US3753395A
Expired / Lapsed
US
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Photo-thermographic recording process with 5-pyrazolane
Assignee: Agfa Gevaert NV
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Filing: 1971-04-08
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Granted: 1973-08-21
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Expires: 1991-04-08
Abstract
Abstract A photosensitive recording material containing a pyrazolin-5-one reducing agent having at least one hydrogen atom in its 4position in chemical interreactive relationship with a photoreducible dye capable when exposed to activiating electromagnetic radiation adsorbable by the dye of initiating oxidation of the pyrazolin-5-one reducing agent, whereby imagewise exposure of the material to such radiation causes the reducing properties of said pyrazolin-5-one agent to be substantially eliminated in the exposed areas thereof and an image recording method using the same. The material can also contain a bi-imidazolyl compound.
Inventors
- 👤 A Poot
- 👤 Besauw J Van
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 10:38
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/72; G03C1/73; G03C5/00; G03C5/56
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
32 words
uniformly heating said exposed material while being in intimate contact with a receiving material containing a substance that at the applied temperature react with the transferred pyrazolin-5-one compound forming (a) coloured product(s).
Claim 2
Dependent Claim
91 words
The method of claim 1 wherein said pyrazolin-5-one reducing agent is volatile when heated and including the steps of bringing said radiation exposed recording layer into contact with an image-forming layer containing a chemical compound reactive with said reducing agent in its unoxidized form to produce a colored reaction product and uniformly heating said recording layer while in contact with said image-forming layer to transfer volatilized reducing agent from the unexposed areas of the recording layer to the contacting areas of the image-forming material and produce a reaction product image therein.
Claim 3
Dependent Claim
11 words
A method according to claim 1, comprising the steps of :
Claim 4
Dependent Claim
18 words
A method according to claim 3, wherein the receiving material contains a substantially non-light unsensitive noble metal salt.
Claim 5
Dependent Claim
25 words
A method according to claim 3, wherein the exposure is a reflex contact exposure to a graphic original having differentially light-absorptive image and background areas.
Claim 6
Dependent Claim
14 words
A method according to claim 4, wherein the noble metal salt is silver behenate.
Claim 7
Dependent Claim
15 words
The method of claim 1 wherein said pyrazolin-5-one is a reducing agent for silver ions.
Claim 8
Dependent Claim
21 words
The method of claim 2 wherein said reactive compound is a noble metal salt, a diazonium salt, or a p-phenylene-diamine compound.
Claim 9
Dependent Claim
21 words
The method of claim 1 wherein said photosensitive recording layer also contains a bi-imidazolyl compound in admixture with said photoreducible dye.
References Cited (Backward Citations)
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US3293032A
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US3342602A
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US3359111A
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US3551151A
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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) | 1976-08-20 | 1977-02-19 | 1977-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-20 | 1981-02-19 | 1981-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-20 | 1985-02-19 | 1985-08-21 | $7700.00 | Window Closed / Lapsed |