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US4197131A
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Dry silver photo-sensitive compositions
Assignee: 3M Co
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Filing: 1978-11-29
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Granted: 1980-04-08
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Expires: 1998-11-29
Abstract
Abstract Dry silver photo-sensitive compositions comprising an intimate mixture of a substantially light-insensitive silver compound which upon reduction gives a visible change and sufficient of a silver halide to catalyse said reduction to give a visible change in those areas where the silver halide has been exposed to light and when the mixture is heated in the presence of a reducing agent, and as a yellow acutance dye a 1-alkyl-4-nitro-methylene-quinolane, the alkyl substituent containing 1 to 4 carbon atoms.
Inventors
- 👤 Bernard D. Lea
- 👤 Jack E. Reece
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:27
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/494; G03C1/498; G03C1/49836; G03C1/49845; G03C1/49854; Y; Y10; Y10S; Y10S430/00; Y10S430/165
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
77 words
A light-sensitive composition comprising an intimate mixture of a substantially light-sensitive silver compound which upon reduction gives a visible change and sufficient of a silver halide to catalyse said reduction to give a visible change in those areas where the silver halide has been exposed to light and when the mixture is heated in the presence of a reducing agent, and as a yellow acutance dye a 1-alkyl-4-nitromethylene-quinolane, the alkyl substitutent containing 1 to 4 carbon atoms.
Claim 2
Dependent Claim
77 words
A light-sensitive composition comprising an intimate mixture of a substantially light-sensitive silver compound which upon reduction gives a visible change and sufficient of a silver halide to catalyse said reduction to give a visible change in those areas where the silver halide has been exposed to light and when the mixture is heated in the presence of a reducing agent, and as a yellow acutance dye a 1-alkyl-4-nitromethylene-quinolane, the alkyl substitutent containing 1 to 4 carbon atoms.
Claim 3
Dependent Claim
21 words
A light-sensitive composition according to claim 1 wherein said alkyl substituent is selected from the group consisting of methyl and ethyl.
Claim 4
Dependent Claim
103 words
A light-sensitive composition according to claim 1 wherein the 1-alkyl-4-nitromethylene-quinolane has the general formula: ##STR4## in which R 1 represents an alkyl group containing 1 to 4 carbon atoms, each R 2 is independently selected from the group consisting of a hydrogen or halogen atom, an alkyl group containing 1 to 4 carbon atoms, an alkenyl group containing 2 to 4 carbon atoms. --(CH 2 ) n COOH where n is 0, 1, 2 or 3, --NO 2 , --NH 2 or NHCOCH 3 , or two groups R 2 together represent the carbon atoms required to complete a fused on benzene ring.
Claim 5
Dependent Claim
59 words
A light-sensitive composition according to claim 3 wherein R 1 is selected from the group consisting of a methyl or ethyl group, at least one group R 2 represents a hydrogen atom and each other R 2 is independently selected from the group consisting of a hydrogen, chlorine or bromine atom, or a methyl, ethyl, methoxy or ethoxy group.
Claim 6
Dependent Claim
32 words
A light-sensitive composition according to claim 3 in which the acutance dye is present in an amount of from 5×10 -4 to 0.1 mole per kilogram of dry solids in the composition.
Claim 7
Dependent Claim
19 words
A light-sensitive composition as claimed in claim 5 wherein at least two of said R 2 groups are hydrogen.
Claim 8
Dependent Claim
20 words
A light-sensitive composition according to claim 6 wherein R 1 is CH 3 and the third R 2 is H.
Claim 9
Dependent Claim
22 words
A light-sensitive composition according to claim 6 wherein R 1 is CH 3 and the third R 2 is 6--CH 3 O.
Claim 10
Dependent Claim
22 words
A light-sensitive composition according to claim 6 wherein R 1 is CH 3 and the third R 2 is 6--CH 3 .
Claim 11
Dependent Claim
22 words
A light-sensitive composition according to claim 6 wherein R 1 is C 2 H 5 and the third R 2 is H.
Claim 12
Dependent Claim
20 words
A light-sensitive composition according to claim 6 wherein R 1 is CH 3 and the third R 2 is 6--Cl.
Claim 13
Dependent Claim
22 words
A light-sensitive composition according to claim 6 wherein R 1 is C 2 H 5 and the third R 2 is 6--Cl.
Claim 14
Dependent Claim
22 words
A light-sensitive composition according to claim 6 wherein R 1 is CH 3 and the third R 2 is 8--CH 3 O.
Claim 15
Dependent Claim
24 words
A light-sensitive composition according to claim 6 wherein R 1 is C 2 H 5 and the third R 2 is 8--CH 3 O.
Claim 16
Dependent Claim
31 words
A light-sensitive composition according to claim 5 wherein the acutance dye is present in an amount from 2×10 -3 to 3×10 -2 mole per kilogram of dry solids in the composition.
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) | 1983-04-08 | 1983-10-08 | 1984-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-04-08 | 1987-10-08 | 1988-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-04-08 | 1991-10-08 | 1992-04-08 | $7700.00 | Window Closed / Lapsed |