 2
Independent Claim
49 words
A METHOD FOR FORMING A PHOTOGRAPHIC SILVER HALIDE EMULSION LAYER WHICH COMPRISES MIXING AN AQUEOUS SOLUTION OF A WATER-SOLUBLE COMPLEX OF SILVER HALIDE COMPLEXED BY EXCESS HALIDE AND A POLYMERIC BINDER MATEIAL, FORMING A LAYER OF SAID MIXTURE AND CRYSTALLIZING PHOTOSENSITIVE SLIVER HALIDE GRAINS IN SAID LAYER BY DECOMPLEXATION.
Claim 3
Dependent Claim
15 words
A method as defined in claim 1 wherein said solution of water-soluble complex is saturated.
Claim 4
Dependent Claim
16 words
A method as defined in claim 1 wherein said polymeric binder material is a natural material.
Claim 5
Dependent Claim
13 words
A method as defined in claim 3 wherein said binder material is gelatin.
Claim 6
Dependent Claim
17 words
A method as defined in claim 1 wherein said polymeric binder material is a synthetic polymeric material.
Claim 7
Dependent Claim
18 words
A method as defined in claim 1 wherein said layer is at least partially dried prior to decomplexation.
Claim 8
Dependent Claim
18 words
A method as defined in claim 1 wherein said decomplexation is accomplished by dilution with an aqueous solution.
Claim 9
Dependent Claim
13 words
A method as defined in claim 7 wherein the diluting medium is water.
Claim 10
Dependent Claim
22 words
A method as defined in claim 8 wherein the diluting medium includes an agent for modulating the crystallization of the silver halide.
Claim 11
Dependent Claim
15 words
A method as defined in claim 9 wherein said agent is a water-soluble halide salt.
Claim 12
Dependent Claim
23 words
A method as defined in claim 10 wherein said water-soluble halide salt comprises the same halide as the halide of the water-soluble complex.
Claim 13
Dependent Claim
16 words
A method as defined in claim 1 wherein said complex is a saturated silver bromide complex.
Claim 14
Dependent Claim
18 words
A method as defined in claim 1 which includes the step of washing said layer subsequent to crystallization.
Claim 15
Dependent Claim
16 words
A method as defined in claim 7 wherein said diluting medium includes a photographic sensitizing agent.
Claim 16
Dependent Claim
15 words
A method as defined in claim 14 wherein said sensitizing agent is a chemical sensitizer.
Claim 17
Dependent Claim
15 words
A method as defined in claim 14 wherein said sensitizing agent is a spectral sensitizer.
Claim 18
Dependent Claim
21 words
A method as defined in claim 1 wherein a photographic sensitizing agent is applied to said layer subsequent to crystal formation.
Claim 19
Dependent Claim
15 words
A method as defined in claim 1 wherein said solution includes a photographic sensitizing agent.
References Cited (Backward Citations)
US3600175A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-05-12 | 1978-11-11 | 1979-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-12 | 1982-11-11 | 1983-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-12 | 1986-11-11 | 1987-05-13 | $7700.00 | Window Closed / Lapsed |