Patents by Inventor Yoichi Suga
Yoichi Suga has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 7153639Abstract: Disclosed is a silver halide color photographic lightsensitive material comprising a support and, superimposed thereon, a blue-sensitive layer unit, a green-sensitive layer unit and a red-sensitive layer unit, each of these layers comprising at least two silver halide emulsion layers with different photographic speeds, together with at least one antihalation layer, wherein couplers capable of color formation are contained in a total coating amount of 0.02 mmol/m2 to 2 mmol/m2.Type: GrantFiled: December 5, 2002Date of Patent: December 26, 2006Assignee: Fuji Photo Film Co., Ltd.Inventors: Hiroshi Tamaoki, Yoichi Suga, Yoshio Ishii, Mitsuhiro Uchida
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Patent number: 6783923Abstract: A silver halide color photosensitive material comprising at least one red-sensitive silver halide emulsion layer, at least one green-sensitive silver halide emulsion layer and at least one blue-sensitive silver halide emulsion layer, on a support. The photosensitive material has an indicated speed of 800 or higher, and an ISO speed of 1.25 times the indicated speed or higher.Type: GrantFiled: July 16, 2003Date of Patent: August 31, 2004Assignee: Fuji Photo Film Co., Ltd.Inventors: Takeichi Tatsuta, Yoichi Suga, Kohzaburoh Yamada
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Publication number: 20040161713Abstract: Disclosed is a silver halide color photographic lightsensitive material comprising a support and, superimposed thereon, a blue-sensitive layer unit, a green-sensitive layer unit and a red-sensitive layer unit, each of these layers comprising at least two silver halide emulsion layers with different photographic speeds, together with at least one antihalation layer, wherein couplers capable of color formation are contained in a total coating amount of 0.02 mmol/m2 to 2 mmol/m2.Type: ApplicationFiled: August 19, 2003Publication date: August 19, 2004Inventors: Hiroshi Tamaoki, Yoichi Suga, Yoshio Ishii, Mitsuhiro Uchida
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Publication number: 20040018454Abstract: A silver halide color photosensitive material comprising at least one red-sensitive silver halide emulsion layer, at least one green-sensitive silver halide emulsion layer and at least one blue-sensitive silver halide emulsion layer, on a support. The photosensitive material has an indicated speed of 800 or higher, and an ISO speed of 1.25 times the indicated speed or higher.Type: ApplicationFiled: July 16, 2003Publication date: January 29, 2004Inventors: Takeichi Tatsuta, Yoichi Suga, Kohzaburoh Yamada
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Patent number: 6641987Abstract: Disclosed is a silver halide color photographic light-sensitive material including at least one red-sensitive silver halide emulsion layer, at least one green-sensitive silver halide emulsion layer, and at least one blue-sensitive silver halide emulsion layer on a support, and having an ISO sensitivity of 640 or more, wherein the material exhibits a color saturation evaluation value &eegr;, represented by equation (I) below, of −15 dB or more. &eegr;=10 log(1/VT) [VT=(⅙)×((62−Y1)2+(62−Y2)2+(62−Y3)2+(62−Y4)2+(62−Y5)2+(62−Y6)2)] (I) In Formula (I), each of Y1 to Y6 is a value obtained by exposing 12 colors of a Macbeth color chart with six exposure amounts, from −1 under to +4 over, measuring the saturation of each resultant color, and averaging the data (chroma values) for a corresponding exposure amount.Type: GrantFiled: March 29, 2001Date of Patent: November 4, 2003Assignee: Fuji Photo Film Co., Ltd.Inventors: Yoichi Suga, Hideto Ikoma, Jun Okamoto
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Patent number: 6461803Abstract: A silver halide color photographic lightsensitive material comprising at least one red-sensitive silver halide emulsion layer, at least one green-sensitive silver halide emulsion layer and at least one blue-sensitive silver halide emulsion layer on a support, wherein the lightsensitive material has an ISO speed of 640 or more, and has a variation, in terms of a SNGR ratio, of magenta and cyan colors of 0 dB or more when the lightsensitive material is subjected to each of white light exposure, white fluorescent lamp exposure and three band fluorescent lamp exposure.Type: GrantFiled: September 6, 2000Date of Patent: October 8, 2002Assignee: Fuji Photo Film Co., Ltd.Inventors: Yoichi Suga, Takanori Hioki, Jun Okamoto
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Publication number: 20020042030Abstract: Disclosed is a silver halide color photographic light-sensitive material including at least one red-sensitive silver halide emulsion layer, at least one green-sensitive silver halide emulsion layer, and at least one blue-sensitive silver halide emulsion layer on a support, and having an ISO sensitivity of 640 or more, wherein the material exhibits a color saturation evaluation value &eegr;, represented by equation (I) below, of −15 dB or more.Type: ApplicationFiled: March 29, 2001Publication date: April 11, 2002Inventors: Yoichi Suga, Hideto Ikoma, Jun Okamoto
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Patent number: 6010842Abstract: A silver halide photographic light-sensitive material has at least one light-sensitive silver halide emulsion layer on a support, wherein a light-sensitive silver halide emulsion in the emulsion layer contains a compound represented by formula (I) below and a compound represented by formula (II) below. ##STR1## In formula (I), each of R.sub.1 to R.sub.3 represents a hydrogen atom, an alkyl group, or an aryl group. ##STR2## In formula (II), R represents a specific alkyl group, each of L.sub.1 and L.sub.2 represents a methine group, p.sub.1 represents 0 or 1, Z.sub.1 represents atoms required to form a 5- or 6-membered nitrogen-containing heterocyclic ring, M.sub.1 represents a charge-balancing counter ion, m.sub.1 represents a number from 0 to 10 required to neutralize electric charge of a molecule, and Q represents a methine group or a polymethine group substituted by a heterocyclic group or an aromatic group.Type: GrantFiled: August 29, 1997Date of Patent: January 4, 2000Assignee: Fuji Photo Film Co., Ltd.Inventors: Yoichi Suga, Masato Taniguchi
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Patent number: 5643711Abstract: A silver halide photographic light-sensitive material having at least one light-sensitive silver halide emulsion layer on a support is disclosed. The light-sensitive silver halide emulsion layer contains tabular silver halide grains having an average aspect ratio of 2 or more and contains a compound represented by the following formula (I) and/or the oxidized product thereof:X.sub.1 --A--X.sub.2 Formula (I)wherein X.sub.1 and X.sub.2 each represent OR.sub.1 or ##STR1## wherein R.sub.1 represents a hydrogen atom or a group capable of being converted to a hydrogen atom upon hydrolysis, and R.sub.2 and R.sub.3 each represent hydrogen, alkyl, aryl, heterocyclic, heterocyclic sulfonyl, heterocyclic carbonyl, sulfamoyl, or carbamoyl, A represents arylene, and at least one of the groups representative of X.sub.1, X.sub.2, and A is substituted by a group which accelerates adsorption to a silver halide grain.Type: GrantFiled: January 10, 1994Date of Patent: July 1, 1997Assignee: Fuji Photo Film Co., Ltd.Inventors: Shunji Takada, Yoichi Suga, Hiroyuki Kawamoto
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Patent number: 5556741Abstract: There is disclosed a silver halide photosensitive material having at least one silver halide emulsion layer coated on a support, wherein silver halide grains in the emulsion layer are subjected to reduction sensitization and contain a radical scavenger, prior to the completion of a chemical sensitization. There is also disclosed a silver halide emulsion and a method of manufacturing the same. The said silver halide photosensitive material has a enhanced sensitivity, without causing high fog.Type: GrantFiled: June 7, 1995Date of Patent: September 17, 1996Assignee: Fuji Photo Film Co., Ltd.Inventors: Yoichi Suga, Yoshio Ishii, Masakazu Morigaki
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Patent number: 5550012Abstract: A silver halide emulsion contains silver halide grains in a dispersion medium. Tabular silver halide grains having a thickness of less than 0.5 .mu.m, a diameter of 0.3 .mu.m or more, an aspect ratio of 2 or more, and 10 or more dislocations per grain account for 50% or more of a projected area of all the silver halide grains. The grains are formed in the presence of at least one compound which can oxidize silver atoms.Type: GrantFiled: August 22, 1994Date of Patent: August 27, 1996Assignee: Fuji Photo Film Co., Ltd.Inventor: Yoichi Suga
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Patent number: 5538838Abstract: The present invention provides a silver halide color photographic material having an excellent color reproducibility and preservability.Type: GrantFiled: December 7, 1994Date of Patent: July 23, 1996Assignee: Fuji Photo Film Co., Ltd.Inventors: Yoichi Suga, Junji Nishigaki
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Patent number: 5476758Abstract: Disclosed herein is a silver halide color photographic light-sensitive material which has a specific photographic sensitivity of 320 or more, and which comprises a support layer and silver halide emulsion layers formed thereon. The material has a film thickness of 22 .mu.m or less, measured from the light-sensitive layer closest to the support layer up to the surface of the material facing away from the support layer. At least one of the silver halide emulsion layers contains a spectral sensitizer represented by the following formula (I): ##STR1## In the formula, R.sup.1 and R.sup.2 are alkyl groups, at least one of which at least one carbon atom bonds together with at least three atoms other than hydrogen atoms, X is an anion, p is 0 or 1, k is 0, 1 or 2, L.sub.1 and L.sub.2 are a methyne group or a substituted methyne group, Z.sup.1 and Z.sup.2 are groups of atoms numerous enough to form a 5- or 6-membered nitrogen-containing heterocyclic ring.Type: GrantFiled: June 6, 1994Date of Patent: December 19, 1995Assignee: Fuji Photo Film Co., Ltd.Inventors: Yoichi Suga, Masaki Okazaki
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Patent number: 5436121Abstract: Disclosed is a silver halide color photographic light-sensitive material which includes, on a support, at least one blue-sensitive silver halide emulsion layer containing a yellow coupler, at least one green-sensitive silver halide emulsion layer containing a magenta coupler, and at least one red-sensitive silver halide emulsion layer containing a cyan coupler, and in which a weight-averaged wavelength (.lambda..sub.-R) of a spectral sensitivity distribution of magnitude of an interimage effect which the silver halide emulsion layers except for all of the red-sensitive silver halide emulsion layers have on the red-sensitive layers over a range of 500 to 600 nm is 500 nm<.lambda..sub.-R <560 nm, and a difference between weight-averaged wavelength (.lambda..sub.G) of a spectral sensitivity distribution of at least one green-sensitive silver halide emulsion layer and .lambda..sub.-R is .lambda..sub.G -.lambda..sub.-R .ltoreq.Type: GrantFiled: November 22, 1994Date of Patent: July 25, 1995Assignee: Fuji Photo Film Co., Ltd.Inventors: Yoichi Suga, Junji Nishigaki, Takanori Hioki
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Patent number: 5418124Abstract: A silver halide photographic emulsion, in which silver halide grains have been formed while iodide ions are rapidly being generated in a reactor vessel to form a silver iodide-containing region in the silver halide grains, and the silver halide grains have been spectrally sensitized by a sensitizing dye represented by the following formula (I): ##STR1## wherein Z.sub.1 and Z.sub.2.sup.- represent non-metallic atom group which form a 5- or 6-membered heterocyclic ring having nitrogen atom and carbon atom in the ring, R.sub.3 and R.sub.4 represent alkyl groups, X.sub.1.sup.- represents an anion, and p represents 1 or 2.Type: GrantFiled: March 19, 1993Date of Patent: May 23, 1995Assignee: Fuji Photo Film Co. Ltd.Inventors: Yoichi Suga, Makoto Kikuchi, Morio Yagihara, Hisashi Okamura, Hiroshi Kawamoto
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Patent number: 5397692Abstract: A silver halide photographic light-sensitive material comprises, on a support, at least one negative silver halide emulsion layer containing silver halide grains which are subjected to selenium sensitization, have at least one peak value in internal sensitivity speck numbers in a distribution of sensitivity specks, the peak value being present at a depth of 2 nm to less than 50 nm from the surface of the grains, and have an average aspect ratio of less than 8.Type: GrantFiled: May 25, 1993Date of Patent: March 14, 1995Assignee: Fuji Photo Film Co., Ltd.Inventor: Yoichi Suga
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Patent number: 5057409Abstract: A silver halide photographic material comprising a support having thereon at least one silver halide emulsion layer, wherein the silver halide emulsion layer comprises a silver halide emulsion which satisfies condition (i) and wherein the silver halide emulsion layer or another silver halide emulsion layer having the same color sensitivity as that of the silver halide emulsion layer comprises a silver halide emulsion which satisfies condition (ii):Condition (i): tabular grains having at least two twinning planes, a diameter of at least 0.15 .mu.m and an average aspect ratio of at least 2 account for at least 70% of silver halide grains as calculated in terms of projected area and grains having a (b/a) ratio of at least 5 wherein (a) is the longest distance between the two or more parallel twinning planes and (b) is the grain thickness account for at least 50% of the tabular grains by number;Condition (ii): grains having a diameter of at least 0.15 .mu.Type: GrantFiled: October 31, 1988Date of Patent: October 15, 1991Assignee: Fuji Photo Film Co., Ltd.Inventor: Yoichi Suga
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Patent number: 5043258Abstract: A silver halide photographic emulsion is described which has excellent color-sensitizing efficiency by sensitizing dyes, sharpness, covering power, and pressure resistant properties, wherein the grains are comprised of core/shell type grains having contained therein a partially halogen-converted silver salt phase, the silver salt comprising silver halochloride, silver thiocyanate or silver citrate.Type: GrantFiled: June 12, 1990Date of Patent: August 27, 1991Assignee: Fuji Photo Film Co.Inventors: Mikio Ihama, Yuji Kume, Koji Tamoto, Hiroshi Takehara, Hiroshi Ayato, Yoichi Suga, Seiichiro Kishida
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Patent number: 4977074Abstract: A silver halide emulsion comprising a binder and silver halide grains, wherein the projected area of substantially circular tabular silver halide grains having two parallel twin planes to the basal planes having a linear ratio of 0 to 4/5 accounts for from 70% to 100% of the projected area of the whole silver halide grains, and further the circular tabular silver halide grains are monodisperse grains.The emulsion has good aging stability.Type: GrantFiled: August 17, 1988Date of Patent: December 11, 1990Assignee: Fuji Photo Film Co., Ltd.Inventors: Mitsuo Saitou, Yoichi Suga
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Patent number: 4853322Abstract: A light-sensitive silver halide emulsion is disclosed, which comprises light-sensitive silver halide grains in a binder, wherein tabular grains having a diameter of at least 0.15 .mu.m account for at least 70% of the total projected area of said silver halide grains, said tubular grains have a mean aspect ratio of not more than 8.0, and at least 50% (by number) of all of said tabular grains are tabular grains in which the ratio (b/a) of the thickness (b) of said tabular grain to the longest spacing (a) between two or more parallel twinning planes of said tabular grain is at least 5. A color photographic material using the light-sensitive silver halide emulsion for at least one of the silver halide emulsion layers other than the outermost silver halide emulsion layer is also disclosed.Type: GrantFiled: December 28, 1987Date of Patent: August 1, 1989Assignee: Fuji Photo Film Co., Ltd.Inventors: Katsumi Makino, Yuichi Ohashi, Hiroshi Takehara, Yoichi Suga, Takekimi Shiozawa