US3984246A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Antihalation and filter dyes for photographic materials
Assignee: Agfa Gevaert AG
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Filing: 1975-11-04
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Granted: 1976-10-05
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Expires: 1995-11-04
Abstract
Abstract Photographic materials containing in at least one photographic layer as antihalation- or filter-dyes mono-, tri- or pentamethineoxonoles of 1-sulfolanyl pyrazolones, which dyes can be easily decolorized and washed out on treatment of the photographic material in photographic processing.
Inventors
- 👤 Hans Ohlschlager
- 👤 Oskar Riester
- 👤 Franz Moll
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:06
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/76; G03C1/825; G03C1/83; G03C1/832; Y; Y10; Y10S; Y10S430/00; Y10S430/131
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
43 words
A photographic material comprising at least one light-sensitive silver halide emulsion layer and containing at least one photographic layer coloured by a monomethine, trimethine or pentamethine oxonol dye, wherein the improvement dye is at least one monomethine, trimethine or pentamethine oxonol of 1-sulpholanyl-pyrazolone.
Claim 2
Dependent Claim
43 words
A photographic material comprising at least one light-sensitive silver halide emulsion layer and containing at least one photographic layer coloured by a monomethine, trimethine or pentamethine oxonol dye, wherein the improvement dye is at least one monomethine, trimethine or pentamethine oxonol of 1-sulpholanyl-pyrazolone.
Claim 3
Dependent Claim
119 words
A light-sensitive material according to claim 1, wherein the dye is a compound of the following formula: ##STR7## wherein R 1 and R denote identical or different alkyl or aryl groups or the groups COOR 5 or CONR 6 R 7 ; R 2 , r 3 and R 4 are identical or different and denote hydrogen, a lower alkyl group or an aryl group; R 5 , r 6 and R 7 are identical or different and denote hydrogen, alkyl or aryl or R 6 and R 7 together denote the ring members required to complete a heterocyclic ring; R 8 denotes hydrogen, or a cation capable of forming a watersoluble salt and n = 0,1 or 2.
Claim 4
Dependent Claim
14 words
A light-sensitive material according to claim 2, wherein R 1 and R are identical.
Claim 5
Dependent Claim
18 words
A light-sensitive material according to claim 2 wherein R 2 , R 3 and R 4 denote hydrogen.
Claim 6
Dependent Claim
86 words
A light-sensitive material according to claim 2 wherein R 1 and/or R denotes the group COOR 5 or the group CONR 6 R 7 are identical or different and denote hydrogen or a group selected of an alkyl group with from 1 to 18 C-atoms, and a phenyl group which may be substituted, and R 6 and R 7 may further together denote the ring members required to complete a heterocyclic ring selected of pyrrolidine, piperidine, cyclohexamethyleneimine, indoline, tetrahydroquinoline, morpholine, thiomorpholine, piperazine and n-methyl piperazine rings.
References Cited (Backward Citations)
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US3647460A
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US3726682A
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US3795519A
Cited
US3865817A
Cited
US3932188A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-10-05 | 1980-04-05 | 1980-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-10-05 | 1984-04-05 | 1984-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-10-05 | 1988-04-05 | 1988-10-05 | $7700.00 | Window Closed / Lapsed |