Patents by Inventor Toshiki Sawada

Toshiki Sawada 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: 20220211899
    Abstract: The present invention provides a biocompatible material improved in biocompatibility owing to adsorption of a peptide that has high adhesion with a resin and hardly separates from a surface of the resin, and a functional material including the biocompatible material. The biocompatible material includes a resin and a peptide adsorbed on the resin. The resin has methoxycarbonyl groups and methyl groups, and tryptophan or arginine accounts for 70% or more of amino acid residues in the peptide. As an alternative, the resin is a fluorinated resin, and 2,3,4,5,6-pentafluoro-phenylalanine, 3-(trifluoromethyl)alanine, serine, threonine, histidine, aspartic acid, glutamic acid, phenylalanine, or aspartic acid accounts for 40% or more of the amino acid residues in the peptide. The functional material includes the biocompatible material, and a functional substance. The functional substance is held on a surface of the biocompatible material or is released from the surface of the biocompatible material.
    Type: Application
    Filed: March 3, 2020
    Publication date: July 7, 2022
    Inventors: Tomio IWASAKI, Masashi MARUYAMA, Takeshi SERIZAWA, Toshiki SAWADA
  • Publication number: 20220049237
    Abstract: This invention provides a novel carrier for enzyme immobilization and an immobilized enzyme. The carrier for enzyme immobilization according to an embodiment comprises a porous material and cellulose that has an amino group-containing substituent at an anomeric position and is immobilized on the porous material. The immobilized enzyme contains the carrier for enzyme immobilization and an enzyme immobilization on the cellulose. The carrier for enzyme immobilization is obtained by adding an acid to an aqueous solution in which cellulose having an amino group-containing substituent at an anomeric position is dissolved in an aqueous alkaline solution to deposit the cellulose in the presence of a porous material. The immobilized enzyme is obtained by immobilizing an enzyme on the cellulose.
    Type: Application
    Filed: October 17, 2019
    Publication date: February 17, 2022
    Applicants: TOKYO INSTITUTE OF TECHNOLOGY, DKS Co. Ltd.
    Inventors: Takeshi SERIZAWA, Toshiki SAWADA, Masahito NISHIURA
  • Publication number: 20210238641
    Abstract: A method for producing a cellooligosaccharide that enables the formation of a cellooligosaccharide having a high degree of polymerization to be suppressed in enzymatic synthesis of a cellooligosaccharide, the method comprising reacting ?-glucose-1-phosphate and at least one primer selected from the group consisting of glucose, cellobiose, and alkylated glucose with cellodextrin phosphorylase in a mixed solvent containing water and a water-soluble organic solvent.
    Type: Application
    Filed: April 11, 2019
    Publication date: August 5, 2021
    Applicants: DAI-ICHI KOGYO SEIYAKU CO., LTD., TOKYO INSTITUTE OF TECHNOLOGY
    Inventors: Takeshi SERIZAWA, Toshiki SAWADA, Masahito NISHIURA
  • Patent number: 5849165
    Abstract: Oxygen sensor element (ZrO.sub.2 solid electrolyte etc) for detecting oxygen concentration in an exhaust gas has a protective layer which is made of a heat-resistant metal oxide and which carries a component of a IIa subgroup element (Ca, Mg etc) on the side exposed to the exhaust gas of the sensor element, at least a part of the protective layer being present as a nonstoichiometric compound (Ti oxide etc) with respect to the heat-resistant metal oxide. Si-poisoning is prevented. Heater for heating the sensor element is provided for preventing Si-poisoning at low temperatures.
    Type: Grant
    Filed: March 21, 1995
    Date of Patent: December 15, 1998
    Assignee: NGK Spark Plug Co. Ltd.
    Inventors: Takao Kojima, Hiroyuki Ishiguro, Masaru Yamano, Toshiki Sawada, Kazuo Taguchi, Masahiko Yamada, Noriaki Kondo
  • Patent number: 5443711
    Abstract: Oxygen-sensor element comprises reference-gas-side and detection-gas-side electrodes on both surfaces of a solid-electrolyte body, and a porous protective layer on the surface of the detection-gas-side electrode, wherein at least a part (including at least a surface layer) of said porous protective layer is formed by a granular texture of a grain size of 0.1 to 0.5 .mu.m formed mainly of a nonstoichiometric compound of a transition metal oxide (TiO.sub.x), and a catalyst for having gas components of the gas to be measured react is carried in at least a part (including at least a surface layer) of the porous protective layer. Oxidation reaction of gas components is improved to prevent deterioration of the responsive property.
    Type: Grant
    Filed: December 22, 1992
    Date of Patent: August 22, 1995
    Assignee: NGK Spark Plug Co., Ltd.
    Inventors: Takao Kojima, Hiroyuki Ishiguro, Masaru Yamano, Noriaki Kondo, Masahiko Yamada, Toshiki Sawada
  • Patent number: 5326597
    Abstract: Oxygen sensor for air-fuel ratio control is provided with a sensor element having an oxygen ion-conductive main body and electrodes on both sides thereof, and at least one porous protective layer covering the electrode on the exhaust gas side. The protective layer includes an oxygen storage component OSC without copresence of a noble metal catalyst. The protective layer is intermeshingly connected to the main body via spherical protrusions of the main body. Double-layered protective layer structure includes OSC noncontaining layer (optionally containing catalyst) and OSC containing layer, as inner and outer protective layer or vice versa. OSC containing layer is formed by impregnation with OSC-solution through immersing the respective porous protective layer, or by cosintering the OSC containing green coating layer. By impregnation 0.2-8 wt %, or by cosintering 0.2-30 wt %, of OSC metal element is containable. The outer protective layer is thinner and more porous than the inner protective layer.
    Type: Grant
    Filed: February 25, 1992
    Date of Patent: July 5, 1994
    Assignee: NGK Spark Plug Co., Ltd.
    Inventors: Toshiki Sawada, Masaru Yamano, Kazuo Taguchi, Takao Kojima, Hiroyuki Ishiguro, Masahiko Yamada
  • Patent number: 5160598
    Abstract: Oxygen sensor for air-fuel ratio control is provided with a sensor element having an oxygen ion-conductive main body and electrodes on both sides thereof, and at least one porous protective layer covering the electrode on the exhaust gas side. The protective layer includes an oxygen storage component OSC without copresence of a noble metal catalyst. The protective layer is intermeshingly connected to the main body via spherical protrusions of the main body. Double-layered protective layer structure includes OSC noncontaining layer (optionally containing catalyst) and OSC containing layer, as inner and outer protective layer or vice versa. OSC containing layer is formed by impregnation with OSC-solution through immersing the respective porous protective layer, or by cosintering the OSC containing green coating layer. By impregnation 0.2 -8 wt %, or by cosintering 0.2-30 wt %, of OSC metal element is containable. The outer protective layer is thinner and more porous than the inner protective layer.
    Type: Grant
    Filed: February 14, 1990
    Date of Patent: November 3, 1992
    Assignee: NGK Spark Plug Co., Ltd.
    Inventors: Toshiki Sawada, Masaru Yamano, Kazuo Taguchi, Takao Kojima, Hiroyuki Ishiguro, Masahiko Yamada
  • Patent number: 5020499
    Abstract: This invention provides apparatus for detecting abnormality of an oxygen sensor accurately and also apparatus for appropriately controlling the air/fuel ratio of air and fuel mixture when an oxygen sensor is abnormal. The apparatus easily and properly detects a deteriorating oxygen sensor, with the use of which exhaust of nitrogen oxides or carbon monoxide increases, and when the oxygen sensor is determined to deteriorate, the feed back control of the air/fuel ratio of air and fuel mixture supplied to an internal combustion engine is preferably performed.
    Type: Grant
    Filed: June 18, 1990
    Date of Patent: June 4, 1991
    Assignee: NGK Spark Plug Co., Ltd.
    Inventors: Takao Kojima, Masaru Yamano, Toshiki Sawada
  • Patent number: 4884066
    Abstract: Deterioration detector system for catalyst in use for emission gas purifier, comprising; an emission passageway through which exhaust gas from internal combustion engine, passes by way of catalyst to facilitate the reducing and oxidizing reaction among the toxicant component of hydrocarbon, carbon monoxide and nitrogen oxide; a sensor placed at the emission passageway to position downstream of the catalyst against the exhaust gas flow so as to generate an output in direct proportion to air-fuel ratio in the exhaust gas; an annunciator arranged to activate in response to the output of more than the predetermined level generated from the air- fuel ratio sensor.
    Type: Grant
    Filed: November 17, 1987
    Date of Patent: November 28, 1989
    Assignee: NGK Spark Plug Co., Ltd.
    Inventors: Shigeru Miyata, Toshiki Sawada