Patent US3721560A successfully refreshed from Google Patents.
US3721560A
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Photothermographic material containing a photosensitive metal oxide semiconductor or benzophenone and a free metal generating alkanolamine
Assignee: Agfa Gevaert NV
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Filing: 1971-05-10
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Granted: 1973-03-20
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Expires: 1991-05-10
Abstract
Abstract A photosensitive recording material comprising a metalcontaining amino-alcohol reaction product yielding free metal on heating and in inter-reactive relationship with said product a photosensitive substance, which in photo-exposed state lowers the decomposition temperature of said product. The preferred reaction product is a reaction product of yellow lead(II)oxide and tri-isopropanolamine. Preferred photosensitive substances are photoconductive lead(II)oxide, zinc oxide and titanium(IV)oxide.
Inventors
- 👤 F Heugebaert
- 👤 E Brinckman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:43
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/705
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
26 words
A photosensitive recording material according to claim 1, wherein the derivative alone is stable up to 100*C but above said temperature decomposes and yields free metal.
Claim 2
Dependent Claim
43 words
A photosensitive recording material according to claim 1, wherein said organometallic derivative is a reaction product of an alkanolamine and a metal compound selected from yellow lead(II) oxide (massicot), red lead(II) oxide (litharge), copper(II) acetylacetonate, zinc acetyl-acetonate, mercury(II) arsenite, thallium(III) arsenite, and HO-Pb-S-CH2-CH2-OH.
Claim 3
Dependent Claim
17 words
A photosensitive recording material according to claim 3, wherein the reaction product has the following structural formula:
Claim 4
Dependent Claim
28 words
A photosensitive recording material according to claim 1, wherein the photosensitive substance and organometallic derivative are used in a same layer in admixture with a film-forming binding agent.
Claim 5
Dependent Claim
28 words
A photosensitive recording material according to claim 1, wherein the organometallic derivative and photosensitive substance are present in separate layers that are in intimate contact with each other.
Claim 6
Independent Claim
90 words
A method of recording information comprising the steps of information-wise exposing to activating electromagnetic radiation a photosensitive recording material comprising an organometallic derivative of an alkanolamine yielding free metal on heating and in interreactive relationship with said derivative a photosensitive substance, which in photo-exposed state lowers the decomposition temperature of said derivative, and heating said recording material during or after exposure to develop a visible image in the unexposed areas thereof, said photosensitive substance being benzophenone or at least one oxygen-containing inorganic semiconductive compound of lead, titanium, zinc or bismuth.
Claim 7
Dependent Claim
24 words
A recording material according to claim 1 wherein the metallic atoms of said organometallic derivative are of the same metal as the semiconductive compound.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-03-19 | 1976-09-18 | 1977-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-19 | 1980-09-18 | 1981-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-19 | 1984-09-18 | 1985-03-20 | $7700.00 | Window Closed / Lapsed |