Patents by Inventor Koshi Yokoyama

Koshi 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).

  • Pipe made of polyethylene resin
    Patent number: 6204349
    Abstract: A pipe made of a polyethylene resin which is a linear polyethylene having the following physical properties (1) to (4): (1) a melt flow rate of 0.02 to 0.2 g/10 min, (2) a flow ratio of 50 or more, (3) a density of 0.945 to 0.960 g/cm3, and (4) a relaxation parameter H, represented by the following equation (I), of 2.
    Type: Grant
    Filed: June 21, 1996
    Date of Patent: March 20, 2001
    Assignee: Mitsubishi Chemical Corporation
    Inventors: Yoshinao Shinohara, Yasuhisa Mizuno, Eiji Tanaka, Yasuhiro Kashiwagi, Miki Suzaki, Koshi Yokoyama