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US3772029A
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Light-sensitive imaging materials
Assignee: Keuffel and Esser Co
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Filing: 1968-09-26
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Granted: 1973-11-13
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Expires: 1988-09-26
Abstract
Abstract Light-sensitive imaging materials contain a photo-activator capable of yielding a free radical by action of light and a normally-oxidizable, color-developing compound which is rendered incapable of oxidation, and thus not color-developing, by reaction with the free radical. Light exposure and treatment with an oxidizing agent renders positive image.
Inventors
- 👤 S Hoshino
- 👤 K Yumiki
- 👤 T Taira
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 16:05
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/675
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
19 words
The process according to claim 1 wherein said treating step comprises contacting said material with a fluid oxidizing agent.
Claim 2
Dependent Claim
17 words
The process according to claim 2 wherein said oxidizing agent comprises a solution of an oxidizing compound.
Claim 3
Dependent Claim
13 words
The process according to claim 2 wherein said oxidizing agent is a gas.
Claim 4
Dependent Claim
138 words
An imaging process comprising: a. exposing imagewise to light material comprising a support and a coating thereon of light-sensitive composition consisting essentially of (1) an organic halogen-containing photoactivator capable of forming a free radical by action of light and (2) a compound normally oxidizable to effect a distinct color change therein, said normally oxidizable compound being selected from the group consisting of indoxyl; 6-bromo-indoxyl; thiaindoxyl; 5-chloro-7-mEthyl-thiaindoxyl; 4-methyl-6-bromo-thiaindoxyl; and thereby imagewise forming said free radical in reactive association with said normally oxidizable compound in said composition, thus imagewise rendering said compound incapable of normal color-changing oxidation; and b. treating said material thus exposed with an oxidizing agent, whereby said normally oxidizable compound situated in the unexposed portions of said composition, and thus remaining normally oxidizable, is oxidized to yield said distinct color change, thereby providing a visibly distinct image.
Claim 5
Dependent Claim
19 words
The process according to claim 5 wherein said treating step comprises contacting said material with a fluid oxidizing agent.
Claim 6
Dependent Claim
17 words
The process according to claim 6 wherein said oxidizing agent comprises a solution of an oxidizing compound.
Claim 7
Dependent Claim
13 words
The process according to claim 6 wherein said oxidizing agent is a gas.
References Cited (Backward Citations)
GB957192A
Cited
US3490907A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-11-12 | 1977-05-14 | 1977-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-12 | 1981-05-14 | 1981-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-12 | 1985-05-14 | 1985-11-13 | $7700.00 | Window Closed / Lapsed |