Two Or More Cyanine Sensitizers Patents (Class 430/574)
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Patent number: 4518689Abstract: An inner latent image type silver halide photographic emulsion which is spectrally sensitized by adding at least one monomethine cyanine dye represented by general formula (II) to a direct positive inner latent image type silver halide photographic emulsion and thereafter adding additionally at least one monomethine cyanine dye represented by general formula (I) to said emulsion ##STR1## (the symbols are as defined in the appended claims). A remarkable increase of spectral sensitivity, an increase of maximum density and a decrease of minimum density can be obtained by this silver halide photographic emulsion.Type: GrantFiled: October 27, 1983Date of Patent: May 21, 1985Assignee: Fuji Photo Film Co., Ltd.Inventors: Yasuhiro Noguchi, Yuji Mihara
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Patent number: 4510235Abstract: A silver halide photographic emulsion containing a particular combination of dyes is described which prevents aggravated fogging of the emulsion under the influence of high temperature or the combination of high temperature and high humidity, and minimizes the degradation of sensitivity of the emulsion thus providing an emulsion of high stability to withstand the adverse effects of aging.Type: GrantFiled: April 26, 1984Date of Patent: April 9, 1985Assignee: Fuji Photo Film Co., Ltd.Inventors: Toshinao Ukai, Masaki Okazaki, Haruo Takei, Ichizo Toya, Sadanobu Syuto
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Patent number: 4469785Abstract: There is disclosed a light-sensitive silver halide color photographic material having a silver halide emulsion layer containing at least one layer of a negative working silver halide on a support, comprising the negative working silver halide comprises at least 80 mole % of silver chloride, and being color sensitized with at least one kind of sensitizing dyes having the local maximum value of spectral sensitivity in the wavelength region from 445 nm to 490 nm and at least one kind of sensitizing dyes having the local maximum value of spectral sensitivity in the wavelength region from 420 nm to less than 445 nm.The photographic material according to this invention exhibits excellent color reproducibility and quick process suitability.Type: GrantFiled: December 10, 1982Date of Patent: September 4, 1984Assignee: Konishiroku Photo Industry Co., Ltd.Inventors: Shigeo Tanaka, Kaoru Onodera, Noboru Fujimori
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Patent number: 4442201Abstract: A method for producing a silver halide photographic light-sensitive material having on a support thereof at least one layer formed of an emulsion containing light-sensitive silver halide particles sensitized by a sensitizing dye comprising the steps of adding a first sensitizing dye to an emulsion containing silver halide particles, during the chemical ripening of the silver halide particles, to sensitize the silver halide particles; adding a second sensitizing dye to the emulsion containing the sensitized silver halide particles, after the chemical ripening of the silver halide particles, to form a coating liquid; and coating a support with the coating liquid to produce a silver halide photographic light-sensitive material.Type: GrantFiled: July 7, 1982Date of Patent: April 10, 1984Assignee: Konishiroku Photo Industry Co., Ltd.Inventors: Syun Takada, Takashi Kadowaki, Mitsuhiro Okumura, Shinichi Nakamura, Masaru Iwagaki
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Patent number: 4387155Abstract: Photosensitive silver halide emulsions containing a green-sensitive dye of the formula ##STR1## wherein R is hydrogen or chlorine. The invention is also directed to the novel sensitizing dyes.Type: GrantFiled: May 26, 1981Date of Patent: June 7, 1983Assignee: Polaroid CorporationInventors: Ruth L. Hill, Roger E. Jerry
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Patent number: 4376817Abstract: Direct-positive photographic material having at least one layer which contains a silver halide emulsion surface-fogged by chemical means or by exposure and a tri-nuclear cyanine dye, which has the formula ##EQU1## in which A.sub.1 is .dbd.CH-- or .dbd.CH--CH.dbd.CH--, Z.sub.1 is a monocyclic or polycyclic heterocyclic radical which is linked by a double bond to the adjacent methine group, Z.sup..sym. is a positively charged radical which is mesomeric to Z.sub.1 and is linked by a single bond to the adjacent methine group, Z.sub.2 --is a nitrogen-heterocyclic radical which has its single positive charge on the nitrogen atom and Z.sub.3 .dbd. is a radical which has no charge on the nitrogen atom and is mesomeric to Z.sub.2, at least one of the radicals Z.sub.Type: GrantFiled: July 27, 1981Date of Patent: March 15, 1983Assignee: Ciba-Geigy AGInventors: Rolf Steiger, Jean F. Reber
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Patent number: 4362813Abstract: A light-sensitive silver halide photographic emulsion characterized by containing a combination of at least one sensitizing dye represented by formula (I) and at least one sensitizing dye represented by formula (II). ##STR1## A silver halide color photographic light-sensitive element comprising a support having thereon at least one light-sensitive emulsion layer comprising a sensitizing dye represented by formula (I) and a sensitizing dye represented by formula (II) is also described.Type: GrantFiled: June 29, 1981Date of Patent: December 7, 1982Assignee: Fuji Photo Film Co., Ltd.Inventors: Yuji Mihara, Tadashi Ikeda, Haruo Takei, Masaki Okazaki, Yasuo Aotsuka
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Patent number: 4355098Abstract: Direct positive photographic elements with improved spectral sensitivity in the green and red portion of the visible spectrum are obtained from emulsions containing a supersensitizing amount of a spectral sensitizing dye (a) having a solution absorption maximum less than 495 nm and the lowest vacant energy band less than -3.7 eV, and a sensitizing amount of a spectral sensitizing dye (b) having a lowest vacant energy band between -3.7 eV and 0.3 eV below the lowest vacant energy band of said spectral sensitizing dye (a) and with the highest occupied energy band between -5.9 eV and 0.3 eV above the highest occupied energy level of dye (a).Type: GrantFiled: February 11, 1981Date of Patent: October 19, 1982Assignee: E. I. Du Pont de Nemours and CompanyInventor: James W. Wheeler
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Patent number: 4326023Abstract: Photographic emulsions are sensitized to the red region of the spectrum with a combination of three sensitizing dyes.Type: GrantFiled: September 15, 1976Date of Patent: April 20, 1982Assignee: Eastman Kodak CompanyInventor: Mary K. DeSeyn
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Patent number: 4311786Abstract: Direct-positive photographic material which has at least one layer which contains a silver halide emulsion surface-fogged by chemical means or by exposure and, as a sensitizer, a trinuclear tetramethinecyanine dye in which all or some of the methine hydrogen atoms have been replaced by fluorine, chlorine, bromine or iodine atoms. The novel trinuclear tetramethinecyanine dyes impart an excellent blue-sensitivity to the photographic materials. Furthermore, high maximum densities and very low minimum densities are achieved.Type: GrantFiled: July 11, 1980Date of Patent: January 19, 1982Assignee: Ciba-Geigy AGInventors: Rolf Steiger, Jean F. Reber
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Patent number: 4308345Abstract: A silver halide photographic emulsion selectively spectrally sensitized, particularly to red light, with a combination of at least one sensitizing dye represented by general formula (I): ##STR1## wherein Z.sup.1 and Z.sup.2 each represents the atoms necessary to form a benzothiazole nucleus or a benzoselenazole nucleus, R.sup.1 and R.sup.2 l each represents an alkyl group or a substituted alkyl group, wherein at least one of R.sup.1 or R.sup.2 should represent a sulfo group-containing substituted alkyl group, a carboxyalkyl group or a hydroxyalkyl group, R.sup.3 represents an alkyl group, X.sub.1 represents an acid anion, and m represents 1 or 2, wherein m equals 1 when the dye forms an intramolecular salt (betaine-like structure); at least one sensitizing dye represented by general formula (II): ##STR2## wherein Z.sup.3 represents a sulfur atom or a selenium atom, Z.sup.Type: GrantFiled: October 8, 1976Date of Patent: December 29, 1981Assignee: Fuji Photo Film Co., Ltd.Inventors: Masanao Hinata, Haruo Takei, Akira Sato, Atsuo Iwamoto, Jun Hayashi
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Patent number: 4307185Abstract: A silver halide photographic emulsion spectrally sensitized with a sensitizing combination of at least one sensitizing dye represented by General formula (I), at least one sensitizing dye represented by General formula (II) and at least one sensitizing dye represented by General formula (III): ##STR1## wherein Z.sup.1 and Z.sup.2 each is the atoms necessary to form a benzothiazole nucleus or a benzoselenazole nucleus, R.sup.1 and R.sup.2 each is an alkyl group or a substituted alkyl group, wherein at least one of R.sup.1 and R.sup.2 is a substituted alkyl group having a sulfo group, R.sup.3 is an alkyl group, X.sub.1 is an acid anion and m is 1 or 2 and when the dye forms an intermolecular salt (betaine like structure), m is 1; ##STR2## wherein Z.sup.3 is a sulfur atom or a selenium atom, Z.sup.4 is the atoms necessary to form a benzothiazole nucleus, a benzoselenazole nucleus, a naphtho[1,2-d]thiazole nucleus or a naphtho[1,2-d]selenazole nucleus, R.sup.4 and R.sup.Type: GrantFiled: September 3, 1976Date of Patent: December 22, 1981Assignee: Fuji Photo Film Co., Ltd.Inventors: Masanao Hinata, Haruo Takei, Akira Sato, Atsuo Iwamoto, Jun Hayashi
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Patent number: 4232118Abstract: A photographic material having a light-sensitive silver halide emulsion layer containing a mixture of monomethinecyanine dyes is disclosed. The mixture is particularly suitable for minimizing fog in the finished product.Type: GrantFiled: March 1, 1979Date of Patent: November 4, 1980Assignee: Konishiroku Photo Industry Co., Ltd.Inventors: Ken Okauchi, Takeo Koitabashi, Noboru Fujimori
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Patent number: 4179296Abstract: A silver halide photographic emulsion containing, in supersensitizing amounts, a combination ofat least one benzimidazolocarbocyanine dye wherein an aralkyl group substituted with an acidic group is connected to at least one nitrogen atom in the imidazole ring, which is represented by the following general formula (I): ##STR1## wherein V.sub.1, V.sub.2, V.sub.3 and V.sub.4, which may be the same or different, each represents a hydrogen atom, a halogen atom, an alkyl group, an alkenyl group, a cycloalkyl group, an acyl group, an acyloxy group, an alkoxycarbonyl group, a carbamoyl group, a sulfamoyl group, a cyano group, a trifluoromethyl group or a hydroxy group; R.sub.1, R.sub.2 and R.sub.3, which may be the same or different, each represents an aliphatic group; A represents a sulfo group of a carboxy group; X.sub.1 represents an acid residue; h represents an integer from 1 to 6; and i represents 0 or 1; andat least one cyanine dye represented by the following general formula (II): ##STR2## wherein Z.sub.Type: GrantFiled: December 15, 1977Date of Patent: December 18, 1979Assignee: Fuji Photo Film Co., Ltd.Inventors: Akira Sato, Atsuo Iwamoto, Takeo Sakai, Haruo Takei
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Patent number: 4173483Abstract: A silver halide photographic material for use in flash exposure of less than 1/10000 second comprising 10.sup.-8 to 5.times.10.sup.-7 moles/moles of silver halide of at least one compound belonging to Group VIII of the Periodic Table and at least one of the sensitizing dyes of the following formulas (I) or (II) and which is capable of sensitizing silver halide at less than 550 nm: ##STR1## wherein R, R.sub.1, R.sub.2, R.sub.3, Q, X.sup.(-), Z, Z.sub.1, Z.sub.2, n, n.sub.1, n.sub.2 and n.sub.3 are as defined in the specification.Type: GrantFiled: May 25, 1976Date of Patent: November 6, 1979Assignee: Konishiroku Photo Industry Co., Ltd.Inventors: Teiji Habu, Tomio Nakajima, Eiichi Sakamoto, Noboru Fujimori, Kiyomitsu Mine