US4451560A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chemical sensitization of silver halide grains
Assignee: Polaroid Corp
•
Filing: 1982-11-15
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Granted: 1984-05-29
•
Expires: 2002-11-15
Abstract
Abstract A method for forming a photosensitive element which comprises contacting silver halide in a plurality of spaced depressions in a surface with a mixture of a silver halide solvent and preformed sensitivity centers.
Inventors
- 👤 Arthur M. Gerber
- 👤 Judith Loucks
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 00:37
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; Y; Y10; Y10S; Y10S430/00; Y10S430/149
Claims Analysis
Total Claims: 35
Claim 1
Independent Claim
51 words
A method for forming a photosensitive element which comprises contacting silver halide in a plurality of spaced depressions in a surface with a mixture of a silver halide solvent and a chemically sensitized fine-grain silver halide emulsion, thereby forming a chemically sensitized single effective silver halide grain in substantially each depression.
Claim 2
Independent Claim
51 words
A method for forming a photosensitive element which comprises contacting silver halide in a plurality of spaced depressions in a surface with a mixture of a silver halide solvent and a chemically sensitized fine-grain silver halide emulsion, thereby forming a chemically sensitized single effective silver halide grain in substantially each depression.
Claim 3
Dependent Claim
19 words
The method of claim 1 wherein said silver halide in each of said depressions is a single effective grain.
Claim 4
Dependent Claim
19 words
The method of claim 1 wherein said silver halide in each of said depressions is a single effective grain.
Claim 5
Dependent Claim
47 words
The method of claim 1 wherein said silver halide in said depressions is contacted with a coalescing amount of silver halide solvent solution and the thus-formed single effective grains are then contacted with a mixture of said chemically sensitized fine-grain silver halide emulsion and silver halide solvent.
Claim 6
Dependent Claim
32 words
The method of claim 1 wherein said silver halide in said depressions is contacted substantially contemporaneously with a coalescing amount of silver halide solvent and said chemically sensitized fine-grain silver halide emulsion.
Claim 7
Dependent Claim
28 words
The method of claim 1 wherein the grains of said chemically sensitized fine-grain silver halide emulsion are substantially the same size as said silver halide in said depressions.
Claim 8
Dependent Claim
29 words
The method of claim 6 wherein said silver halide in said depressions comprises a fine-grain silver halide emulsion having silver halide grains about 0.01 to 0.50 μm in diameter.
Claim 9
Dependent Claim
21 words
The method of claim 7 wherein said fine-grain silver halide emulsion consists of grains about 0.1 μm or less in diameter.
Claim 10
Dependent Claim
22 words
The method of claim 7 wherein said fine-grain silver halide emulsion has a binder to silver ratio of about 0.10 or less.
Claim 11
Dependent Claim
14 words
The method of claim 7 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
20 words
The method of claim 1 wherein said silver halide solvent is a solution containing both ammonium thiocyanate and potassium bromide.
Claim 14
Dependent Claim
19 words
The method of claim 1 wherein said chemically sensitized fine-grain silver halide emulsion is sensitized with sulfur and gold.
Claim 15
Dependent Claim
18 words
The method of claim 1 wherein said silver halide solvent includes a solution of a polymeric binder material.
Claim 16
Dependent Claim
12 words
The method of claim 14 wherein said polymeric binder material is gelatin.
Claim 17
Dependent Claim
25 words
The method of claim 4 wherein said silver halide is contacted with said coalescing amount of silver halide solvent solution with the application of heat.
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
Independent Claim
88 words
A method for forming a photosensitive element comprising a plurality of single effective silver halide grains in a spaced array which comprises the following steps in sequence: (a) depositing a fine-grain silver halide emulsion in a plurality of spaced depressions in a surface; (b) applying a solution of silver halide solvent containing a chemically sensitized fine-grain silver halide emulsion to said fine-grain silver halide emulsion in each depression; and (c) coalescing said silver halide grains to a chemically sensitized single effective silver halide grain in substantially each depression.
Claim 20
Independent Claim
88 words
A method for forming a photosensitive element comprising a plurality of single effective silver halide grains in a spaced array which comprises the following steps in sequence: (a) depositing a fine-grain silver halide emulsion in a plurality of spaced depressions in a surface; (b) applying a solution of silver halide solvent containing a chemically sensitized fine-grain silver halide emulsion to said fine-grain silver halide emulsion in each depression; and (c) coalescing said silver halide grains to a chemically sensitized single effective silver halide grain in substantially each depression.
Claim 21
Dependent Claim
29 words
The method of claim 18 which includes the step of applying a cover sheet over said depressions substantially contemporaneously with the application of said solution of silver halide solvent.
Claim 22
Dependent Claim
38 words
The method of claim 19 wherein said solution of silver halide solvent is disposed in a nip formed by a cover sheet and said depressions and applying pressure to said cover sheet and the element comprising said depressions.
Claim 23
Dependent Claim
25 words
The method of claim 20 wherein said pressure is applied by passing said cover sheet and the element comprising said depressions between pressure applying rollers.
Claim 24
Dependent Claim
13 words
The method of claim 18 wherein said coalescence includes the application of heat.
Claim 25
Dependent Claim
17 words
The method of claim 22 which includes the step of cooling subsequent to said application of heat.
Claim 26
Dependent Claim
15 words
The method of claim 19 wherein said cover sheet is removed subsequent to said coalescence.
Claim 27
Dependent Claim
24 words
The method of claim 18 wherein said chemically sensitized fine-grain silver halide emulsion is substantially the same size as said fine-grain silver halide emulsion.
Claim 28
Dependent Claim
22 words
The method of claim 18 wherein said fine-grain silver halide emulsion comprises silver halide grains about 0.01 to 0.50 μm in diameter.
Claim 29
Dependent Claim
20 words
The method of claim 26 wherein said fine-grain silver halide emulsion comprises grains about 0.1 μm or less in diameter.
Claim 30
Dependent Claim
22 words
The method of claim 18 wherein said fine-grain silver halide emulsion has a binder to silver ratio of about 0.10 or less.
Claim 31
Dependent Claim
14 words
The method of claim 28 wherein said binder to silver ratio is about 0.075.
Claim 32
Dependent Claim
13 words
The method of claim 18 wherein said silver halide solvent is ammonium thiocyanate.
Claim 33
Dependent Claim
20 words
The method of claim 18 wherein said silver halide solvent of a solution containing both ammonium thiocyanate and potassium bromide.
Claim 34
Dependent Claim
19 words
The method of claim 18 wherein said chemically sensitized fine-grain silver halide emulsion is sensitized with sulfur and gold.
Claim 35
Dependent Claim
23 words
The method of claim 1 wherein said chemically sensitized silver halide emulsion consists of not more than 5% of the total silver halide.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-05-29 | 1987-11-28 | 1988-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-29 | 1991-11-28 | 1992-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-29 | 1995-11-28 | 1996-05-29 | $7700.00 | Window Closed / Lapsed |