Patents by Inventor Keiichi Tabata
Keiichi Tabata 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).
-
Publication number: 20190237772Abstract: The present invention provides an electrode material having excellent resistance to a high potential and strongly acidic environment, high conductivity, and excellent electrochemical properties; and a fuel cell including the same. The present invention also provides a method for simply and easily producing such an electrode material. The present invention relates to an electrode material containing: a titanium suboxide carrier whose crystal phase is single-phase Ti4O7 and having a specific surface area of 10 m2/g or more; and a noble metal and/or its oxide supported on the carrier.Type: ApplicationFiled: October 19, 2017Publication date: August 1, 2019Inventors: Keiichi TABATA, Seiichi YANO, Hiroshi TSUTSUMI, Jun NAITO, Mayu OTA, Miho KISHI
-
Patent number: 10035132Abstract: The invention provides a polycondensation catalyst for producing polyester by an esterification reaction or a transesterification reaction between a dicarboxylic acid or ester-forming derivative thereof and a glycol, wherein the polycondensation catalyst comprises particles of a solid base having on their surfaces either a coat layer of titanic acid in an amount of from 0.1 to 50 parts by weight in terms of TiO2 per 100 parts by weight of the solid base, or an inner coat layer of an oxide of at least one element selected from silicon, aluminum and zirconium or a composite oxide of at least two elements selected from silicon, aluminum and zirconium in an amount of from 1 to 20 parts by weight per 100 parts by weight of the solid base and an outer coat layer of titanic acid in an amount of from 0.1 to 50 parts by weight in terms of TiO2 per 100 parts by weight of the solid base, and wherein the solid base is hydrotalcite.Type: GrantFiled: May 28, 2015Date of Patent: July 31, 2018Assignee: SAKAI CHEMICAL INDUSTRY CO., LTD.Inventors: Toshikatsu Umaba, Hiromitsu Shimizu, Kenji Mori, Keiichi Tabata
-
Patent number: 9981248Abstract: The invention provides a polycondensation catalyst for producing polyester by an esterification reaction or a transesterification reaction between a dicarboxylic acid or ester-forming derivative thereof and a glycol, wherein the polycondensation catalyst comprises particles of a solid base having on their surfaces either a coat layer of titanic acid in an amount of from 0.1 to 50 parts by weight in terms of TiO2 per 100 parts by weight of the solid base, or an inner coat layer of an oxide of at least one element selected from silicon, aluminum and zirconium or a composite oxide of at least two elements selected from silicon, aluminum and zirconium in an amount of from 1 to 20 parts by weight per 100 parts by weight of the solid base and an outer coat layer of titanic acid in an amount of from 0.1 to 50 parts by weight in terms of TiO2 per 100 parts by weight of the solid base.Type: GrantFiled: June 28, 2006Date of Patent: May 29, 2018Assignee: SAKAI CHEMICAL INDUSTRY CO., LTD.Inventors: Toshikatsu Umaba, Hiromitsu Shimizu, Kenji Mori, Keiichi Tabata
-
Publication number: 20160229953Abstract: The invention provides a method for producing polyester comprising: a step for preparing an oligomer comprising a dicarboxylic acid diester by an esterification reaction or a transesterification reaction between a dicarboxylic acid or an ester-forming derivative thereof and a glycol, and then a step for subjecting the oligomer to melt-polycondensation to provide polyester as melt-polycondensate, wherein at least in the step of subjecting the oligomer to melt-polycondensation of the two steps, the oligomer is subjected to melt-polycondensation in the presence of titanium nitride and, as a polycondensation catalyst, particles of a solid base having a coating layer of titanic acid on the surfaces, thereby to provide polyester as melt-polycondensate.Type: ApplicationFiled: September 18, 2014Publication date: August 11, 2016Applicant: SAKAI CHEMICAL INDUSTRY CO., LTD.Inventors: Akihiro KAMON, Keiichi IKEGAWA, Jun NAITO, Keiichi TABATA
-
Patent number: 9346044Abstract: A copper-based catalyst precursor capable of achieving a high conversion ratio and high selectivity in the isomerization reaction of a ?,?-unsaturated alcohol portion and a method for producing the same and to provide a hydrogenation method in which the copper-based catalyst precursor is used are provided. Specifically, a copper-based catalyst precursor obtained by calcining a mixture containing copper, iron, aluminum, and calcium silicate in which an atomic ratio of iron and aluminum to copper [(Fe+Al)/Cu] is in a range of 1.71 to 2.5, an atomic ratio of aluminum to iron [Al/Fe] is in a range of 0.001 to 3.3, and calcium silicate is contained in a range of 15% by mass to 65% by mass at a temperature in a range of 500° C. to 1,000° C. and a hydrogenation method in which the copper-based catalyst precursor is used are provided.Type: GrantFiled: August 30, 2013Date of Patent: May 24, 2016Assignees: KURARAY CO., LTD., SAKAI CHEMICAL INDUSTRY CO., LTD.Inventors: Tomoaki Tsuji, Keiichi Tabata, Toshihiro Sugaya, Akio Nakashima
-
Patent number: 9289749Abstract: The invention provides a polycondensation catalyst for producing polyester by an esterification reaction or a transesterification reaction between a dicarboxylic acid or an ester-forming derivative thereof and a glycol, wherein the polycondensation catalyst comprises particles of a solid base having on the surfaces an inner coating layer of titanic acid in an amount of from 0.1 to 50 parts by weight in terms of TiO2 per 100 parts by weight of the solid base, and an outer coating layer either of an oxide of at least one element selected from aluminum, zirconium and silicon, or of a composite oxide of at least two elements selected from aluminum, zirconium and silicon on the surface of the inner coating layer in an amount of from 1 to 50 parts by weight per 100 parts by weight of the solid base.Type: GrantFiled: July 31, 2013Date of Patent: March 22, 2016Assignee: Sakai Chemical Industry Co., Ltd.Inventors: Keiichi Tabata, Akihiro Kamon, Keiichi Ikegawa, Jun Naito
-
Publication number: 20150258530Abstract: The invention provides a polycondensation catalyst for producing polyester by an esterification reaction or a transesterification reaction between a dicarboxylic acid or ester-forming derivative thereof and a glycol, wherein the polycondensation catalyst comprises particles of a solid base having on their surfaces either a coat layer of titanic acid in an amount of from 0.1 to 50 parts by weight in terms of TiO2 per 100 parts by weight of the solid base, or an inner coat layer of an oxide of at least one element selected from silicon, aluminum and zirconium or a composite oxide of at least two elements selected from silicon, aluminum and zirconium in an amount of from 1 to 20 parts by weight per 100 parts by weight of the solid base and an outer coat layer of titanic acid in an amount of from 0.1 to 50 parts by weight in terms of TiO2 per 100 parts by weight of the solid base, and wherein the solid base is hydrotalcite.Type: ApplicationFiled: May 28, 2015Publication date: September 17, 2015Inventors: Toshikatsu UMABA, Hiromitsu SHIMIZU, Kenji MORI, Keiichi TABATA
-
Publication number: 20150224492Abstract: A copper-based catalyst precursor capable of achieving a high conversion ratio and high selectivity in the isomerization reaction of a ?,?-unsaturated alcohol portion and a method for producing the same and to provide a hydrogenation method in which the copper-based catalyst precursor is used are provided. Specifically, a copper-based catalyst precursor obtained by calcining a mixture containing copper, iron, aluminum, and calcium silicate in which an atomic ratio of iron and aluminum to copper [(Fe+Al)/Cu] is in a range of 1.71 to 2.5, an atomic ratio of aluminum to iron [Al/Fe] is in a range of 0.001 to 3.3, and calcium silicate is contained in a range of 15% by mass to 65% by mass at a temperature in a range of 500° C. to 1,000° C. and a hydrogenation method in which the copper-based catalyst precursor is used are provided.Type: ApplicationFiled: August 30, 2013Publication date: August 13, 2015Applicants: KURARAY CO., LTD., SAKAI CHEMICAL INDUSTRY, CO., LTD.Inventors: Tomoaki Tsuji, Keiichi Tabata, Toshihiro Suguya, Akio Nakashima
-
Patent number: 9074047Abstract: The invention provides a method for producing a catalyst for producing polyester by an esterification reaction or a transesterification reaction between a dicarboxylic acid or an ester-forming derivative thereof and a glycol, the method comprising hydrolyzing an organic titanium compound in an organic solvent in which particles of a solid base are dispersed thereby to form a coat layer of titanic acid on the surface of the particles of a solid base.Type: GrantFiled: December 23, 2011Date of Patent: July 7, 2015Assignee: SAKAI CHEMICAL INDUSTRY CO., LTD.Inventors: Hiromitsu Shimizu, Keiichi Tabata, Akihiro Kamon
-
Patent number: 9051306Abstract: An agent for treating malignant tumors based on a new mechanism is provided, which comprises an indirubin derivative represented by formula (1) or a salt thereof: wherein A represents an alkylene group having 1 to 4 carbon atoms, and R1 to R4 each independently represent a hydrogen atom, a halogen atom, a hydroxy group, or an alkoxy group.Type: GrantFiled: July 5, 2012Date of Patent: June 9, 2015Assignee: NIHON UNIVERSITYInventors: Takashi Suzuki, Shinichi Miyairi, Hiroaki Saito, Keiichi Tabata
-
Patent number: 8901029Abstract: The invention provides a polycondensation catalyst for producing polyester by an esterification reaction or a transesterification reaction between a dicarboxylic acid or an ester-forming derivative thereof and a glycol, the polycondensation catalyst being obtained by hydrolyzing a water soluble titanium compound in the absence of a water soluble alkali in an aqueous slurry in which particles of a solid base are dispersed thereby to form on the surface of the particles of the solid base a coat layer of titanic acid in a content of from 0.1 to 50 parts by weight in terms of TiO2 per 100 parts by weight of the solid base. The invention further provides a method for producing the polycondensation catalyst, and polyester obtained using the polycondensation catalyst.Type: GrantFiled: September 10, 2010Date of Patent: December 2, 2014Assignee: Sakai Chemical Industry Co., Ltd.Inventors: Keiichi Tabata, Akihiro Kamon, Jun Naito, Keiichi Ikegawa
-
Publication number: 20140200253Abstract: An agent for treating malignant tumors based on a new mechanism is provided, which comprises an indirubin derivative represented by formula (1) or a salt thereof: wherein A represents an alkylene group having 1 to 4 carbon atoms, and R1 to R4 each independently represent a hydrogen atom, a halogen atom, a hydroxy group, or an alkoxy group.Type: ApplicationFiled: July 5, 2012Publication date: July 17, 2014Applicant: NIHON UNIVERSITYInventors: Takashi Suzuki, Shinichi Miyairi, Hiroaki Saito, Keiichi Tabata
-
Publication number: 20140073758Abstract: The invention provides a polycondensation catalyst for producing polyester by an esterification reaction or a transesterification reaction between a dicarboxylic acid or an ester-forming derivative thereof and a glycol, wherein the polycondensation catalyst comprises particles of a solid base having on the surfaces an inner coating layer of titanic acid in an amount of from 0.1 to 50 parts by weight in terms of TiO2 per 100 parts by weight of the solid base, and an outer coating layer either of an oxide of at least one element selected from aluminum, zirconium and silicon, or of a composite oxide of at least two elements selected from aluminum, zirconium and silicon on the surface of the inner coating layer in an amount of from 1 to 50 parts by weight per 100 parts by weight of the solid base.Type: ApplicationFiled: July 31, 2013Publication date: March 13, 2014Applicant: SAKAI CHEMICAL INDUSTRY CO., LTD.Inventors: Keiichi TABATA, Akihiro KAMON, Keiichi IKEGAWA, Jun NAITO
-
Patent number: 8247345Abstract: A method for producing a catalyst for producing polyester by an esterification reaction or a transesterification reaction between a dicarboxylic acid or an ester-forming derivative thereof and a glycol, which comprises hydrolyzing an organic silicon compound and/or an organic aluminum compound and/or an organic zirconium compound in an organic solvent in which particles of a solid are dispersed thereby to form an inner coat layer either of an oxide of at least one element selected from silicon, aluminum and zirconium or of a composite oxide of at least two elements selected from silicon, aluminum and zirconium, and then hydrolyzing an organic titanium compound in the organic solvent in which the particles of a solid base having the inner coat layer thereon are dispersed thereby to form an outer coat layer of titanic acid on the inner coat layer of the particles of a solid base.Type: GrantFiled: August 14, 2008Date of Patent: August 21, 2012Assignee: Sakai Chemical Industry Co., Ltd.Inventors: Hiromitsu Shimizu, Keiichi Tabata, Akihiro Kamon
-
Publication number: 20120172571Abstract: The invention provides a polycondensation catalyst for producing polyester by an esterification reaction or a transesterification reaction between a dicarboxylic acid or an ester-forming derivative thereof and a glycol, the polycondensation catalyst being obtained by hydrolyzing a water soluble titanium compound in the absence of a water soluble alkali in an aqueous slurry in which particles of a solid base are dispersed thereby to form on the surface of the particles of the solid base a coat layer of titanic acid in a content of from 0.1 to 50 parts by weight in terms of TiO2 per 100 parts by weight of the solid base. The invention further provides a method for producing such a polycondensation catalyst, and polyester obtained using such a polycondensation catalyst.Type: ApplicationFiled: September 10, 2010Publication date: July 5, 2012Inventors: Keiichi Tabata, Akihiro Kamon, Jun Naito, Keiichi Ikegawa
-
Publication number: 20120136133Abstract: The invention provides a method for producing a catalyst for producing polyester by an esterification reaction or a transesterification reaction between a dicarboxylic acid or an ester-forming derivative thereof and a glycol, the method comprising hydrolyzing an organic titanium compound in an organic solvent in which particles of a solid base are dispersed thereby to form a coat layer of titanic acid on the surface of the particles of a solid base.Type: ApplicationFiled: December 23, 2011Publication date: May 31, 2012Inventors: Hiromitsu SHIMIZU, Keiichi Tabata, Akihiro Kamon
-
Publication number: 20100152413Abstract: The invention provides a method for producing a catalyst for producing polyester by an esterification reaction or a transesterification reaction between a dicarboxylic acid or an ester-forming derivative thereof and a glycol, the method comprising hydrolyzing an organic titanium compound in an organic solvent in which particles of a solid base are dispersed thereby to form a coat layer of titanic acid on the surface of the particles of solid base.Type: ApplicationFiled: August 14, 2008Publication date: June 17, 2010Inventors: Hiromitsu Shimizu, Keiichi Tabata, Akihiro Kamon
-
Publication number: 20100041913Abstract: The invention provides a polycondensation catalyst for producing polyester by an esterification reaction or a transesterification reaction between a dicarboxylic acid or ester-forming derivative thereof and a glycol, wherein the polycondensation catalyst comprises particles of a solid base having on their surfaces either a coat layer of titanic acid in an amount of from 0.1 to 50 parts by weight in terms of TiO2 per 100 parts by weight of the solid base, or an inner coat layer of an oxide of at least one element selected from silicon, aluminum and zirconium or a composite oxide of at least two elements selected from silicon, aluminum and zirconium in an amount of from 1 to 20 parts by weight per 100 parts by weight of the solid base and an outer coat layer of titanic acid in an amount of from 0.Type: ApplicationFiled: June 28, 2006Publication date: February 18, 2010Inventors: Toshikatsu Umaba, Hiromitsu Shimizu, Kenji Mori, Keiichi Tabata
-
Publication number: 20090030073Abstract: A therapeutic agent for a malignant tumor containing a compound represented by the following formula (1) or (2): (wherein each of R1 and R2 represents a methyl group, or R1 and R2 may be linked together to form a methylene group; and R3 represents a hydrogen atom or a methoxy group).Type: ApplicationFiled: February 15, 2007Publication date: January 29, 2009Inventors: Takashi Suzuki, Yasuo Fujimoto, Taketo Uchiyama, Keiichi Tabata
-
Patent number: 6063782Abstract: Pyrrolopyridazine derivatives having the general formula. ##STR1## In the above formula, R.sup.1 represents a C.sub.2 -C.sub.6 alkenyl-group, a halogeno-C.sub.2 -C.sub.6 -alkenyl group, a C.sub.6 -C.sub.10 aryl-C.sub.2 -C.sub.6 -alkenyl group, a C.sub.2 -C.sub.6 alkynyl group, a C.sub.3 -C.sub.7 cycloalkyl group, a C.sub.3 -C.sub.7 cycloalkyl-C.sub.1 -C.sub.6 -alkyl group, a C.sub.5 -C.sub.7 cycloalkenyl-C.sub.1 -C.sub.6 -alkyl group or a halogeno-C.sub.1 -C.sub.6 -alkyl group; R.sup.2 and R.sup.3 are the same or different and each represents a hydrogen atom, a C.sub.1 -C.sub.6 alkyl group or a C.sub.6 -C.sub.10 aryl group; R.sup.4 represents a hydrogen atom or a C.sub.1 -C.sub.6 alkyl group; R.sup.5 represents a C.sub.6 -C.sub.Type: GrantFiled: July 17, 1996Date of Patent: May 16, 2000Assignees: Sankyo Company, Limited, Ube Industries, Ltd.Inventors: Tomio Kimura, Nobuhiko Shibakawa, Hiroshi Fujiwara, Etsuro Itoh, Keiji Matsunobu, Keiichi Tabata, Hiroshi Yasuda, Yoshimi Fujihara, deceased