Patents by Inventor Takao Toshiaki

Takao Toshiaki 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).

  • Second pressure ring for Al cylinders and its producing method
    Patent number: 6206379
    Abstract: The present invention is for producing stably a second pressure ring which both keeps a lubricant-scraping property and prevents the cylinder side from being longitudinally scratched. According to the invention, a second pressure ring made of iron without plating thereon, of which the outer peripheral sliding surface is downwardly divergent and slanted, is provided in which the lower end of the outer peripheral sliding surface is worked upwardly divergently so as to slant in a range of less than 0.15 mm in its axial direction. The junction between the outer peripheral sliding surface and the slanted worked portion is lapped cylindrically for finishing.
    Type: Grant
    Filed: March 9, 1998
    Date of Patent: March 27, 2001
    Assignee: Nippon Piston Ring Co., Ltd.
    Inventor: Takao Toshiaki