US3933496A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Direct-positive photographic material and method for its production
Assignee: ZLAFOP PRI BAN
•
Filing: 1973-11-15
•
Granted: 1976-01-20
•
Expires: 1993-11-15
Abstract
Abstract This invention relates to a photographic material yielding upon exposure a direct-positive image and to a process for the production of such material.
Inventors
- 👤 Konstantin Nikolaev Kolev
- 👤 Jordan Petrov Malinowski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:49
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/705; G03C1/005; G03C1/485; G03C1/494; G03C1/496; G03C1/4965
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
157 words
A photographic material capable of yielding on imagewise exposure to radiation a direct positive image, which material comprises: a non-metallic carrier base; and on the carrier base, a layer of metal salt selected from the group consisting of halides of divalent tin, divalent lead, trivalent titanium and stannous sulfide and a layer of at least one photo-sensitive compound selected from the group consisting of the halides of silver, cadmium, lead, bismuth, thallium, zinc, copper and mercury and chalcogenides or oxides of arsenic, lead, cadmium, and antimony, said photosensitive compound being capable when activated upon exposure to radiation of reacting chemically with said metal salt layer in a manner such that in any region exposed to radiation the metal salt layer loses its catalytic activity to a metallization baths, and in any region not exposed to radiation the said metal salt layer remains intact, thereby forming a positive latent image which is visualized on intensification by chemical metallization.
Claim 2
Dependent Claim
157 words
A photographic material capable of yielding on imagewise exposure to radiation a direct positive image, which material comprises: a non-metallic carrier base; and on the carrier base, a layer of metal salt selected from the group consisting of halides of divalent tin, divalent lead, trivalent titanium and stannous sulfide and a layer of at least one photo-sensitive compound selected from the group consisting of the halides of silver, cadmium, lead, bismuth, thallium, zinc, copper and mercury and chalcogenides or oxides of arsenic, lead, cadmium, and antimony, said photosensitive compound being capable when activated upon exposure to radiation of reacting chemically with said metal salt layer in a manner such that in any region exposed to radiation the metal salt layer loses its catalytic activity to a metallization baths, and in any region not exposed to radiation the said metal salt layer remains intact, thereby forming a positive latent image which is visualized on intensification by chemical metallization.
Claim 3
Dependent Claim
35 words
A photographic material according to claim 1, wherein the thickness of the light-sensitive layer corresponds to 10 - 6 up to 10 - 3 g/cm 2 , preferably 10 - 4 g/cm 2 light-sensitive substance.
Claim 4
Dependent Claim
88 words
A process for the production of a photographic material according to claim 1, capable of yielding on light exposure a direct positive image, which comprises depositing onto a non-metallic carrier base and in intimate contact inbetween of thin layers and light-sensitive substance, which substance upon exposure to light reacts chemically with the metal salt in such a way that in the lighted areas the metal ions of the salt lose their catalytic-active properties, but remain unchanged in the non-lighted areas thereby forming an image capable of being intensified.
Claim 5
Dependent Claim
31 words
A process according to claim 3, wherein the thin layer of said metal salt is obtained by evaporation in vacuum or by dipping in a solution of the corresponding metal salt.
Claim 6
Dependent Claim
48 words
A process for producing a direct image according to claim 3, wherein, when the layer of light-sensitive substance is applied onto the layer of metal salt, said layer is removed prior to development by dissolving in suitable solvents, whereby the obtained image is stabilized against further light exposure.
Claim 7
Dependent Claim
44 words
A process according to claim 3, wherein, after a previous activation of the exposed photographic material by dipping in a solution of a salt of A NOBLE METAL, the positive latent image is intensified and becomes visible by conventional chemical metallization or physical development.
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) | 1979-01-19 | 1979-07-21 | 1980-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-01-19 | 1983-07-21 | 1984-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-01-19 | 1987-07-21 | 1988-01-20 | $7700.00 | Window Closed / Lapsed |