Patents by Inventor Toshiharu Yokoyama

Toshiharu Yokoyama 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: 20150217278
    Abstract: A metal-supporting catalyst for decomposing ammonia into hydrogen and nitrogen. The catalyst shows a high performance with a low cost and being advantageous from the viewpoint of resources, and an efficient method for producing hydrogen using the catalyst. The catalyst catalytically decomposes ammonia gas to generate hydrogen. The hydrogen generation catalyst includes, as a support, a mayenite type compound having oxygen ions enclosed therein or a mayenite type compound having 1015 cm?3 or more of conduction electrons or hydrogen anions enclosed therein, and metal grains for decomposing ammonia are supported on the surface of the support. Hydrogen is produced by continuously supplying 0.1-100 vol % of ammonia gas to a catalyst layer that comprises the aforesaid catalyst, and reacting the same at a reaction pressure of 0.01-1.0 MPa, at a reaction temperature of 300-800° C. and at a weight hourly space velocity (WHSV) of 500/mlg?1h?1 or higher.
    Type: Application
    Filed: August 20, 2013
    Publication date: August 6, 2015
    Applicant: TOKYO INSTITUTE OF TECHNOLOGY
    Inventors: Hideo Hosono, Fumitaka Hayashi, Toshiharu Yokoyama, Yoshitake Toda, Michikazu Hara, Masaaki Kitano
  • Publication number: 20130183224
    Abstract: The present invention provides a catalyst substance that is stable and performs well in the synthesis of ammonia, one of the most important chemical substances for fertilizer ingredients and the like. The catalyst substance exhibits catalytic activity under mild synthesis conditions not requiring high pressure, and is also advantageous from a resource perspective. Further provided is a method for producing the same. This catalyst comprises a supported metal catalyst that is supported on a mayenite type compound including conduction electrons of 1015 cm?3 or more and serving as a support for the ammonia synthesis catalyst. The mayenite type compound used as the support may take any form, including that of powder, a porous material, a sintered body, a thin-film, or a single crystal. Use of this catalyst makes it possible to increase the electron donating ability toward a transition metal.
    Type: Application
    Filed: December 6, 2011
    Publication date: July 18, 2013
    Applicant: TOKYO INSTITUTE OF TECHNOLOGY
    Inventors: Hideo Hosono, Michikazu Hara, Masaaki Kitano, Sung Wng Kim, Satoru Matsuishi, Yoshitake Toda, Toshiharu Yokoyama, Fumitaka Hayashi
  • Patent number: 8343128
    Abstract: A multiple-chamber medical container 1 comprises a container body 5 having two chambers 9, 11 for containing medicaments therein and a partitioning weak seal portion 13 for separating the chambers 9, 11 from each other, a medicinal outlet portion 7 attached to the container body 5 for discharging the medicaments from the chambers therethrough, and an openable small container 15 disposed in the first chamber 9 and having a medicament enclosed therein, the partitioning seal portion 15 being openable so as to cause the chambers 9, 11 to communicate with each other for use. The small container 15 can be opened by opening the partitioning weak seal portion 13.
    Type: Grant
    Filed: April 25, 2003
    Date of Patent: January 1, 2013
    Assignee: Otsuka Pharmaceutical Factory, Inc.
    Inventors: Katsuyoshi Nagao, Toshiharu Yokoyama, Keiichi Kawakami
  • Publication number: 20080281073
    Abstract: It is to provide a high purity oxydiphthalic anhydride with which, in production of a polyimide containing an oxydiphthalic anhydride, one having sufficiently high strength can be produced, and an industrially simple process for producing it. A high purity oxydiphthalic anhydride, which has a content of fine insoluble particles having a projected area diameter of from 5 to 20 ?m, of at most 3,000 particles per 1 g, and has a light transmittance at 400 nm of at least 98.5% in a light path length of 1 cm when dissolved in acetonitrile at a concentration of 4 g/L.
    Type: Application
    Filed: December 7, 2005
    Publication date: November 13, 2008
    Applicant: MITSUBISHI CHEMICAL CORPORATION
    Inventors: Kazuhiro Nagayama, Toshiharu Yokoyama, Jun Takahara, Makoto Nitta, Hiroshi Mikami
  • Publication number: 20050177128
    Abstract: A multiple-chamber medical container 1 comprises a container body 5 having two chambers 9, 11 for containing medicaments therein and a partitioning weak seal portion 13 for separating the chambers 9, 11 from each other, a medicinal outlet portion 7 attached to the container body 5 for discharging the medicaments from the chambers therethrough, and an openable small container 15 disposed in the first chamber 9 and having a medicament enclosed therein, the partitioning seal portion 15 being openable so as to cause the chambers 9, 11 to communicate with each other for use. The small container 15 can be opened by opening the partitioning weak seal portion 13.
    Type: Application
    Filed: April 25, 2003
    Publication date: August 11, 2005
    Inventors: Katsuyoshi Nagao, Toshiharu Yokoyama, Keiichi Kawakami
  • Patent number: 6700003
    Abstract: A method for producing a saturated cyclic ether from a fatty acid ester of an &agr;, &dgr;-diol stably in high yield over a long period of time, is presented. It is a process for producing a saturated cyclic ether, which comprises reacting a mono- and/or di-fatty acid ester of an &agr;, &dgr;-diol in the presence of a solid acid catalyst, wherein the reaction is carried out in such a state that at least 50 mol % of the fatty acid ester supplied to the reaction system is vaporized.
    Type: Grant
    Filed: December 12, 2002
    Date of Patent: March 2, 2004
    Assignee: Mitsubishi Chemical Corporation
    Inventors: Kazuhiko Kiyooka, Toshiharu Yokoyama
  • Publication number: 20030149282
    Abstract: A method for producing a saturated cyclic ether from a fatty acid ester of an &agr;,&dgr;-diol stably in high yield over a long period of time, is presented. It is a process for producing a saturated cyclic ether, which comprises reacting a mono- and/or di-fatty acid ester of an &agr;,&dgr;-diol in the presence of a solid acid catalyst, wherein the reaction is carried out in such a state that at least 50 mol % of the fatty acid ester supplied to the reaction system is vaporized.
    Type: Application
    Filed: December 12, 2002
    Publication date: August 7, 2003
    Applicant: MITSUBISHI CHEMICAL CORPORATION
    Inventors: Kazuhiko Kiyooka, Toshiharu Yokoyama
  • Patent number: 6087528
    Abstract: A process for producing hydroxyalkyl monoacrylate of the present invention, comprises the steps of: reacting acrylic acid or an acrylic acid derivative with alkane diol for esterification and/or transesterification therebetween in the presence of a reaction catalyst comprising a stannoxane compound; recovering said reaction catalyst from a liquid reaction product by extraction; and recycling the recovered reaction catalyst to a reaction system for said esterification and/or transesterification. The process of the present invention is an industrially useful process for producing hydroxyalkyl monoacrylate, which is excellent in reactivity, selectivity for an aimed product, stability of a reaction catalyst used and stability of a reaction substrate and product, and is improved so as to effectively recover and reuse the reaction catalyst.
    Type: Grant
    Filed: May 26, 1998
    Date of Patent: July 11, 2000
    Assignee: Mitsubishi Chemical Corporation
    Inventors: Toshiharu Yokoyama, Yuuji Kawaragi, Kouya Murai
  • Patent number: 6072082
    Abstract: A process for producing 2,2'-bis(hydroxymethyl)alkanoic acid of the present invention, comprises:a 2,2'-bis(hydroxymethyl)alkanal production step (A1) of reacting aliphatic aldehyde having two hydrogen atoms bonded to .alpha.
    Type: Grant
    Filed: February 9, 1999
    Date of Patent: June 6, 2000
    Assignee: Nippon Kasei Chemical Company
    Inventors: Hideshi Saito, Mikio Suzuki, Shoji Sakamoto, Toshiharu Yokoyama, Kouji Maeda
  • Patent number: 5994592
    Abstract: The present invention relates to a process for producing 2,2'-bis(hydroxymethyl)alkanal and 2,2'-bis(hydroxymethyl)alkanoic acid as raw materials for dimethylol alkanoic acids or trimethylol alkanes, which are useful for the production of polyesters, polyurethanes, alkyd resins and the like, in an industrially advantageous manner.
    Type: Grant
    Filed: February 12, 1998
    Date of Patent: November 30, 1999
    Assignee: Nippon Kasei Chemical Company Limited
    Inventors: Toshiharu Yokoyama, Kouji Maeda
  • Patent number: 5569803
    Abstract: A method for producing a cycloolefin, which comprises partially hydrogenating a monocyclic aromatic hydrocarbon in the presence of water and a ruthenium catalyst supported on silica modified by zirconium oxide.
    Type: Grant
    Filed: December 23, 1994
    Date of Patent: October 29, 1996
    Assignee: Mitsubishi Chemical Corporation
    Inventors: Takahiko Takewaki, Naoko Fujita, Toshiharu Yokoyama, Takao Maki
  • Patent number: 5239108
    Abstract: A process for producing an aliphatic or alicyclic aldehyde is disclosed, which process comprises the step of hydrogenating an aliphatic or alicyclic carboxylic acid or a derivative thereof with molecular hydrogen in the presence of a catalyst, wherein the catalyst is a zirconium oxide catalyst which contains chromium as an essential component, has a weakly basic site amount of more than 0.03 mmol/g as determined by a temperature programmed desorption method using carbon dioxide as an adsorbate in which the amount of carbon dioxide desorbed in the temperature range of from 100.degree. to 250.degree. C. is measured, and has pores having a radius of from 20 to 500 .ANG. in an amount of not less than 0.1 cc/g and pores having a radius of from 1,000 to 50,000 .ANG. in an amount of not less than 0.05 cc/g as measured with a mercury porosimeter. Aldehydes can be obtained directly from aliphatic or alicyclic carboxylic acids or derivatives thereof in high yield.
    Type: Grant
    Filed: October 20, 1992
    Date of Patent: August 24, 1993
    Assignee: Mitsubishi Kasei Corporation
    Inventors: Toshiharu Yokoyama, Naoko Matsuyama, Takao Maki
  • Patent number: 4791235
    Abstract: A method of separating 2,6-dimethylnaphthalene from a feed material containing a mixture of dimethylnaphthalene isomers comprises the steps of:adsorption separation using an adsorbent of a zeolite Y containing alkali metal or zinc and a desorbent of an organic solvent mainly composed of paraxylene and/or orthoxylene to obtain a solution consisting of the desorbent and the feed material containing 2,6-dimethylnaphthalene at a concentration of at least 60 wt % on the feed material other than desorbent; andcrystallization of the solution having a concentration of the desorbent at 30 to 90 wt % to obtain 2,6-dimehtylnaphthalene of high purity in a crystalline form.
    Type: Grant
    Filed: November 30, 1987
    Date of Patent: December 13, 1988
    Assignee: Mitsubishi Chemical Industries Limited
    Inventors: Takao Maki, Toshiharu Yokoyama, Akio Nakanishi, Katashi Shioda, Haruki Asatani
  • Patent number: 4613700
    Abstract: An improved process for catalytic hydrogenation of aromatic carboxylic acids to produce aromatic aldehydes is described, using a catalyst comprising zirconium oxide containing as an essential component at least one element selected from the group consisting of chromium, manganese, iron, cobalt, zinc, bismuth, lead, rhenium and the elements of Group III of periods 3 to 6 of the periodic table; the process results in improved catalyst activity and produces the desired aromatic aldehydes in high yield.
    Type: Grant
    Filed: January 18, 1985
    Date of Patent: September 23, 1986
    Assignee: Mitsubishi Chemical Industries Limited
    Inventors: Takao Maki, Toshiharu Yokoyama
  • Patent number: 4478956
    Abstract: Bisphenols are prepared by condensation of a phenol with a ketone in the presence of a sulfonic acid type cation exchange resin partially modified with a pyridinealkanethiol of the formula:Py--(CH.sub.2).sub.n SHwherein n is a positive integer and Py is 3-pyridyl when n is 1, or 2-, 3- or 4-pyridyl when n is more than 1.
    Type: Grant
    Filed: August 4, 1983
    Date of Patent: October 23, 1984
    Assignee: Mitsubishi Chemical Industries Limited
    Inventors: Takao Maki, Tetsuo Masuyama, Toshiharu Yokoyama, Yoshiko Fujiyama
  • Patent number: 4423252
    Abstract: Bisphenols are prepared by condensation of a phenol with a ketone in the presence of a sulfonic acid type cation exchange resin partially modified with a pyridinealkanethiol of the formula:Py--(CH.sub.2).sub.n SHwherein n is a positive integer and Py is 3-pyridyl when n is 1, or 2-, 3- or 4-pyridyl when n is more than 1.
    Type: Grant
    Filed: July 2, 1981
    Date of Patent: December 27, 1983
    Assignee: Mitsubishi Chemical Industries Limited
    Inventors: Takao Maki, Tetsuo Masuyama, Toshiharu Yokoyama, Yoshiko Fujiyama
  • Patent number: 4405823
    Abstract: A process for producing phenols from benzenemonocarboxylic acids, or their salts, esters, or anhydrides is described, comprising contacting these starting materials with molecular oxygen-containing gas and steam in a liquid phase in the presence of a copper compound, a manganese compound, and a rare earth element compound. This process can be performed either by a one-step reaction method or by a two-step reaction method. In accordance with the present process, the formation of by-products such as high boiling by-products or diphenyl ethers is inhibited and the selectivity of phenols can be greatly increased.
    Type: Grant
    Filed: August 24, 1982
    Date of Patent: September 20, 1983
    Assignee: Mitsubishi Chemical Industries Limited
    Inventors: Takao Maki, Tetsuo Masuyama, Toshiharu Yokoyama
  • Patent number: 4165441
    Abstract: A process for producing styrene from 4-vinylcyclohexene by contacting it with molecular oxygen in a gaseous phase and at an elevated temperature in the presence of a catalyst which contains tin, antimony and oxygen.
    Type: Grant
    Filed: May 23, 1978
    Date of Patent: August 21, 1979
    Assignee: Mitsubishi Chemical Industries, Ltd.
    Inventors: Takeshi Okano, Tetsuo Masuyama, Toshiharu Yokoyama