Patents by Inventor Takeyuki Yokoyama

Takeyuki 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).

  • Polyester film having improved slipperiness
    Patent number: 4348446
    Abstract: A biaxially oriented polyester film containing fine particles of insoluble inert substance, has a kinetic coefficient of friction of not more than 0.3, and has microscopic protrusions integrated thereto, said protrusion having an peak-to-valley height of not more than 1 micron mostly range of 0.2 to 0.5 micron. The film having improved slipperiness is useful as the base film of magnetic recording tape for a video tape recorder or a computer data storage.
    Type: Grant
    Filed: September 4, 1980
    Date of Patent: September 7, 1982
    Assignee: Teijin Limited
    Inventors: Yukio Mitsuishi, Shigeru Shiozaki, Takao Chujo, Takeyuki Yokoyama