US3776739A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spectrally sensitized silver halide photographic emulsion
Assignee: Fujifilm Holdings Corp
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Filing: 1971-02-16
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Granted: 1973-12-04
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Expires: 1991-02-16
Abstract
Abstract A spectrally sensitized silver halide photographic emulsion containing at least one sensitizing dye represented by the following general formula WHEREIN Z and Z'', each represents the atomic group necessary to complete a benzothiazole nucleus, a benzoselenazole nucleus or a naphthothiazole nucleus, R and R'' each represents an alkyl group, a carboxyalkyl group or a sulfoalkyl group, at least one of said R and R'' being a carboxyalkyl or a sulfoalkyl group, X represents an anion and n is 0 or 1, is disclosed. The emulsion is highly sensitive to red light.
Inventors
- 👤 A Sato
- 👤 T Ikeda
- 👤 Y Nakazawa
- 👤 Y Nakamura
- 👤 H Takei
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 08:16
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/06; G03C1/08; G03C1/10; G03C1/12; G03C1/14; G03C1/18; C; C09; C09B; C09B23/00; C09B23/0008
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
101 words
A silver halide photographic emulsion as claimed in claim 1, wherein Z and Z'' are selected from the atomic groups necessary to complete a benzothiazole, a 5-chlorobenzothiazole, a 5-bromobenzothiazole, a 5-methylbenzothiazole, a 5,6-dimethylbenzothiazole, a 5-phenylbenzothiazole, a 5-methoxybenzothiazole, a 5-ethoxybenzothiazole, a 5-methoxycarbonylbenzothiazole, a 5-hydroxybenzothiazole, a 5-methyl-6-ethoxybenzothiazole, a benzoselenazole, a 5-chlorobenzoselenazole, a 5-methylbenzoselenazole, a 5-methoxybenzoselenazole, a 5-hydroxybenzoselenazole, a 5-methoxycarbonylbenzoselenazole, and a Beta -naphthothiazole nucleus; and wherein R and R'' are selected from the group consisting of an ethyl, an n-propyl, a Beta -carboxyethyl, a Nu -carboxypropyl, a delta -carboxybutyl, a omega -carboxypentyl, a Nu -sulfopropyl, a Nu -sulfobutyl, and a delta -sulfobutyl group.
Claim 2
Dependent Claim
21 words
A silver halide photographic emulsion as claimed in claim 1, wherein said sensitizing dye is selected from the group consisting of
Claim 3
Dependent Claim
35 words
A silver halide photographic emulsion as claimed in claim 1, wherein the amount of the sensitizing dye ranges from 5 to 200 mg of dye per kg of emulsion containing 0.5 mole of silver halide.
Claim 4
Dependent Claim
23 words
A photographic light-sensitive material comprising a support having thereon at least one layer containing the silver halide emulsion as claimed in claim 1.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-03 | 1977-06-04 | 1977-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-03 | 1981-06-04 | 1981-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-03 | 1985-06-04 | 1985-12-04 | $7700.00 | Window Closed / Lapsed |