Patent US4369245A successfully refreshed from Google Patents.
US4369245A
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Photographic element for tanning development and method for obtaining colored relief image
Assignee: 3M Co
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Filing: 1981-09-08
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Granted: 1983-01-18
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Expires: 2001-09-08
Abstract
Abstract A photographic element for tanning development which comprises a support, a layer of silver halide emulsion in non-hardened gelatin including a tanning developer dispersed therein, and over said emulsion layer, a layer of non-hardened gelatin comprising at least one colored pigment dispersed therein, characterized by the silver in said silver halide emulsion layer being present in a quantity of less than 0.6 g/m2 with a silver/gelatin ratio of less than 0.4. A method for obtaining a colored relief image in such an element is shown.
Inventors
- 👤 Marco Beruto
- 👤 Piero Ramello
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 02:41
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/26; G03C5/29; G03C5/315; Y; Y10; Y10S; Y10S430/00; Y10S430/162
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
91 words
A photographic element comprising a support layer and spread over said support, a layer of silver halide emulsion in non-hardened gelatin with a tanning developer dispersed therein and, spread over said emulsion layer, a layer of non-hardened gelatin having at least one colored pigment dispersed therein, the silver of said layer of silver halide emulsion being present in a quantity of less than 0.6 grams per square meter, and the gelatin of said emulsion layer being present in a quantity such as to provide a silver/gelatin ratio of less than 0.4.
Claim 2
Dependent Claim
91 words
A photographic element comprising a support layer and spread over said support, a layer of silver halide emulsion in non-hardened gelatin with a tanning developer dispersed therein and, spread over said emulsion layer, a layer of non-hardened gelatin having at least one colored pigment dispersed therein, the silver of said layer of silver halide emulsion being present in a quantity of less than 0.6 grams per square meter, and the gelatin of said emulsion layer being present in a quantity such as to provide a silver/gelatin ratio of less than 0.4.
Claim 3
Dependent Claim
21 words
A photographic element as claimed in claim 1, wherein said silver halide comprises at least 10% by weight of silver chloride.
Claim 4
Dependent Claim
16 words
A photographic element as claimed in claim 1, wherein said tanning developer is a hydroquinone compound.
Claim 5
Dependent Claim
16 words
A photographic element as claimed in claim 1, wherein said colored pigment is an organic pigment.
Claim 6
Dependent Claim
38 words
A photographic element as claimed in claim 4, wherein said colored pigment is constituted by a plurality of pigments, the colors of which are chosen such as to be black when they are present in the same layer.
Claim 7
Dependent Claim
23 words
A photographic element as claimed in claims 2, 3 or 4, wherein a protective gelatin layer is spread over said non-sensitive gelatin layer.
Claim 8
Dependent Claim
44 words
A photographic element as claimed in claims 1, 3 or 4, wherein the silver content of said silver halide emulsion layer lies between 0.2 and 0.4 grams per square meter and the weight ratio of gelatin to tanning developer is between 3 and 8.
Claim 9
Dependent Claim
16 words
A photographic element as claimed in claim 7, wherein the silver/gelatin ratio is less than 0.2.
Claim 10
Dependent Claim
62 words
A method for obtaining a colored relief image in the photographic element of claim 1, comprising exposing said element and promoting its development by said tanning developer contained in the element by contacting the exposed element with an aqueous alkaline solution comprising a significant quantity of a solvent chosen from the class including dihydric alcohols, polyhydric alcohols and polyoxyethyleneglycols or their mixtures.
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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) | 1986-01-17 | 1986-07-19 | 1987-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-01-17 | 1990-07-19 | 1991-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-01-17 | 1994-07-19 | 1995-01-18 | $7700.00 | Window Closed / Lapsed |