Patents by Inventor Tetsuro Tojo

Tetsuro Tojo 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).

  • Patent number: 11518698
    Abstract: [Problem] A microorganism immobilized carrier is provided that is easy for microorganisms to adhere to, and is able to reduce the manufacturing cost of the microorganism immobilized carrier and the running cost of an apparatus that uses the microorganism immobilized carrier. [Solution] A microorganism immobilized carrier is characterized by including a carbon component and a resin, having a zeta potential of from ?25 mV to 0 mV, and containing microorganisms adhered to a surface thereof and/or an interior thereof. The microorganisms are preferably nitrifying bacteria. The carbon component preferably has a particle size of from 1 ?m to 1000 ?m.
    Type: Grant
    Filed: December 13, 2018
    Date of Patent: December 6, 2022
    Assignee: TOYO TANSO CO., LTD.
    Inventors: Masashi Zenki, Tetsuro Tojo, Masatoshi Takeshita, Tomoya Nakazono, Ai Ishikawa
  • Patent number: 11427489
    Abstract: [Problem] A carrier for retaining anammox bacteria, an anammox bacteria-adhered particle, and a wastewater treatment apparatus are provided that can remarkably reduce the start-up period for obtaining a nitrogen removal speed of 1 kg-N/m3/day. [Solution] A carrier for retaining anammox bacteria includes carbon particles. The carbon particles are desirably graphite particles, particularly isotropic graphite particles. The carbon particles desirably have a zeta potential of ?35 mV to 0 mV and an average particle size of 2 ?m to 1000 ?m.
    Type: Grant
    Filed: December 13, 2018
    Date of Patent: August 30, 2022
    Assignees: TOYO UNIVERSITY, TOYO TANSO CO.. LTD.
    Inventors: Tatsuo Sumino, Satoshi Sakuma, Tetsuro Tojo, Ai Ishikawa, Tomoya Nakazono, Masatoshi Takeshita
  • Publication number: 20210171373
    Abstract: [Problem] A microorganism immobilized carrier is provided that is easy for microorganisms to adhere to, and is able to reduce the manufacturing cost of the microorganism immobilized carrier and the running cost of an apparatus that uses the microorganism immobilized carrier. [Solution] A microorganism immobilized carrier is characterized by including a carbon component and a resin, having a zeta potential of from ?25 mV to 0 mV, and containing microorganisms adhered to a surface thereof and/or an interior thereof. The microorganisms are preferably nitrifying bacteria. The carbon component preferably has a particle size of from 1 ?m to 1000 ?m.
    Type: Application
    Filed: December 13, 2018
    Publication date: June 10, 2021
    Inventors: Masashi ZENKI, Tetsuro TOJO, Masatoshi TAKESHITA, Tomoya NAKAZONO, Ai ISHIKAWA
  • Publication number: 20210087091
    Abstract: [Problem] A carrier for retaining anammox bacteria, an anammox bacteria-adhered particle, and a wastewater treatment apparatus are provided that can remarkably reduce the start-up period for obtaining a nitrogen removal speed of 1 kg-N/m3/day. [Solution] A carrier for retaining anammox bacteria includes carbon particles. The carbon particles are desirably graphite particles, particularly isotropic graphite particles. The carbon particles desirably have a zeta potential of ?35 mV to 0 mV and an average particle size of 2 ?m to 1000 ?m.
    Type: Application
    Filed: December 13, 2018
    Publication date: March 25, 2021
    Inventors: Tatsuo SUMINO, Satoshi SAKUMA, Tetsuro TOJO, Ai ISHIKAWA, Tomoya NAKAZONO, Masatoshi TAKESHITA
  • Patent number: 9296660
    Abstract: Achieved is a ceramic carbon composite material and a ceramic-coated ceramic carbon composite material which are lighter than ceramics and excellent in at least one of properties including oxidation resistance, resistance to dust generation, heat conductivity, electrical conductivity, strength, and denseness. The ceramic carbon composite material is a ceramic carbon composite material in which an interfacial layer of a ceramic is formed between carbon particles of or containing graphite. The ceramic carbon composite material can be produced by forming a green body from ceramic-coated powder in which the surfaces of carbon particles of or containing graphite are coated with individual ceramic layers and sintering the green body.
    Type: Grant
    Filed: September 1, 2010
    Date of Patent: March 29, 2016
    Assignee: Toyo Tanso Co., Ltd.
    Inventors: Yoshinari Miyamoto, Weiwu Chen, Masaharu Nakamura, Taihei Matsumoto, Tetsuro Tojo
  • Patent number: 9085493
    Abstract: Produced is a silicon carbide-coated carbon base material in which a silicon carbide coating is densely and uniformly formed on the surface of a carbon base material, such as graphite. A production process includes the steps of: preparing a carbon base material the surface of which has basal plane sites of an SP2 carbon structure with no dangling bond and edge plane sites of an SP2 carbon structure with a dangling bond; and reacting the surface of the carbon base material with SiO gas in an atmosphere at a temperature of 1400° C. to 1600° C. and a pressure of 1 to 150 Pa to form silicon carbide, whereby the carbon base material coated with silicon carbide is produced.
    Type: Grant
    Filed: September 1, 2010
    Date of Patent: July 21, 2015
    Assignee: Toyo Tanso Co., Ltd.
    Inventors: Masaharu Nakamura, Yoshinari Miyamoto, Tetsuro Tojo
  • Patent number: 9045375
    Abstract: Provided is a novel method for producing a silicon carbide-carbon composite. A green body containing a carbonaceous material 2 having silicon nitride attached to a surface thereof is fired to obtain a silicon carbide-carbon composite 1.
    Type: Grant
    Filed: May 24, 2012
    Date of Patent: June 2, 2015
    Assignee: Toyo Tanso Co., Ltd.
    Inventors: Weiwu Chen, Yoshinari Miyamoto, Tetsuro Tojo
  • Patent number: 8916125
    Abstract: A method for producing a semiconductor diamond containing boron by the high pressure synthesis method, wherein a graphite material to be converted to the semiconductor diamond is mixed with boron or a boron compound, formed and fired, in such a way that the resultant graphite material contains a boron component uniformly dispersed therein and has an enhanced bulk density, a high purity and a reduced content of hydrogen.
    Type: Grant
    Filed: December 28, 2001
    Date of Patent: December 23, 2014
    Assignee: Toyo Tanso Co., Ltd.
    Inventors: Osamu Fukunaga, Hiroshi Okubo, Toshiaki Sogabe, Tetsuro Tojo
  • Publication number: 20140094355
    Abstract: Provided is a novel method for producing a silicon carbide-carbon composite. A green body containing a carbonaceous material 2 having silicon nitride attached to a surface thereof is fired to obtain a silicon carbide-carbon composite 1.
    Type: Application
    Filed: May 24, 2012
    Publication date: April 3, 2014
    Applicant: TOYO TANSO CO., LTD.
    Inventors: Weiwu Chen, Yoshinari Miyamoto, Tetsuro Tojo
  • Publication number: 20140086670
    Abstract: Provided are a joint of a metal material and a ceramic-carbon composite material which can be used at high temperatures, a method for producing the same, a novel carbon material joint, a jointing material for a carbon material joint, and a method for producing a carbon joint. A joint 6 of a metal material 4 and a ceramic-carbon composite material 1 is a joint of a metal material 4 made of metal and a ceramic-carbon composite material 1. The ceramic-carbon composite material 1 includes a plurality of carbon particles 2 and a ceramic portion 3 made of ceramic. The ceramic portion 3 is formed among the plurality of carbon particles 2. The metal material 4 and the ceramic-carbon composite material 1 are joined through a joining layer 5. The joining layer 5 contains a carbide of the metal and the ceramic.
    Type: Application
    Filed: May 22, 2012
    Publication date: March 27, 2014
    Applicant: TOYO TANSO CO., LTD.
    Inventors: Tomoyuki Ohkuni, Weiwu Chen, Yoshinari Miyamoto, Tetsuro Tojo
  • Patent number: 8673450
    Abstract: The problem of the present invention is to provide, in high current-low energy type ion implantation apparatuses, a graphite member for a beam line inner member of an ion implantation apparatus, which graphite member can markedly reduce particles incorporated in a wafer surface. This problem can be solved by the graphite member of the present invention, which is a graphite member for a beam line inner member of an ion implantation apparatus, which member having a bulk density of not less than 1.80 Mg/m3 and an electric resistivity of not more than 9.5 ??·m. Preferably, the R value obtained by dividing D band intensity at 1370 cm?1 by G band intensity at 1570 cm?1 in the Raman spectrum of a spontaneous fracture surface of the graphite member is not more than 0.20.
    Type: Grant
    Filed: October 12, 2006
    Date of Patent: March 18, 2014
    Assignee: Toyo Tanso Co., Ltd.
    Inventors: Kiyoshi Saito, Fumiaki Yokoyama, Hitoshi Suzuki, Atsuko Ando, Tetsuro Tojo, Seiji Shinohara
  • Publication number: 20140072792
    Abstract: Provided are a metal-carbon composite material having good workability and a high carbon content and a method for producing the same. The metal-carbon composite material 1 includes a continuous metallic phase 3 and a plurality of carbon particles 2 dispersed in the metallic phase 3. The carbon content in the metal-carbon composite material 1 is 50% or more by volume.
    Type: Application
    Filed: May 10, 2012
    Publication date: March 13, 2014
    Applicant: TOYO TANSO CO., LTD.
    Inventors: Fumishige Nakamura, Weiwu Chen, Yoshinari Miyamoto, Tetsuro Tojo
  • Patent number: 8628748
    Abstract: A purification method for a carbon material containing carbon nanotubes is provided, which satisfies the following requirements: The method should prevent carbon nanotubes from being damaged, broken or flocculated; the method should be capable of removing the catalyst metal and carbon components other than the carbon nanotubes; and the method should be applicable to not only multi-walled carbon nanotubes but also single-walled carbon nanotubes which will undergo significant structural changes when heated to 1400° C. or higher temperatures. The method is characterized by including a carbon material preparation process for preparing a carbon material containing carbon nanotubes by an arc discharge method, using an anode made of a material containing at least carbon and a catalyst metal; and a halogen treatment process for bringing the carbon material into contact with a gas containing a halogen and/or halogen compound.
    Type: Grant
    Filed: March 7, 2008
    Date of Patent: January 14, 2014
    Assignee: Toyo Tanso Co., Ltd.
    Inventors: Yuji Takimoto, Naoto Ohta, Tetsuro Tojo
  • Patent number: 8419908
    Abstract: It is a task of the present invention to provide an electrolytic apparatus for producing fluorine or nitrogen trifluoride by electrolyzing a hydrogen fluoride-containing molten salt, the electrolytic apparatus being advantageous in that the electrolysis can be performed without the occurrence of the anode effect even at a high current density and without the occurrence of an anodic dissolution. In the present invention, this task has been accomplished by an electrolytic apparatus for producing fluorine or nitrogen trifluoride by electrolyzing a hydrogen fluoride-containing molten salt at an applied current density of from 1 to 1,000 A/dm2, the electrolytic apparatus using a conductive diamond-coated electrode as an anode.
    Type: Grant
    Filed: February 14, 2012
    Date of Patent: April 16, 2013
    Assignee: Toyo Tanso Co., Ltd.
    Inventors: Tetsuro Tojo, Jiro Hiraiwa, Hitoshi Takebayashi, Masashi Kodama
  • Patent number: 8419921
    Abstract: It is a task of the present invention to provide an electrolytic apparatus for producing fluorine or nitrogen trifluoride by electrolyzing a hydrogen fluoride-containing molten salt, the electrolytic apparatus being advantageous in that the electrolysis can be performed without the occurrence of the anode effect even at a high current density and without the occurrence of an anodic dissolution. In the present invention, this task has been accomplished by an electrolytic apparatus for producing fluorine or nitrogen trifluoride by electrolyzing a hydrogen fluoride-containing molten salt at an applied current density of from 1 to 1,000 A/dm2, the electrolytic apparatus using a conductive diamond-coated electrode as an anode.
    Type: Grant
    Filed: February 14, 2012
    Date of Patent: April 16, 2013
    Assignee: Toyo Tanso Co., Ltd.
    Inventors: Tetsuro Tojo, Jiro Hiraiwa, Hitoshi Takebayashi, Masashi Kodama
  • Patent number: 8387559
    Abstract: Fluorine gas generators are connected with semiconductor manufacturing apparatuses through a gas supplying system including a storage tank that can store a predetermined quantity of fluorine gas generated in the on-site fluorine gas generators. When one or more of the on-site fluorine gas generators are stopped, fluorine gas is supplied to the semiconductor manufacturing apparatuses from the storage tank storing a predetermined quantity of fluorine gas, so as to keep the operations of the semiconductor manufacturing apparatuses. Thereby obtained is a semiconductor manufacturing plant in which fluorine gas generated in the fluorine gas generators can be safely and stably supplied to the semiconductor manufacturing apparatuses, and with superior cost performance.
    Type: Grant
    Filed: February 7, 2007
    Date of Patent: March 5, 2013
    Assignees: Toyo Tanso Co., Ltd., Tokyo Electron Limited
    Inventors: Jiro Hiraiwa, Osamu Yoshimoto, Hiroshi Hayakawa, Tetsuro Tojo, Tsuneyuki Okabe, Takanobu Asano, Shinichi Wada, Ken Nakao, Hitoshi Kato
  • Patent number: 8366886
    Abstract: A fluorine/fluoride gas generator which has an electrolyte made of mixed molten salt containing hydrogen fluoride in an electrolytic cell including an anode chamber and a cathode chamber, and generates a gas containing fluorine by electrolyzing the electrolyte, includes a raw material supply pipe for supplying an electrolysis raw material, reaching the inside of the electrolyte in the electrolytic cell, a normally-closed valve provided in the middle of the raw material supply pipe, and a bypass pipe provided with a normally-open valve, joining the raw material supply pipe on the downstream side from the normally-closed valve to a gas phase area of the electrolytic cell. Accordingly, the electrolyte is prevented from being suctioned into the raw material supply pipe in the fluorine/fluoride gas generator, and solidification of the electrolyte inside the raw material supply pipe can be prevented.
    Type: Grant
    Filed: June 28, 2006
    Date of Patent: February 5, 2013
    Assignee: Toyo Tanso Co., Ltd.
    Inventors: Noriyuki Tanaka, Osamu Yoshimoto, Jiro Hiraiwa, Hiroshi Hayakawa, Tetsuro Tojo
  • Publication number: 20120164441
    Abstract: Achieved is a ceramic carbon composite material and a ceramic-coated ceramic carbon composite material which are lighter than ceramics and excellent in at least one of properties including oxidation resistance, resistance to dust generation, heat conductivity, electrical conductivity, strength, and denseness. The ceramic carbon composite material is a ceramic carbon composite material in which an interfacial layer of a ceramic is formed between carbon particles of or containing graphite. The ceramic carbon composite material can be produced by forming a green body from ceramic-coated powder in which the surfaces of carbon particles of or containing graphite are coated with individual ceramic layers and sintering the green body.
    Type: Application
    Filed: September 1, 2010
    Publication date: June 28, 2012
    Applicant: TOYO TANSO CO., LTD.
    Inventors: Yoshinari Miyamoto, Weiwu Chen, Masaharu Nakamura, Taihei Matsumoto, Tetsuro Tojo
  • Publication number: 20120156479
    Abstract: Produced is a silicon carbide-coated carbon base material in which a silicon carbide coating is densely and uniformly formed on the surface of a carbon base material, such as graphite. A production process includes the steps of: preparing a carbon base material the surface of which has basal plane sites of an SP2 carbon structure with no dangling bond and edge plane sites of an SP2 carbon structure with a dangling bond; and reacting the surface of the carbon base material with SiO gas in an atmosphere at a temperature of 1400° C. to 1600° C. and a pressure of 1 to 150 Pa to form silicon carbide, whereby the carbon base material coated with silicon carbide is produced.
    Type: Application
    Filed: September 1, 2010
    Publication date: June 21, 2012
    Applicant: TOYO TANSO CO., LTD.
    Inventors: Masaharu Nakamura, Yoshinari Miyamoto, Tetsuro Tojo
  • Publication number: 20120138476
    Abstract: It is a task of the present invention to provide an electrolytic apparatus for producing fluorine or nitrogen trifluoride by electrolyzing a hydrogen fluoride-containing molten salt, the electrolytic apparatus being advantageous in that the electrolysis can be performed without the occurrence of the anode effect even at a high current density and without the occurrence of an anodic dissolution. In the present invention, this task has been accomplished by an electrolytic apparatus for producing fluorine or nitrogen trifluoride by electrolyzing a hydrogen fluoride-containing molten salt at an applied current density of from 1 to 1,000 A/dm2, the electrolytic apparatus using a conductive diamond-coated electrode as an anode.
    Type: Application
    Filed: February 14, 2012
    Publication date: June 7, 2012
    Inventors: Tetsuro TOJO, Jiro Hiraiwa, Hitoshi Takebayashi, Masashi Kodama