Patents by Inventor Tsugio Maeshima
Tsugio Maeshima 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: 5217699Abstract: A calcium-phosphate type hydroxyapatite for chromatographic separation is in the form of spherulites having a mean particle diameter of 0.5 to 50 .mu.m, preferably 1 to 10 .mu.m. The spherulites are each an aggregate mainly of acicular crystallites belonging to a series of hexagonal systems and having unit lattice constants of 9.58.+-.0.08 .ANG. for the a axis and 7.00.+-.0.05 .ANG. for the c axis. The hydroxyapatite is produced by granulating a calcium=phosphate type hydroxyapatite in the form of a gel and then firing the granular apatite at 400.degree. to 700.degree. C., preferably at 500.degree. to 600.degree. C. The firing is performed by heating the granules in the presence of oxygen or air for a given period of time.Type: GrantFiled: July 17, 1991Date of Patent: June 8, 1993Assignees: Toa Nenryo Kogyo Kabushiki Kaisha, Ashaikogaku Kogyo Kabushiki KaishaInventors: Nobuaki Tagaya, Hideyuki Kuwakara, Takao Hashimoto, Noriko Komatsu, Keiko Fukamachi, Tsugio Maeshima, Toshihiro Ishikawa, Tetsuro Ogawa
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Patent number: 5098894Abstract: The binderless zeolite of this invention is comprised more than 90% of crystalline aluminosilicate which is produced by crystalized a binder contained in extrudate obtained by molding a mixture of crystalline aluminosilicate and binder of silica-alumina. This binderless zeolite can improve it's catalytic activity without weaken the strength of the extrudate, since a so-called secondary pores also act as catalyst. Especially, when more than 50% of TSZ zeolite is contained, the catalytic ability of binderless zeolite is so excellent that it is preferably used as the catalyst for selective cracking of n-parafins of alkylation of aromatics using alkylation agents such as alcohols and olefins.Type: GrantFiled: September 26, 1990Date of Patent: March 24, 1992Assignee: Toa Nenryo Kogyo K.K.Inventors: Satoshi Sakurada, Nobuaki Tagaya, Tadashi Miura, Tsugio Maeshima, Takao Hashimoto
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Patent number: 5082566Abstract: A calcium-phosphate type hydroxyapatite for chromatographic separation is in the form of spherulites having a mean particle diameter of 0.5 to 50 .mu.m, preferably 1 to 10 .mu.m. The spherulites are each an aggregate mainly of acicular crystallites belonging to a series of hexagonal systems and having unit lattice constants of 9.58.+-.0.08 .ANG. for the a axis and 7.00.+-.0.05 .ANG. for the c axis. The hydroxyapatite is produced by granulating a calcium-phosphate type hydroxyapatite in the form of a gel and then firing the granular apatite at 400.degree. to 700.degree. C., preferably at 500.degree. to 600.degree. C. The firing is performed by heating the granules in the presence of oxygen or air for a given period of time.Type: GrantFiled: September 12, 1988Date of Patent: January 21, 1992Assignees: Toa Nenryo Kogyo Kabushiki Kaisha, Asahi Kogaku Kogyo Kabushiki KaishaInventors: Nobuaki Tagaya, Hideyuki Kuwahara, Takao Hashimoto, Noriko Komatsu, Keiko Fukamachi, Tsugio Maeshima, Toshihiro Ishikawa, Tetsuro Ogawa
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Patent number: 4977120Abstract: The binderless zeolite of this invention is comprised more than 90% of crystalline aluminosilicate which is produced by crystalize a binder contained in extrudate obtained by molding a mixture of crystalline aluminosilicate and binder of silica-alumina. This binderless zeolite can improve it's catalytic activity without weaken the strength of the extrudate, since a so-called secondary pores also act as catalyst. Especially, when more than 50% of TSZ zeolite is contained, the catalytic ability of binderless zeolite is so excellent that it is preferably used as the catalyst for selective cracking of n-parafins or alkylation of aromatics using alkylation agents such as alcohols and olefins.Type: GrantFiled: April 13, 1988Date of Patent: December 11, 1990Assignee: Toa Nenryo Kogyo K.K.Inventors: Satoshi Sakurada, Nobuaki Tagaya, Tadashi Miura, Tsugio Maeshima, Takao Hashimoto
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Patent number: 4794171Abstract: A calcium-phosphate type hydroxyapatite which belongs to a series of hexagonal systems has unit lattice constants of 9.58.+-.0.08 .ANG. for the a axis and 7.00.+-.0.05 .ANG. for the c axis. Its Ca/P ratio is in the range of 1.50 to 1.90. It is for use as a column packing material for chromatographic separation of biopolymers. The hydroxyapatite is produced by firing it in the form of a gel or powder at a temperature of 400.degree. to 700.degree. C. As a gel the hydroxyapatite takes the form of a suspension or slurry. A powder is prepared by removing moisture from the hydroxyapatite in the gel form and then drying. Either gel or powder is fired by heating in the presence of oxygen or air at 500.degree. to 600.degree.0 C.Type: GrantFiled: September 22, 1986Date of Patent: December 27, 1988Assignee: Toa Nenryo Kogyo Kabushiki KaishaInventors: Nobuaki Tagaya, Hideyuki Kuwahara, Takao Hashimoto, Noriko Komatsu, Keiko Fukamachi, Tsugio Maeshima
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Patent number: 4781904Abstract: A calcium-phosphate type hydroxyapatite for chromatographic separation is in the form of spherulites having a mean particle diameter of 0.5 to 50 .mu.m, preferably 1 to 10 .mu.m. The spherulites are each an aggregate mainly of acicular crystallites belonging to a series of hexagonal systems and having unit lattice constants of 9.58.+-.0.08 .ANG. for the a axis and 7.00.+-.0.05 .ANG. for the c axis. The hydroxyapatite is produced by granulating a calcium-phosphate type hydroxyapatite in the form of a gel and then firing the granular apatite at 400.degree. to 700.degree. C., preferably at 500.degree. to 600.degree. C. The firing is performed by heating the granules in the presence of oxygen or air for a given period of time.Type: GrantFiled: September 22, 1986Date of Patent: November 1, 1988Assignees: Tao Nenryo Kogyo Kabushiki Kaisha, Asahi Kogaku Kogyo Kabushiki KaishaInventors: Nobuaki Tagaya, Hideyuki Kuwahara, Takao Hashimoto, Noriko Komatsu, Keiko Fukamachi, Tsugio Maeshima, Toshihiro Ishikawa, Tetsuro Ogawa
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Patent number: 4513166Abstract: 1-Butene and isobutene are effectively separated without isomerization of 1-butene by contacting an isobutene-containing hydrocarbon mixture with a solid acid catalyst having a solid acid quantity of 0.05 to 0.25 mmol/g of solid acid catalyst, represented by the adsorption quantity of pyridine, thus low-polymerizing selectively isobutene and then separating the low polymers of isobutene from 1-butene.Type: GrantFiled: April 6, 1984Date of Patent: April 23, 1985Assignee: Toa Nenryo Kogyo Kabushiki KaishaInventors: Satoshi Sakurada, Takao Hashimoto, Nobuaki Tagaya, Tsugio Maeshima, Kayako Ueda, Masahiro Kokubo
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Patent number: 4454367Abstract: 1-Butane and isobutene are effectively separated without isomerization of 1-butene by contacting an isobutene-containing hydrocarbon mixture with a solid acid catalyst having a solid acid quantity of 0.05 to 0.25 mmol/g of solid acid catalyst, represented by the adsorption quantity of pyridine, thus low-polymerizing selectively isobutene and then separating the low polymers of isobutene from 1-butene.Type: GrantFiled: March 15, 1983Date of Patent: June 12, 1984Assignee: Toa Nenryo Kogyo Kabushiki KaishaInventors: Satoshi Sakurada, Takao Hashimoto, Nobuaki Tagaya, Tsugio Maeshima, Kayako Ueda, Masahiro Kokubo
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Patent number: 4104361Abstract: Nitrogen oxides are removed from gaseous mixtures comprising the same by contacting with a catalyst comprising a base metal component carried on a natural or synthetic zeolite in the presence of ammonia. The alkali metal content of the zeolite is carefully controlled through ion exchange with an alkaline earth metal compound.Type: GrantFiled: April 6, 1977Date of Patent: August 1, 1978Assignee: Exxon Research & Engineering Co.Inventors: Eiichiroh Nishikawa, Takuji Itoh, Tsugio Maeshima, Setsuo Kamiyama
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Patent number: 4052337Abstract: Nitrogen oxides are removed from gaseous mixtures comprising the same by contacting with a catalyst comprising a base metal component carried on a natural or synthetic zeolite in the presence of ammonia. The alkali metal content of the zeolite is carefully controlled through ion exchange with an alkaline earth metal compound.Type: GrantFiled: March 19, 1976Date of Patent: October 4, 1977Assignee: Toa Nenryo Kogyo Kabushiki KaishaInventors: Eiichiroh Nishikawa, Takuji Itoh, Tsugio Maeshima, Setsuo Kamiyama
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Patent number: 4046888Abstract: Process for removing nitrogen oxides from gaseous mixtures comprising the same. Ammonia in an amount excessive over the stoichiometric amount necessary for reducing the nitrogen oxides is introduced into a reaction zone containing a catalyst. Then, ammonia in a minimum amount necessary for reduction of the nitrogen oxides is introduced into the reaction zone.Type: GrantFiled: March 11, 1976Date of Patent: September 6, 1977Assignee: Toa Nenryo Kogyo Kabushiki KaishaInventors: Tsugio Maeshima, Eiichiroh Nishikawa, Mitsuko Nakamura