Patent EP0381392A2 successfully refreshed from Google Patents.
US4288534A
Expired / Lapsed
US
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Photographic silver halide materials containing light-absorbing dyes
Assignee: Agfa Gevaert NV
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Filing: 1980-02-15
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Granted: 1981-09-08
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Expires: 2000-02-15
Abstract
Abstract For absorbing light of the whole visible spectral region in a silver halide emulsion layer or in an antihalation layer of a photographic material it suffices to use a 2-pyrazolin-5-one pentamethine oxonol dye corresponding to the formula: ##STR1## wherein R is a C 1 -C 5 alkyl group. The dyes are used in dispersed form in at least one light-sensitive silver halide emulsion layer or in an antihalation layer.
Inventors
- 👤 Raymond G. Lemahieu
- 👤 Henri Depoorter
- 👤 Emiel A. Hofman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:00
CPC Classifications
C; C09; C09B; C09B23/00; C09B23/02; C09B23/08; C09B23/083; G; G03; G03C; G03C1/00; G03C1/76; G03C1/825; G03C1/83; G03C1/832
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
56 words
A photograhic light-sensitive material comprising a support and at least one light-sensitive silver halide emulsion layer wherein the emulsion layer or an antihalation layer coated on either side of the support comprises in dispersed state therein a 2-pyrazolin-5-one oxonol dye corresponding to the general formula: ##STR6## wherein R represents a C 1 -C 5 alkyl group.
Claim 2
Dependent Claim
56 words
A photograhic light-sensitive material comprising a support and at least one light-sensitive silver halide emulsion layer wherein the emulsion layer or an antihalation layer coated on either side of the support comprises in dispersed state therein a 2-pyrazolin-5-one oxonol dye corresponding to the general formula: ##STR6## wherein R represents a C 1 -C 5 alkyl group.
Claim 3
Dependent Claim
22 words
A material according to claim 1, wherein said dye is present in an antihalation layer between the support and the emulsion layer.
Claim 4
Dependent Claim
18 words
A material according to claim 1, wherein the substituent R of said dye is methyl, ethyl, or tert-butyl.
Claim 5
Dependent Claim
18 words
A material according to claim 2, wherein the substituent R of said dye is methyl, ethyl, or tert-butyl.
Claim 6
Dependent Claim
14 words
A material according to claim 1, wherein the emulsion layer has been sensitized panchromatically.
Claim 7
Dependent Claim
14 words
A material according to claim 2, wherein the emulsion layer has been sensitized panchromatically.
References Cited (Backward Citations)
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Cited
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Cited
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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) | 1984-09-07 | 1985-03-09 | 1985-09-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-09-07 | 1989-03-09 | 1989-09-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-09-07 | 1993-03-09 | 1993-09-08 | $7700.00 | Window Closed / Lapsed |