US3765895A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic print-out composition containing a colorless stable-free radical precursor and a photoactivator
Assignee: Eastman Kodak Co
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Filing: 1971-11-22
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Granted: 1973-10-16
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Expires: 1991-11-22
Abstract
Abstract Photographic compositions including the combination of a substantially colorless stable-free radical precursor and at least one photoactivator which reacts with the free radical precursor upon exposure to activating rays, produce a colored, stable-free radical in the exposed areas directly on exposure. These printout elements can be carried on a support to form photographic printout elements.
Inventors
- 👤 C Fox
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:33
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/72; G03C1/73
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
28 words
A photographic printout composition as described in claim 1 wherein the mole ratio of said stable-free radical precursor to said photoactivator ranges from about 1:0.1 to about 1:500.
Claim 2
Dependent Claim
16 words
A photographic printout composition as described in claim 1 and further comprising a film-forming polymeric binder.
Claim 3
Dependent Claim
17 words
A photographic element comprising a support having thereon a photographic printout composition as described in claim 1.
Claim 4
Dependent Claim
24 words
A photographic element as described in claim 4 wherein said support is porous and said photographic printout composition is imbibed into the pores thereof.
Claim 5
Dependent Claim
53 words
A photographic element comprising a support having thereon a photographic printout composition containing a 2-amino-phenyl-1, 3-dihydroxy tetrahydroimidazole stable free radical precursor and a photoactivator selected from the group consisting of a 4-dialkylaminobenzene diazonium salt, a 2,2''-azobis (2-methylpropionitrile), a 2-(p-chlorophenyl)-4,5-diphenylbiimidazole and a N,N''-bis(4-diphenylaminobenzylidene) hydrazine, sAid stable free radical precursor having the following generic formula:
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) | 1976-10-15 | 1977-04-16 | 1977-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-15 | 1981-04-16 | 1981-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-15 | 1985-04-16 | 1985-10-16 | $7700.00 | Window Closed / Lapsed |