US4229526A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Light-sensitive photographic recording material
Assignee: Agfa Gevaert AG
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Filing: 1979-07-25
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Granted: 1980-10-21
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Expires: 1999-07-25
Abstract
Abstract Pyrimidone or thiopyrimidone benzothiazole monomethine cyanines are valuable spectral sensitizers for sensitizing negative silver halide emulsions in the blue region of the spectrum. In contrast to other known monomethine cyanines they have little or no desensitizing effect in the range of inherent sensitivity.
Inventors
- 👤 Hans Ohlschlager
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:29
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/06; G03C1/08; G03C1/10; G03C1/12; G03C1/14; G03C1/16; C; C09; C09B; C09B23/00; C09B23/02; C09B23/04
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
119 words
Light-sensitive photographic recording material comprising at least one negative silver halide emulsion layer which is spectrally sensitized with a monomethine cyanine dye of the following formula ##STR20## in which R 1 and R 2 which may be the same or different represent each a saturated or unsaturated aliphatic hydrocarbon group; R 3 represents a saturated or unsaturated, substituted or unsubstituted hydrocarbon group; R 4 and R 5 which may be the same or different represent hydrogen or saturated or unsaturated hydrocarbon groups, alkoxy groups or halogen; X represents 0 or S and Anion .sup.⊖ represents any photographically inert anion, and is absent when R 3 contains an acid group in the anionic form so that a betaine is present.
Claim 2
Dependent Claim
119 words
Light-sensitive photographic recording material comprising at least one negative silver halide emulsion layer which is spectrally sensitized with a monomethine cyanine dye of the following formula ##STR20## in which R 1 and R 2 which may be the same or different represent each a saturated or unsaturated aliphatic hydrocarbon group; R 3 represents a saturated or unsaturated, substituted or unsubstituted hydrocarbon group; R 4 and R 5 which may be the same or different represent hydrogen or saturated or unsaturated hydrocarbon groups, alkoxy groups or halogen; X represents 0 or S and Anion .sup.⊖ represents any photographically inert anion, and is absent when R 3 contains an acid group in the anionic form so that a betaine is present.
Claim 3
Dependent Claim
82 words
Material as claimed in claim 1 in which the negative silver halide emulsion is spectrally sensitized with a monomethine cyanine of the formula ##STR21## wherein R 1 and R 2 represent methyl R 3 represents alkyl or sulfoalkyl with 2 to 4 carbon atoms R 4 and R 5 which may be the same or different represent hydrogen, chlorine, methyl or methoxy, X represents S, and Anion.sup.⊖ represents or any photographically inert anion or is absent when R 3 represents sulfo alkyl.
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) | 1983-10-21 | 1984-04-21 | 1984-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-10-21 | 1988-04-21 | 1988-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-10-21 | 1992-04-21 | 1992-10-21 | $7700.00 | Window Closed / Lapsed |