Patents by Inventor Kohzaburoh Yamada
Kohzaburoh Yamada 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: 6297000Abstract: A thermographic recording element having at least one image forming layer contains an organic silver salt, a reducing agent, and an adsorption promoting group-bearing alkene compound. The element has high Dmax, high sensitivity, satisfactory contrast and shelf stability.Type: GrantFiled: April 28, 2000Date of Patent: October 2, 2001Assignee: Fuji Photo Film Co., Ltd.Inventors: Hiroyuki Suzuki, Toshihide Ezoe, Kohzaburoh Yamada
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Patent number: 6277553Abstract: A thermographic recording element having at least one image forming layer contains an organic silver salt, a reducing agent, and a nucleating agent. The element has high Dmax, high sensitivity, satisfactory contrast and minimized black pepper.Type: GrantFiled: October 16, 1998Date of Patent: August 21, 2001Assignee: Fuji Photo Film Co., Ltd.Inventors: Masahiko Taniguchi, Kohzaburoh Yamada, Toshihide Ezoe
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Patent number: 6277554Abstract: In a thermographic recording element comprising an organic silver salt, a photosensitive silver halide, and a reducing agent, there are further included a specific compound and a hydrazine derivative. The element exhibits a high contrast and the minimized dependency of photographic properties on developing temperature.Type: GrantFiled: May 11, 1999Date of Patent: August 21, 2001Assignee: Fuji Photo Film, Co., Ltd.Inventors: Kohzaburoh Yamada, Hiroyuki Suzuki, Toshihide Ezoe
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Patent number: 6232059Abstract: A thermographic recording element having an image forming layer contains an organic silver salt, a reducing agent, an optional photosensitive silver halide, and a specific nucleating agent. The element has high Dmax, high sensitivity, satisfactory contrast, low fog, and minimal dependency of photographic properties on developing temperature.Type: GrantFiled: December 1, 1998Date of Patent: May 15, 2001Assignee: Fuji Photo Film Co., Ltd.Inventors: Kohzaburoh Yamada, Hiroyuki Suzuki, Takashi Hoshimiya, Hirotomo Sasaki, Kohji Kawato, Toshihide Ezoe
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Patent number: 6177240Abstract: A thermographic recording element having an image forming layer contains an organic silver salt, a reducing agent, an optional photosensitive silver halide, and a specific nucleating agent. The element has high Dmax, high sensitivity, satisfactory contrast, and minimal dependency of photographic properties on developing conditions.Type: GrantFiled: November 17, 1998Date of Patent: January 23, 2001Assignee: Fuji Photo Film Co., Ltd.Inventors: Kohzaburoh Yamada, Hiroyuki Suzuki, Toshihide Ezoe
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Patent number: 6090538Abstract: A heat developable light-sensitive material comprising an organic acid silver and silver halide, which contains a compound represented by the following formula (A) and a hydrazine derivative: ##STR1## wherein R represents a hydrogen atom or an alkyl group having from 1 to 10 carbon atoms and R' and R" each represents an alkyl group having from 1 to 5 carbon atoms.Type: GrantFiled: August 15, 1996Date of Patent: July 18, 2000Assignee: Fuji Photo Film Co., Ltd.Inventors: Tsutomu Arai, Toshiaki Kubo, Minoru Sakai, Kohzaburoh Yamada, Kazunobu Katoh
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Patent number: 6087086Abstract: A thermographic recording element having at least one image forming layer contains an organic silver salt, a reducing agent, and a ballast group-bearing alkene compound. The element has high Dmax, high sensitivity, satisfactory contrast and minimized black pepper.Type: GrantFiled: September 30, 1998Date of Patent: July 11, 2000Assignee: Fuji Photo Film Co., Ltd.Inventors: Hiroyuki Suzuki, Toshihide Ezoe, Kohzaburoh Yamada
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Patent number: 6074799Abstract: A silver halide photographic material comprising a support having thereon at least one photosensitive silver halide emulsion layer, wherein at least one of the silver halide emulsion layer and other hydrophilic colloid layers comprises at least one hydrazine compound represented by the following general formula (II) in the form of fine solid dispersion:A--(B).sub.m (II)wherein A represents a connecting group; B represents a group represented by the following general formula (III); and m represents an integer of from 2 to 6:--(L.sub.2 --Ar.sub.2).sub.n --L.sub.1 --Ar.sub.1 --NHNH--G.sub.1 --R.sub.1(III)wherein Ar.sub.1 and Ar.sub.2 each represents an aromatic group or an aromatic heterocyclic group; L.sub.1 and L.sub.2 each represents a connecting group; n represents an integer of 0 or 1; R.sub.1 represents a hydrogen atom, an alkyl group, an aryl group, a heterocyclic group, an alkoxy group, an aryloxy group, an amino group or a hydrazino group; and G.sub.1 represents a --CO-- group, an --SO.sub.Type: GrantFiled: October 23, 1998Date of Patent: June 13, 2000Assignee: Fuji Photo Film Co., Ltd.Inventors: Toshihide Ezoe, Kohzaburoh Yamada
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Patent number: 6048675Abstract: A development processing method comprising a step of developing a silver halide photographic material having at least one silver halide emulsion layer with a developing solution containing a hydroquinone developing agent, wherein said developing solution has a pH of from 9.0 to 11.0, and contains a compound represented by formula (I) and a compound represented by formula (II) in a concentration ratio of the compound represented by formula (II)/the hydroquinone developing agent of from 0.03 to 0.12: ##STR1## wherein the symbols in these formulae are defined in the specification.Type: GrantFiled: November 26, 1997Date of Patent: April 11, 2000Assignee: Fuji Photo Film Co., Ltd.Inventors: Mitsunori Hirano, Kohzaburoh Yamada
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Patent number: 6017674Abstract: A silver halide photographic material comprising a support having thereon at least one photosensitive silver halide emulsion layer, wherein at least one of the silver halide emulsion layer and other hydrophilic colloid layers comprises at least one hydrazine compound represented by the following general formula (II) in the form of fine solid dispersion:A--(B).sub.m (II)wherein A represents a connecting group; B represents a group represented by the following general formula (III); and m represents an integer of from 2 to 6:--(L.sub.2 --Ar.sub.2).sub.n --L.sub.1 --Ar.sub.1 --NHNH--G.sub.1 --R.sub.1(III)wherein Ar.sub.1 and Ar.sub.2 each represents an aromatic group or an aromatic heterocyclic group; L.sub.1 and L.sub.2 each represents a connecting group; n represents an integer of 0 or 1; R.sub.1 represents a hydrogen atom, an alkyl group, an aryl group, a heterocyclic group, an alkoxy group, an aryloxy group, an amino group or a hydrazino group; and G.sub.1 represents a --CO-- group, an --SO.sub.Type: GrantFiled: January 21, 1997Date of Patent: January 25, 2000Assignee: Fuji Photo Film Co., Ltd.Inventors: Toshihide Ezoe, Kohzaburoh Yamada
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Patent number: 5994040Abstract: A processing composition for silver halide photographic light-sensitive material, which comprises at least one compound represented by the following formula (A), (A-I) or (A-II) and at least one compound represented by the following formula (B): ##STR1## Also disclosed are a developer prepared from the processing composition, and a processing method using the developer.Type: GrantFiled: March 4, 1997Date of Patent: November 30, 1999Assignee: Fuji Photo Film Co., Ltd.Inventors: Shinnichi Morishima, Kohzaburoh Yamada, Seiji Yamashita, Minoru Sakai, Kouta Fukui, Eiichi Okutsu
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Patent number: 5981138Abstract: A hydrazine compound represented by the following formula (I):Ar.sub.1 --NH--NH--G.sub.1 --R.sub.1 (I)wherein Ar.sub.1 represents an aromatic group; G.sub.1 represents a carbonyl group, a sulfonyl group, a sulfoxy group, a phosphoryl group, an oxalyl group or an iminomethylene group; R.sub.1 represents a hydrogen atom or a block group; and at least one of Ar.sub.1 and R.sub.1 has a group represented by the following formula (II): ##STR1## wherein * represents a bond for connecting directly or through a liking group to Ar.sub.1 or R.sub.1 ; Z represents a nonmetallic atom group capable of forming a 5- or 6-membered unsaturated heterocyclic ring having a conjugated positive charge; and X.sup.- represents --O.sup.-, --S.sup.- or --N.sup.- --R.sub.2, wherein R.sub.2 represents an alkyl group, an alkenyl group, an alkynyl group, an aryl group or a heterocyclic group. Also disclosed is a silver halide photographic light-sensitive material containing the hydrazine compound.Type: GrantFiled: September 4, 1997Date of Patent: November 9, 1999Assignee: Fuji Photo Film Co., Ltd.Inventors: Hiroyuki Suzuki, Kohzaburoh Yamada, Hiroshi Takeuchi, Toshihide Ezoe, Takashi Hoshimiya
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Patent number: 5976758Abstract: A development processing method which comprises the steps of: imagewise exposing a silver halide photographic light-sensitive material; and developing the exposed photographic material with a developing solution, wherein the silver halide photographic material comprises a support having thereon at least one light-sensitive silver halide emulsion layer, at least one of the silver halide emulsion layer and other hydrophilic colloidal layers containing at least one hydrazine derivative; and wherein the developing solution is substantially free from a dihydroxybenzene compound, has a pH of from 9.0 to 10.5 and contains (1) at least one ascorbic acid developing agent, (2) at least one 1-phenyl-3-pyrazolidone auxiliary developing agent and (3) a compound represented by the following formula (I): ##STR1## wherein R.sub.1 to R.sub.Type: GrantFiled: December 19, 1997Date of Patent: November 2, 1999Assignee: Fuji Photo Film Co., Ltd.Inventors: Kouta Fukui, Senzo Sasaoka, Kohzaburoh Yamada
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Patent number: 5972580Abstract: A development processing method comprises: exposing a silver halide light-sensitive material comprising a support having thereon at least one light-sensitive silver halide emulsion layer; and developing said exposed light-sensitive material with a developing solution, wherein at least one of said silver halide emulsion layer and other hydrophilic colloidal layers contains at least one hydrazine derivative, and wherein said developing solution is substantially free from a dihydroxybenzene compound, has a pH of from 9.0 to 10.5, and contains (1) at least one ascorbic acid derivative developing agent, (2) at least one aminophenol auxiliary developing agent and (3) a specific mercaptopyrimidine compound. The processing method provides a high-contrast image required in the field of graphic arts using a developing solution having no problem with respect to the ecosystem and working environment, without causing silver stain even at a low replenishment rate.Type: GrantFiled: November 21, 1997Date of Patent: October 26, 1999Assignee: Fuji Photo Film Co., Ltd.Inventors: Kouta Fukui, Kohzaburoh Yamada
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Patent number: 5962212Abstract: A thermographic recording element comprising an organic acid silver salt, a reducing agent, a specific hydrazine derivative, and optionally, a photosensitive silver halide is improved in storage stability and forms images having high Dmax.Type: GrantFiled: June 3, 1998Date of Patent: October 5, 1999Assignee: Fuji Photo Film Co., Ltd.Inventors: Hiroyuki Suzuki, Toshiaki Kubo, Kohzaburoh Yamada
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Patent number: 5888694Abstract: A silver halide photographic material is described, which comprises a compound represented by the following formula (I) or (II):A.paren open-st.(L).sub.m --B).sub.n (I)(A--(L).sub.m .paren close-st..sub.n B (II)wherein A represents an adsorption accelerating group to silver halide or a precursor thereof; B represents a quaternised nitrogen-containing heterocyclic ring and a counter ion thereof; L represents a linking group; m represents 0 or 1; and n represents an integer of from 1 to 4. An image formation method is also described, which comprises the steps of exposing the above-described silver halide photographic material and developing the exposed material with a specific developer.Type: GrantFiled: February 18, 1997Date of Patent: March 30, 1999Assignee: Fuji Photo Film Co., Ltd.Inventors: Kohzaburoh Yamada, Toshiaki Kubo
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Patent number: 5882841Abstract: A silver halide photographic light-sensitive material comprising a support having thereon at least one light-sensitive silver halide emulsion layer, wherein at least one of the silver halide emulsion layer and other hydrophilic colloid layers comprises fine polymer particles containing at least one hydrazine compound represented by the following general formula (NB):A--(B).sub.m (NB)wherein A represents a connecting group; m represents an integer of from 2 to 6; and B represents a group containing a hydrazine structure. The sliver halide photographic light-sensitive material exhibits an ultrahigh contrast, an excellent storage stability and an excellent processing stability and is prevented from the occurrence of processing unevenness. A method for processing the silver halide photographic light-sensitive material is also disclosed.Type: GrantFiled: December 24, 1997Date of Patent: March 16, 1999Assignee: Fuji Photo Film Co., Ltd.Inventors: Toshihide Ezoe, Kouta Fukui, Kohzaburoh Yamada
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Patent number: 5858610Abstract: An image forming method comprising developing a silver halide photographic light-sensitive material which comprises a support having thereon at least one light-sensitive silver halide emulsion layer: wherein the silver halide photographic light-sensitive material contains at least one kind of hydrazine derivative represented by general formula (NB) in at least one layer of the silver halide emulsion layer(s) and other hydrophilic colloidal layers:A--(B).sub.m (NB)and wherein the development is conducted by using a developing solution having a pH of from not less than 8.5 to less than 11.0, which developing solution does not substantially contain a dihydroxybenzene developing agent, but contains a developing agent represented by general formula (1): ##STR1## The symbols used in the above formulas are defined in the specification.Type: GrantFiled: April 17, 1997Date of Patent: January 12, 1999Assignee: Fuji Photo Film Co., Ltd.Inventors: Toshihide Ezoe, Kohzaburoh Yamada
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Patent number: 5840472Abstract: A developer for a silver halide photographic photosensitive material containing at least one of monocyclic dimercaptotriazine compounds, bis-type dimercaptotriazine compounds, mercapto-1,2,4-triazine compounds and dimercaptopyrimidine compounds, and a process for developing a silver halide photographic photosensitive material using the developer. The compounds of the present invention provides excellent effect in preventing silver stains without affecting the photographic properties of the photographic material.Type: GrantFiled: February 7, 1997Date of Patent: November 24, 1998Assignee: Fuji Photo Film Co., Ltd.Inventors: Hirotomo Sasaki, Harumi Watanabe, Kohzaburoh Yamada
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Patent number: 5789139Abstract: A hydrazide compound represented by the following formula (I), and a silver halide photographic photonsensitive material comprising the hydrazide compound:A--(B).sub.b (I)wherein A represents a heterocyclic group, a condensed polycyclic aromatic group or a group formed by connecting at least two aromatic groups to each other, B represents a group represented by the following formula (I-B) or (II-B), and b represents an integer from 2 to 6;--L.sub.1 --Ar.sub.1 --NHNH--G.sub.1 --R.sub.1 (I-B)--L.sub.3 --Ar.sub.3 --L.sub.2 --Ar.sub.2 --NHNH --G.sub.2 --R.sub.2(II-B)wherein each of G.sub.1 and G.sub.2 represents a carbonyl group, an oxalyl group, a sulfonyl group or a phosphoryl group; each of R.sub.1 and R.sub.2 represents a hydrogen atom or a blocking group; each of Ar.sub.1, Ar.sub.2 and Ar.sub.3 represents an aromatic group or an aromatic heterocyclic group; and each of L.sub.1, L.sub.2 and L.sub.3 represents a linkage group.Type: GrantFiled: December 27, 1996Date of Patent: August 4, 1998Assignee: Fuji Photo Film Co., Ltd.Inventors: Kohzaburoh Yamada, Hiroyuki Suzuki, Toshihide Ezoe, Koji Kawato