US4352874A
Expired / Lapsed
US
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Method for forming a photosensitive silver halide element
Assignee: Polaroid Corp
•
Filing: 1981-09-02
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Granted: 1982-10-05
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Expires: 2001-09-02
Abstract
Abstract A fine-grain emulsion in a plurality of predetermined spaced depressions is coalesced to form, in situ, a plurality of single effective silver halide grains in a predetermined spaced array by the action of a solution of a silver halide solvent containing a dissolved silver salt.
Inventors
- 👤 Edwin H. Land
- 👤 Vivian K. Walworth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 05:07
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/015; Y; Y10; Y10S; Y10S430/00; Y10S430/136; Y10S430/149
Claims Analysis
Total Claims: 37
Claim 1
Independent Claim
56 words
In a method for forming a photosensitive element comprising a plurality of single effective silver halide grains which method comprises coalescing a fine-grain silver halide emulsion in a plurality of predetermined spaced depressions in a surface, the improvement which comprises carrying out said coalescence with a solution of silver halide solvent containing a dissolved silver salt.
Claim 2
Dependent Claim
56 words
In a method for forming a photosensitive element comprising a plurality of single effective silver halide grains which method comprises coalescing a fine-grain silver halide emulsion in a plurality of predetermined spaced depressions in a surface, the improvement which comprises carrying out said coalescence with a solution of silver halide solvent containing a dissolved silver salt.
Claim 3
Dependent Claim
11 words
The method of claim 1 wherein said surface is substantially planar.
Claim 4
Dependent Claim
19 words
The method of claim 1 wherein said silver salt is present in at least a 0.2% concentration as silver.
Claim 5
Dependent Claim
19 words
The method of claim 3 wherein said silver salt is present in at least a 0.5% concentration as silver.
Claim 6
Dependent Claim
18 words
The method of claim 4 wherein said solution of silver halide solvent is saturated with said silver salt.
Claim 7
Dependent Claim
18 words
The method of claim 1 which includes the step of depositing said fine-grain emulsion in said spaced depressions.
Claim 8
Dependent Claim
19 words
The method of claim 1 wherein said fine-grain emulsion comprises grains about 0.01 to 0.50 um in average diameter.
Claim 9
Dependent Claim
18 words
The method of claim 7 wherein said fine-grain emulsion comprises grains about 0.1 um or less in diameter.
Claim 10
Dependent Claim
17 words
The method of claim 1 wherein said fine-grain emulsion has a binder-to-silver ratio of 0.1 or less.
Claim 11
Dependent Claim
14 words
The method of claim 8 wherein said binder to silver ratio is about 0.075.
Claim 12
Dependent Claim
13 words
The method of claim 1 wherein said silver halide solvent is ammonium thiocyanate.
Claim 13
Dependent Claim
12 words
The method of claim 1 wherein said silver salt is silver thiocyanate.
Claim 14
Dependent Claim
12 words
The method of claim 1 wherein said silver salt is silver bromide.
Claim 15
Dependent Claim
17 words
The method of claim 1 wherein said solution of silver halide solvent includes a polymeric binder material.
Claim 16
Dependent Claim
12 words
The method of claim 13 wherein said polymeric binder material is gelatin.
Claim 17
Dependent Claim
24 words
The method of claim 1 wherein said coalescence includes the application of heat subsequent to the application of said solution of silver halide solvent.
Claim 18
Dependent Claim
17 words
The method of claim 16 which includes the step of cooling subsequent to said application of heat.
Claim 19
Dependent Claim
15 words
The method of claim 1 wherein a cover sheet is overlaid said depressions during coalescence.
Claim 20
Dependent Claim
15 words
The method of claim 18 wherein said cover sheet is removed subsequent to said coalescence.
Claim 21
Independent Claim
86 words
A method for forming a photosensitive element comprising a plurality of single effective silver halide grains in a predetermined spaced array which comprises the following steps in sequence: (a) depositing a fine-grain silver halide emulsion in a surface containing a plurality of predetermined spaced depressions; (b) applying a solution of silver halide solvent saturated with a silver salt in an amount sufficient to partially dissolve said grains in said depressions; said (c) coalescing said grains to a single effective silver halide grain in substantially each depression.
Claim 22
Independent Claim
86 words
A method for forming a photosensitive element comprising a plurality of single effective silver halide grains in a predetermined spaced array which comprises the following steps in sequence: (a) depositing a fine-grain silver halide emulsion in a surface containing a plurality of predetermined spaced depressions; (b) applying a solution of silver halide solvent saturated with a silver salt in an amount sufficient to partially dissolve said grains in said depressions; said (c) coalescing said grains to a single effective silver halide grain in substantially each depression.
Claim 23
Dependent Claim
28 words
The method of claim 20 which includes the step of applying a cover sheet over said depressions substantially contemporaneously with the application of said solution of silver solvent.
Claim 24
Dependent Claim
35 words
The method of claim 20 wherein said solution of silver halide solvent is disposed in a nip formed by a cover sheet and said surface and applying pressure to said cover sheet and said surface.
Claim 25
Dependent Claim
22 words
The method of claim 22 wherein said pressure is applied by passing said cover sheet and said surface between pressure applying rollers.
Claim 26
Dependent Claim
21 words
The method of claim 20 wherein said coalescence includes the application of heat subsequent to said partial dissolution of said emulsion.
Claim 27
Dependent Claim
17 words
The method of claim 24 which includes the step of cooling subsequent to said application of heat.
Claim 28
Dependent Claim
15 words
The method of claim 22 wherein said cover sheet is removed subsequent to said coalescence.
Claim 29
Dependent Claim
19 words
The method of claim 20 wherein said fine-grain emulsion comprises grains about 0.01 to 0.50 μm in average diameter.
Claim 30
Dependent Claim
18 words
The method of claim 27 wherein said fine-grain emulsion comprises grains about 0.1 μm or less in diameter.
Claim 31
Dependent Claim
18 words
The method of claim 20 wherein said fine-grain emulsion has a binder-to-silver ratio of about 0.1 or less.
Claim 32
Dependent Claim
14 words
The method of claim 29 wherein said binder to silver ratio is about 0.075.
Claim 33
Dependent Claim
13 words
The method of claim 20 wherein said silver halide solvent is ammonium thiocyanate.
Claim 34
Dependent Claim
12 words
The method of claim 20 wherein said silver salt is silver thiocyanate.
Claim 35
Dependent Claim
12 words
The method of claim 20 wherein said silver salt is silver bromide.
Claim 36
Dependent Claim
16 words
The method of claim 20 wherein said solution of silver solvent includes a polymeric binder material.
Claim 37
Dependent Claim
12 words
The method of claim 34 wherein said polymeric binder material is gelatin.
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) | 1985-10-04 | 1986-04-05 | 1986-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-10-04 | 1990-04-05 | 1990-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-10-04 | 1994-04-05 | 1994-10-05 | $7700.00 | Window Closed / Lapsed |