US3607269A
Expired / Lapsed
US
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Image-receiving elements and photographic processes employing same
Assignee: Polaroid Corp
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Filing: 1968-04-01
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Granted: 1971-09-21
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Expires: 1988-04-01
Abstract
Abstract Image receiving elements and diffusion processes employing such elements are disclosed, wherein the element comprises a support carrying a layer composed of at least two strata, including a first stratum which comprises regenerated cellulose containing a silver precipitating agent and a mercapto substituted compound, and a second stratum comprising a alkali hydrolyzable cellulose ester. Reagents initially located in a stratum of unhydrolyzed polymer are extracted from the unhydrolyzed polymer in a controlled manner during processing.
Inventors
- 👤 Richard W Young
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 00:37
CPC Classifications
G; G03; G03C; G03C8/00; G03C8/24; G03C8/26; G03C8/28
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
22 words
An image-receiving element as defined in claim 1, whereIn said second stratum comprising said cellulose ester also contains a silver precipitating agent.
Claim 2
Dependent Claim
20 words
An image-receiving element as defined in claim 1, wherein said mercapto-substituted compound improves the stability of said silver transfer image.
Claim 3
Dependent Claim
20 words
An image-receiving element as defined in claim 1, wherein said mercapto-substituted compound improves the tone of said silver transfer image.
Claim 4
Dependent Claim
26 words
An image-receiving element as defined in claim 1, wherein said stratum of regenerated cellulose contains a smaller quantity per square foot of the same mercapto-substituted compound.
Claim 5
Dependent Claim
44 words
An image-receiving element as defined in claim 1, wherein said second stratum comprising said cellulose ester contains a first mercapto-substituted compound which improves the stability of said silver transfer image and a second mercapto-substituted compound which improves the tone of said silver transfer image.
Claim 6
Dependent Claim
14 words
An image-receiving element as defined in claim 1, wherein said mercapto-substituted compound is 1-phenyl-5-mercaptotetrazole.
Claim 7
Dependent Claim
15 words
An image-receiving element as defined in claim 1, wherein said mercapto-substituted compound is imidazolidine thione.
Claim 8
Dependent Claim
16 words
An image-receiving element as defined in claim 1, wherein said silver precipitating agent comprises silver sulfide.
Claim 9
Dependent Claim
16 words
An image-receiving element as defined in claim 1, wherein said silver precipitating agent comprises nickel sulfide.
Claim 10
Dependent Claim
15 words
An image-receiving element as defined in claim 1, wherein said silver-precipitating agent comprises lead sulfide.
Claim 11
Dependent Claim
16 words
An image-receiving element as defined in claim 1, wherein said silver precipitating agent comprises colloidal gold.
Claim 12
Dependent Claim
35 words
An image-receiving element as defined in claim 1, wherein said layer includes a third stratum positioned between said first and second strata, said third stratum comprising said alkali-hydrolyzable cellulose ester and said silver precipitating agent.
Claim 13
Dependent Claim
16 words
An image-receiving element as defined in claim 1, wherein said hydrolyzable cellulose ester is cellulose diacetate.
Claim 14
Independent Claim
147 words
The method of forming a silver transfer image comprising exposing a photosensitive silver halide emulsion, developing said exposed silver halide emulsion with an aqueous alkaline processing solution including a silver halide developing agent and a silver halide solvent, forming an imagewise distribution of a diffusible silver complex as a function of said development, transferring at least a portion of said imagewise distribution of diffusible silver complex to a superposed layer composed of at least two strata, said strata including a silver receptive stratum comprising regenerated cellulose containing a silver precipitating agent to form said silver transfer image, and a second stratum on the other side of said stratum from said silver halide emulsion and comprising an alkali-hydrolyzable cellulose ester containing a mercapto-substituted compound, at least a portion of said mercapto-substituted compound being diffused to said stratum of regenerated cellulose during the formation of said silver transfer image.
Claim 15
Dependent Claim
19 words
A method as defined in claim 15, wherein said stratum of cellulose ester also contains a silver precipitating agent.
Claim 16
Dependent Claim
27 words
A method as defined in claim 15, wherein said silver halide developing agent is an N,N-dialkyl substituted hydroxylamine and said silver halide solvent is a cyclic imide.
Claim 17
Dependent Claim
35 words
A method as defined in claim 15, wherein said layer includes a third stratum positioned between said first and said second strata, said third stratum comprising said alkali-hydrolyzable cellulose ester and said silver precipitating agent.
Claim 18
Dependent Claim
15 words
A method as defined in claim 15, wherein said hydrolyzable cellulose ester is cellulose diacetate.
Claim 19
Dependent Claim
106 words
An image-receiving element for use in a silver diffusion transfer process, said element comprising a support carrying a layer composed of at least two strata, said strata including a first stratum comprising an alkali-permeable polymer containing a silver precipitating agent, and a second sTratum comprising a polymer which is hydrolyzable to said alkali-permeable polymer, said stratum of said hydrolyzable polymer being nearer said support and containing a diffusible reagent adapted to modify the photographic properties of a silver transfer image formed in said stratum of said alkali-permeable polymer, said hydrolyzable polymer being selected from the group consisting of hydrolyzable cellulose esters, polyvinyl esters and polyvinyl acetals.
Claim 20
Dependent Claim
19 words
An image-receiving element as defined in claim 20, wherein said reagent improves the stability of said silver transfer image.
Claim 21
Dependent Claim
19 words
An image-receiving element as defined in claim 20, wherein said reagent improves the tone of said silver transfer image.
Claim 22
Dependent Claim
24 words
An image-receiving element as defined in claim 20, wherein said stratum of alkali-permeable polymer contains a smaller quantity per square foot of said reagent.
Claim 23
Dependent Claim
40 words
An image-receiving element as defined in claim 18, wherein said stratum of hydrolyzable polymer contains a first compound which improves the stability of said silver transfer image and a second compound which improves the tone of said silver transfer image.
Claim 24
Independent Claim
185 words
The method of forming a silver transfer image comprising exposing a photosensitive silver halide emulsion, developing said exposed silver halide emulsion with an aqueous alkaline processing solution including a silver halide developing agent and a silver halide solvent, forming an imagewise distribution of a diffusible silver complex as a function of said development, transferring at least a portion of said imagewise distribution of diffusible silver complex to a superposed layer composed of at least two strata, said strata including a first, silver receptive stratum comprising an alkali-permeable polymer containing a silver precipitating agent to form said silver transfer image, and a second stratum positioned on the opposite side of said first stratum from said silver halide emulsion, said second stratum comprising a polymer hydrolyzable to said alkali-permeable polymer and containing a reagent which participates in the formation or improvement of said silver transfer image, said hydrolyzable polymer being selected from the group consisting of hydrolyzable cellulose esters, polyvinyl esters and polyvinyl acetals, at least a portion of said reagent being diffused to said stratum of alkali-permeable polymer during the formation of said silver transfer image.
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) | 1974-09-20 | 1975-03-22 | 1975-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-20 | 1979-03-22 | 1979-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-20 | 1983-03-22 | 1983-09-21 | $7700.00 | Window Closed / Lapsed |