Patents by Inventor Isamu Ghoda
Isamu Ghoda 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: 5630849Abstract: The invention is a method of dyeing aliphatic polyester filaments with a disperse dye by selecting a dyeing temperature, dyeing pH, and dyeing time in such a way that the weight average molecular weight of the aliphatic polyester filament has a lowering ratio of 20% or less.The invention is a method for dyeing the aliphatic polyester filament with good reproducibility and level dyeing property while substantially maintaining the molecular weight and the essential excellent properties of the aliphatic polyester filament, and can provide dyed articles which have high strength, are excellent in level dyeing property and color fastness to light, and have various hues.Type: GrantFiled: March 8, 1996Date of Patent: May 20, 1997Assignee: Mitsui Toatsu Chemicals, Inc.Inventors: Taiji Kameoka, Isamu Kawamura, Isamu Ghoda, Masanobu Ajioka, Keisuke Takuma, Akihiro Yamaguchi, Hiroshi Suizu
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Patent number: 5567470Abstract: A blue dyestuff represented by the formula (2) ##STR1## wherein each of R.sub.1, R.sub.2 and R.sub.3 is independently a hydrogen atom, halogen atom, nitro group, hydroxy group, alkyl group which may have a substituent, alkoxy group, alkylsulfonylamino group or alkylcarbonylamino group, and each of R.sub.4 and R.sub.5 is independently an alkyl group which may have a substituent, and a heat-sensitive transfer sheet containing the above-mentioned dyestuff.Type: GrantFiled: August 18, 1995Date of Patent: October 22, 1996Assignee: Mitsui Toatsu Chemicals, IncorporatedInventors: Hitoshi Koshida, Isamu Ghoda, Tsukasa Ohyama, Keisuke Takuma
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Patent number: 5387686Abstract: A dyestuff for heat-sensitive transfer record is here disclosed which can be represented by the formula (1) ##STR1## wherein R.sub.1 is a hydrogen atom, alkyl group having 1 to 8 carbon atoms or cycloalkyl group; R.sub.2 is a hydrogen atom, halogen atom, alkoxy group which may be substituted, alkylthio group which may be substituted or arylthio group which may be substituted; R.sub.3 is a branched alkyl group having 3 to 5 carbon atoms, O-substituted oxycarbonyl group, N-substituted aminocarbonyl group in which an N-substituted group may form a ring, or a substituted or unsubstituted heterocyclic ring having two or more atoms of one or more kinds selected from the group consisting of a nitrogen atom, oxygen atom and sulfur atom; and when R.sub.1 is a hydrogen atom, R.sub.Type: GrantFiled: December 14, 1993Date of Patent: February 7, 1995Assignees: Mitsui Toatsu Chemicals, Incorporated, Dai Nippon Printing Co., Ltd.Inventors: Tsukasa Ohyama, Yasushi Shimokawa, Yoriaki Matsuzaki, Keisuke Takuma, Isamu Ghoda, Hitoshi Koshida, Ryohei Takiguchi, Hiroshi Eguchi, Komei Kafuku, Masayuki Nakamura
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Patent number: 5358536Abstract: According to the present invention, there can be provided a black dyestuff for heat-sensitive transfer record comprising at least one orange dyestuff represented by the formulaAr.sub.1 --N=N--Ar.sub.2 --N=N--Ar.sub.3 ( 1)[wherein each of Ar.sub.1, Ar.sub.2 and Ar.sub.3 is independently an aryl group which may have a substituent] and at least one blue dyestuff represented by the formula ##STR1## [wherein each of R.sub.1, R.sub.2 and R.sub.3 is independently a hydrogen atom, halogen atom, nitro group, hydroxyl group, alkyl group which may have a substituent, alkoxy group, alkylsulfonylamino group or alkylcarbonylamino group, and each of R.sub.4 and R.sub.5 is independently an alkyl group which may have a substituent, and a black heat-sensitive transfer sheet in which the above-mentioned dyestuff is used.Type: GrantFiled: July 31, 1992Date of Patent: October 25, 1994Assignee: Mitsui Toatsu Chemicals, IncorporatedInventors: Hitoshi Koshida, Isamu Ghoda, Tsukasa Ohyama, Keisuke Takuma
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Patent number: 5359075Abstract: A novel quinophthalone compounds and the 2(2')-ene wherein when R.sub.1 is tautomer a hydrogen atom, tautomer thereof an alkyl group having 2 to 8 carbon atoms which may be branched cycloalkyl group having 5 or 6 ring atoms, R.sub.2 is a hydrogen atom, halogen atom, alkoxy group, alkylthio group, arylthio group which may be substituted, by alkyl of 1 to 4 carbon atoms, each of R.sub.3 and R.sub.4 is a hydrogen atom, alkyl group, N-substituted aminocarbonyl group, or a heterocyclic ring substituent having two or more ring atoms of one or more kinds selected from the group consisting of a nitrogen atom, oxygen atom and sulfur atom, R.sub.3 and R.sub.4 collectively with the ring carbon atoms to which they are attached form an N-substituted maleimide ring; provided however, that when R.sub.1 is a hydrogen atom, is a hydrogen atom, and R.sub.Type: GrantFiled: August 5, 1992Date of Patent: October 25, 1994Assignee: Mitsui Toatsu Chemicals, IncorporatedInventors: Tsukasa Ohyama, Yasushi Shimokawa, Yoriaki Matsuzaki, Keisuke Takuma, Isamu Ghoda, Hitoshi Koshida
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Patent number: 5302573Abstract: A magenta dyestuff for sublimation heat transfer recording is here disclosed which is represented by the formula (I) ##STR1## wherein R.sup.1 is an alkyl group or alkoxy group, R.sup.2 is an alkyl group, aryl group or halogenoalkyl group, R.sup.3 is an alkyl group, aryl group, alkoxyalkyl group, cyanoalkyl group, alkylcarboxyalkyl group or halogenoalkyl group, X is a hydrogen atom or alkoxy group, and Y is a hydrogen atom, alkoxy group, alkylcarbonylamino group or alkyl-sulfonylamino group, and this dyestuff is excellent in solubility, ribbon shelf stability, dye-fixing properties, durability and light resistance.Type: GrantFiled: December 23, 1992Date of Patent: April 12, 1994Assignee: Mitsui Toatsu Chemicals, Inc.Inventors: Tsukasa Ohyama, Yasushi Shimokawa, Keisuke Takuma, Isamu Ghoda, Hitoshi Koshida, Akitoshi Igata
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Patent number: 5300475Abstract: Disclosed are magenta anthraquinone dyestuffs for sublimation thermaltransfer printing of one of the formulas ##STR1## wherein R is a halogen atom, methyl or methoxy; wherein R.sub.1 is a hydrogen atom, hydroxyl, a halogen atom, alkyl of 1 to 4 carbon atoms or alkoxy of 1 to 4 carbon atoms; and wherein R.sub.2 is a hydrogen atom, a halogen atom, alkyl or 1 to 4 carbon atoms or alkoxy of 1 to 4 carbon atoms, with the proviso that in formula (3) either R.sub.1 or R.sub.2 is not a hydrogen atom.Type: GrantFiled: August 31, 1992Date of Patent: April 5, 1994Assignee: Mitsui Toatsu Chemicals, IncorporatedInventors: Keisuke Takuma, Tsukasa Ohyama, Tamio Mikoda, Isamu Ghoda, Hitoshi Koshida, Akitoshi Igata
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Patent number: 5296445Abstract: A dyestuff for heat-sensitive transfer record is here disclosed which can be represented by the formula (1) ##STR1## wherein R.sub.1 is a hydrogen atom, alkyl group having 1 to 8 carbon atoms or cycloalkyl group; R.sub.2 is a hydrogen atom, halogen atom, alkoxy group which may be substituted, alkylthio group which may be substituted or arylthio group which may be substituted; R.sub.3 is a branched alkyl group having 3 to 5 carbon atoms, O-substituted oxycarbonyl group, N-substituted aminocarbonyl group in which an N-substituted group may form a ring, or a substituted or unsubstituted heterocyclic ring having two or more atoms of one or more kinds selected from the group consisting of a nitrogen atom, oxygen atom and sulfur atom; and when R.sub.1 is a hydrogen atom, R.sub.Type: GrantFiled: August 5, 1992Date of Patent: March 22, 1994Assignees: Mitsui Toatsu Chemicals, Incorporated, Dai Nippon Printing Co., Ltd.Inventors: Tsukasa Ohyama, Yasushi Shimokawa, Yoriaki Matsuzaki, Keisuke Takuma, Isamu Ghoda, Hitoshi Koshida, Ryohei Takiguchi, Hiroshi Eguchi, Komei Kafuku, Masayuki Nakamura
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Patent number: 5183474Abstract: Described herein are heat-sensitive sublimation transfer cyan dyes represented by the following formula (I): ##STR1## wherein R.sub.1 represents a hydrogen atom, an alkyl group, an alkoxyl group, an alkylcarbonylamino group, a formylamino group or a halogen atom, R.sub.2 and R.sub.3 represent an alkyl group, an alkenyl group, an alkoxyalkyl group, an aralkyl group, an aryl group, a halogenoalkyl group or a cyanoalkyl group or are coupled together to form a ring, and X represents any one of the following groups: ##STR2## Heat-sensitive sublimation transfer sheets containing one or more dyes selected from the group of the above dyes are also described.Type: GrantFiled: May 13, 1991Date of Patent: February 2, 1993Assignee: Mitsui Toatsu Chemicals Inc.Inventors: Tsukasa Ohyama, Yasushi Shimokawa, Isamu Ghoda, Keisuke Takuma, Hitoshi Koshida
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Patent number: 5182395Abstract: Disclosed are a novel compound represented by the formula ##STR1## and compositions for sublimation transfer records and for color toners containing the same.Type: GrantFiled: October 12, 1990Date of Patent: January 26, 1993Assignee: Mitsui Toatsu Chemicals, Inc.Inventors: Keisuke Takuma, Tsukasa Ohyama, Akitoshi Igata, Tamio Mikoda, Isamu Ghoda, Hitoshi Koshida
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Patent number: 5168093Abstract: Disclosed are magenta anthraquinone dyestuffs for sublimation thermaltransfer printing of one of the formulas ##STR1## wherein R is a halogen atom, methyl or methoxy; wherein R.sub.1 is a hydrogen atom, hydroxyl, a halogen atom, alkyl of 1 to 4 carbon atoms or alkoxy of 1 to 4 carbon atoms; and wherein R.sub.2 is a hydrogen atom, a halogen atom, alkyl or 1 to 4 carbon atoms or alkoxy of 1 to 4 carbon atoms, with the proviso that in formula (3) either R.sub.1 or R.sub.2 is not a hydrogen atom.Type: GrantFiled: July 10, 1990Date of Patent: December 1, 1992Assignee: Mitsui Toatsu Chemicals Inc.Inventors: Keisuke Takuma, Tsukasa Ohyama, Tamio Mikoda, Isamu Ghoda, Hitoshi Koshida, Akitoshi Igata
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Patent number: 5002925Abstract: Disclosed are a novel compound represented by the formula ##STR1## a composition for sublimation transfer record containing the above-mentioned compound, and a composition for color toner containing the above-mentioned compound.Type: GrantFiled: April 14, 1989Date of Patent: March 26, 1991Assignee: Mitsui Toatsu Chemicals, IncorporatedInventors: Keisuke Takuma, Tsukasa Ohyama, Akitoshi Igata, Tamio Mikoda, Isamu Ghoda, Hitoshi Koshida
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Patent number: 4954410Abstract: A novel negative charge color toner composition for electrostatic charge development having good light resistance and copy sharpness which contains, as a dyestuff in a toner resin, a 1-amino-2-phenoxy- or 2-thiophenoxy-4-hydroxyanthraquinone whose phenoxy or thophenoxy group is substituted and/or a 1,4-diamino-2,3-phenoxyanthraquinone whose phenoxy group is substitited, which can be conventionally produced.Type: GrantFiled: February 24, 1989Date of Patent: September 4, 1990Assignee: Mitsui Toatsu Chemicals, IncorporatedInventors: Keisuke Takuma, Tsukasa Ohyama, Isamu Ghoda, Tamio Mikoda, Hitoshi Koshida, Akitoshi Igata