Patent US3772025A successfully refreshed from Google Patents.
US3772025A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Diffusion transfer receiving sheets
Assignee: Polaroid Corp
•
Filing: 1972-06-19
•
Granted: 1973-11-13
•
Expires: 1992-06-19
Abstract
Abstract Image-receiving elements for use in forming images in silver by diffusion transfer processes are prepared by forming a dispersion of an insoluble silver precipitating agent in an alkaliimpermeable polymer, e.g., cellulose acetate. At least a depthwise portion of a layer of that dispersion is hydrolyzed to an alkali-permeable polymer, e.g., cellulose. The silver precipitating agent may be present in unhydrolyzed portions as well as in hydrolyzed portions. The support may be paper or a transparent film.
Inventors
- 👤 E Land
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 05:46
CPC Classifications
G; G03; G03C; G03C8/00; G03C8/24; G03C8/26; G03C8/28; G03C8/32; G03C8/36; G03C8/365
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
27 words
An image-receiving element as defined in claim 1, wherein said support is baryta paper, and said stratum of cellulose ester is coated directly upon said baryta paper.
Claim 2
Dependent Claim
15 words
An image-receiving element as defined in claim 1, wherein said cellulose ester is cellulose diacetate.
Claim 3
Dependent Claim
25 words
An image-receiving element as defined in claim 3, including a stratum of vinyl ether/maleic anhydride copolymer between said support and said stratum of cellulose diacetate.
Claim 4
Dependent Claim
58 words
An image-receiving element comprising a support carrying a silver-receptive stratum of regenerated cellulose containing a silver precipitating agent, a stratum of an alkali-hydrolyzable cellulose ester immediately contiguous the inner surface of said regenerated cellulose, said stRatum of cellulose ester also containing a silver precipitating agent, and a layer of a silver halide emulsion carried by said silver-receptive stratum.
Claim 5
Dependent Claim
16 words
An image-receiving element as defined in claim 1, wherein said silver precipitating agent is nickel sulfide.
Claim 6
Dependent Claim
23 words
A product as defined in claim 1, including a layer of a polymeric acid positioned between said support said layer of cellulose acetate.
Claim 7
Dependent Claim
21 words
A product as defined in claim 1, wherein said stratum of regenerated cellulose includes a toning agent for silver transfer images.
Claim 8
Dependent Claim
68 words
A product useful in forming image receiving layers for use in silver diffusion transfer photographic processes, said product comprising a support carrying a layer of cellulose acetate containing a silver precipitating agent distributed therein in a quantity of about 1 to 25 X 10 6 moles per square foot, said cellulose acetate layer being substantially colorless and transparent and having a thickness of less than about 0.00060 inches.
Claim 9
Dependent Claim
12 words
A product as defined in claim 9, wherein said support is transparent.
Claim 10
Dependent Claim
24 words
A product as defined in claim 9, including a layer of a polymeric acid positioned between said support and said layer of cellulose acetate.
Claim 11
Dependent Claim
21 words
A product as defined in claim 9 wherein said layer of cellulose acetate includes a toning agent for silver tranfer images.
Claim 12
Dependent Claim
13 words
A product as defined in claim 9, wherein said support is baryta paper.
Claim 13
Dependent Claim
157 words
An image-receiving element for use in silver diffusion transfer processes, said image-receiving element comprising a support and a thin substantially transparent silver-receptive stratum carried by said support, said silver-receptive stratum comprising an alkali-permeable organic polymer and a silver precipitating agent, said silver receptive stratum having been formed by vacuum depositing a normally solid silver precipitating agent upon an alkali-impermeable organic polymer in a form presenting a large surface area, mixing the resultant product with a liquid which is a solvent for said organic polymer and a nonsolvent for said vacuum deposited silver precipitating agent, thereafter dissolving said organic polymer and forming a fine dispersion comprising said vacuum deposited silver precipitating agent as the discontinuous phase and said organic polymer as at least part of the continuous phase of said dispersion, coating said dispersion in a thin stratum on said support, and hydrolyzing at least a depthwise portion of said alkali-impermeable organic polymer to said alkali-permeable organic polmer
Claim 14
Dependent Claim
23 words
An image-receiving element as defined in claim 14, wherein said alkali-permeable organic polymer is cellulose and said alkali-impermeable polymer is a cellulose ester.
Claim 15
Dependent Claim
23 words
An image-receiving element as defined in claim 14, wherein a layer of a silver halide emulsion is carried by said silver receptive stratum.
Claim 16
Dependent Claim
19 words
An image-receiving element as defined in claim 3, including a stratum of a butyl half-ester of ethylene/maleic anhydride copolymer.
Claim 17
Dependent Claim
17 words
A product as defined in claim 11, wherein said polymeric acid is a vinyl ester/maleic anhydride copolymer.
Claim 18
Dependent Claim
19 words
A product as defined in claim 11, wherein said polymeric acid is a butyl half-ester of ethylene/maleic anhydride copolymer.
References Cited (Backward Citations)
US3345165A
Cited
US3369901A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-11-12 | 1977-05-14 | 1977-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-12 | 1981-05-14 | 1981-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-12 | 1985-05-14 | 1985-11-13 | $7700.00 | Window Closed / Lapsed |