Patent US3770448A successfully refreshed from Google Patents.
US3770448A
Expired / Lapsed
US
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Lightsensitive photographic material
Assignee: Agfa Gevaert AG
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Filing: 1971-04-26
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Granted: 1973-11-06
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Expires: 1991-04-26
Abstract
Abstract Photographic images are obtained by a dry process by imagewise exposing and then heating a light-sensitive material containing a substantially non-lightsensitive silver salt, a compound of the pyrazolin-5-on series capable of reducing the silver salt at a temperature of between 60* and 160* C in the presence of photolytically formed heavy metal nuclei and a light-sensitive silver or other heavy metal compound capable of forming such nuclei upon exposure to light.
Inventors
- 👤 A Poot
- 👤 F Heugebaert
- 👤 E Brinckman
- 👤 A Kunig
- 👤 H Kampfer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:49
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/494; G03C1/498; G03C1/49827
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
15 words
The composition of claim 1, wherein the photosensitive heavy metal salt is a silver halide.
Claim 2
Dependent Claim
32 words
The composition of claim 1, wherein the heavy metal salt is present in a quantity of from 0.05 to 0.2 percent by weight, based on the weight of the non-lightsensitive silver salt.
Claim 3
Dependent Claim
19 words
The composition of claim 1, wherein the non-light-sensitive silver salt is a silver salt of a long-chain fatty acid.
Claim 4
Dependent Claim
13 words
The composition of claim 1, wherein the non-light-sensitive silver salt is silver behenate.
Claim 5
Dependent Claim
24 words
The composition of claim 1, wherein the non-light-sensitive silver salt is a silver salt of an aliphatic carboxylic acid substituted by a thioether group.
Claim 6
Dependent Claim
18 words
The composition of claim 1 in which the silver halide compound is a silver salt formed in situ.
Claim 7
Dependent Claim
24 words
The composition of claim 1 in which the silver halide compound is a silver salt formed on the surface of the non-lightsensitive silver compound.
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) | 1976-11-05 | 1977-05-07 | 1977-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-05 | 1981-05-07 | 1981-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-05 | 1985-05-07 | 1985-11-06 | $7700.00 | Window Closed / Lapsed |