Patents by Inventor Keiji Asatsuma

Keiji Asatsuma 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).

  • Method for manufacturing carbide for reinforcing rubber articles
    Patent number: 9358549
    Abstract: Disclosed is a method for manufacturing a carbide for reinforcing rubber articles that is capable of effectively utilizing polymer waste. The method includes the steps of mixing a carbide, obtained by thermal decomposition or incomplete combustion of polymer waste and pulverized by grinding, with carbon black to obtain a mixture of the carbide and the carbon black, and granulating the mixture using a granulating machine at a rotation speed of 70 rpm to 130 rpm.
    Type: Grant
    Filed: April 16, 2012
    Date of Patent: June 7, 2016
    Assignee: BRIDGESTONE CORPORATION
    Inventors: Masanori Kawamura, Keiji Asatsuma
  • METHOD FOR MANUFACTURING CARBIDE FOR REINFORCING RUBBER ARTICLES
    Publication number: 20140001293
    Abstract: Disclosed is a method for manufacturing a carbide for reinforcing rubber articles that is capable of effectively utilizing polymer waste. The method includes the steps of mixing a carbide, obtained by thermal decomposition or incomplete combustion of polymer waste and pulverized by grinding, with carbon black to obtain a mixture of the carbide and the carbon black, and granulating the mixture using a granulating machine at a rotation speed of 70 rpm to 130 rpm.
    Type: Application
    Filed: April 16, 2012
    Publication date: January 2, 2014
    Applicant: BRIDGESTONE CORPORATION
    Inventors: Masanori Kawamura, Keiji Asatsuma
  • Pneumatic tires
    Patent number: 5187223
    Abstract: In a pneumatic tire, a tread portion is comprised of a rubber composition containing 30-70 parts by weight of carbon black powder having particular properties based on 100 parts by weight of rubber component.
    Type: Grant
    Filed: December 27, 1990
    Date of Patent: February 16, 1993
    Assignee: Asahi Carbon Co., Ltd.
    Inventors: Keiji Asatsuma, Yasuhito Inoue, Akitoshi Kondo