Patents by Inventor Shigeki Kawamura

Shigeki Kawamura 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: 11235310
    Abstract: Provided is a method for manufacturing a catalyst with which it is possible to obtain a supported metal ammonia synthesis catalyst, in which there are restrictions in terms of producing method and producing facility, and particularly large restrictions for industrial-scale producing, in a more simple manner and so that the obtained catalyst has a high activity. This method for manufacturing an ammonia synthesis catalyst includes: a first step for preparing 12CaO.7Al2O3 having a specific surface area of 5 m2/g or above; a second step for supporting a ruthenium compound on the 12CaO.7Al2O3; and a third step for performing a reduction process on the 12CaO.7Al2O3 supporting the ruthenium compound, obtained in the second step. This invention is characterized in that the reduction process is performed until the average particle diameter of the ruthenium after the reduction process has increased by at least 15% in relation to the average particle diameter of the ruthenium before the reduction process.
    Type: Grant
    Filed: August 8, 2017
    Date of Patent: February 1, 2022
    Assignees: Tokyo Institute of Technology, Tsubame BHB Co., Ltd.
    Inventors: Hideo Hosono, Masaaki Kitano, Toshiharu Yokoyama, Jiang Li, Shigeki Kawamura, Kazuhisa Kishida
  • Publication number: 20210016254
    Abstract: Provided is a method for manufacturing a catalyst with which it is possible to obtain a supported metal ammonia synthesis catalyst, in which there are restrictions in terms of producing method and producing facility, and particularly large restrictions for industrial-scale producing, in a more simple manner and so that the obtained catalyst has a high activity. This method for manufacturing an ammonia synthesis catalyst includes: a first step for preparing 12CaO.7Al2O3 having a specific surface area of 5 m2/g or above; a second step for supporting a ruthenium compound on the 12CaO.7Al2O3; and a third step for performing a reduction process on the 12CaO.7Al2O3 supporting the ruthenium compound, obtained in the second step. This invention is characterized in that the reduction process is performed until the average particle diameter of the ruthenium after the reduction process has increased by at least 15% in relation to the average particle diameter of the ruthenium before the reduction process.
    Type: Application
    Filed: October 1, 2020
    Publication date: January 21, 2021
    Applicants: Tokyo Institute of Technology, Tsubame BHB Co., Ltd.
    Inventors: Hideo Hosono, Masaaki Kitano, Toshiharu Yokoyama, Jiang Li, Shigeki Kawamura, Kazuhisa Kishida
  • Publication number: 20190210008
    Abstract: Provided is a method for manufacturing a catalyst with which it is possible to obtain a supported metal ammonia synthesis catalyst, in which there are restrictions in terms of producing method and producing facility, and particularly large restrictions for industrial-scale producing, in a more simple manner and so that the obtained catalyst has a high activity. This method for manufacturing an ammonia synthesis catalyst includes: a first step for preparing 12CaO.7Al2O3 having a specific surface area of 5 m2/g or above; a second step for supporting a ruthenium compound on the 12CaO.7Al2O3; and a third step for performing a reduction process on the 12CaO.7Al2O3 supporting the ruthenium compound, obtained in the second step. This invention is characterized in that the reduction process is performed until the average particle diameter of the ruthenium after the reduction process has increased by at least 15% in relation to the average particle diameter of the ruthenium before the reduction process.
    Type: Application
    Filed: August 8, 2017
    Publication date: July 11, 2019
    Applicants: Tokyo Institute of Technology, Tsubame BHB Co., Ltd.
    Inventors: Hideo Hosono, Masaaki Kitano, Toshiharu Yokoyama, Jiang Li, Shigeki Kawamura, Kazuhisa Kishida
  • Patent number: 6306526
    Abstract: A metal lid for use in hermetic sealing of a semiconductor package comprises a lid body comprising a metal plate having a solder layer secured to the entire surface of the metal lid by cladding. The lid is placed in position on a substrate and can seal the resulting package by heating to melt the solder layer. The lid can be readily mass-produced and can seal the package with high seal reliability and without deposition of solder balls on the inner wall of the package.
    Type: Grant
    Filed: September 10, 1999
    Date of Patent: October 23, 2001
    Assignees: Sumitomo Metal (SMI) Electronics Devices Inc., Senju Metal Industry Co. Ltd.
    Inventors: Tetsuya Yamamoto, Shigeki Kawamura, Sanae Taniguchi