US3765901A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spectral sensitization of light-sensitive silver halide emulsions
Assignee: Agfa Gevaert NV
•
Filing: 1971-01-20
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Granted: 1973-10-16
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Expires: 1991-01-20
Abstract
Abstract Novel merocyanine dyes are provided which correspond to the general formula : WHEREIN : Z stands for the atoms necessary to close an oxazole nucleus, R1 stands for an aliphatic or aromatic group, R2 stands for hydrogen, an alkyl group, an aralkyl group, an aryl group or a cycloalkyl group, and EACH OF R3 and R4 stands for alkoxycarbonylalkyl. These merocyanine dyes can be used for the spectral sensitization of light-sensitive silver halide emulsions. They do not enhance the fog and leave practically no residual stain after processing and therefore are particularly suitable for the sensitization of Lippmann-emulsions, emulsions of the lith-type and emulsions used in stabilisation processing.
Inventors
- 👤 J Schellekens
- 👤 T Ghys
- 👤 H Depoorter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:13
CPC Classifications
C; C09; C09B; C09B23/00; C09B23/10; C09B23/105; Y; Y10; Y10S; Y10S430/00; Y10S430/15
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
25 words
A light-sensitive emulsion according to claim 1, wherein said dye is present in an amount of 1 to 1,000 mg per mole of silver halide.
Claim 2
Dependent Claim
27 words
A light-sensitive emulsion according to claim 1, wherein said emulsion is an emulsion of the Lippmann-type having an average silver halide grain-size of less than 0.1 micron.
Claim 3
Dependent Claim
25 words
A light-sensitive emulsion according to claim 1, wherein said emulsion is an emulsion of the lith-type comprising at least 50 mole percent of silver chloride.
Claim 4
Dependent Claim
27 words
A light-sensitive emulsion according to claim 1, wherein said emulsion is a rapidly developable emulsion for stabilization processing comprising at least 90 mole percent of silver chloride.
Claim 5
Dependent Claim
13 words
The light-sensitive silver halide emulsion of claim 1 wherein the benzoxazole is chlorobenzoxazole.
Claim 6
Dependent Claim
13 words
The light-sensitive silver halide emulsion of claim 1 wherein the benzoxazole is methoxybenzoxazole.
Claim 7
Dependent Claim
22 words
The light-sensitive silver halide emulsion of claim 1 wherein R1 is CH2CONHSO2CH3.N(C2H5)3; R2 is H; R3 is CH2COOC2H5; and R4 is CH2COOC2H5.
Claim 8
Dependent Claim
22 words
The light-sensitive silver halide emulsion of claim 1 wherein R1 is C2H5; R2 is H; R3 is CH2COOC2H5; and R4 is CH2COOC2H5.
Claim 9
Dependent Claim
22 words
The light-sensitive silver halide emulsion of claim 1 wherein R1 is (CH2)3OSO3Na; R2 is H; R3 is CH2COOC2H5; and R4 is CH2COOC2H5.
Claim 10
Dependent Claim
22 words
The light-sensitive silver halide emulsion of claim 1 wherein R1 is (CH2)3SO3H.N(C2H5)3; R2 is H; R3 is CH2COOC2H5; and R4 is CH2COOC2H5.
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 |