Patents by Inventor Fumito Ishii

Fumito Ishii 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).

  • Pneumatic tire with varying angle lug grooves
    Patent number: 5365987
    Abstract: A pneumatic tire of the type wherein a plurality main grooves extending in a tire circumferential direction are so disposed on a tread surface as to define a plurality of rib lines and a plurality of lug grooves are so disposed in said rib lines as to define a plurality of blocks, characterized in that lug groove angles in each of the rib lines to the tire circumferential direction are changed within a range of a maximum-to-minimum ratio of 1.1 to 1.4 as a repeating unit of a geometric progression, and the lug groove angles in the rib lines positioned on the shoulder side to the tire circumferential direction are set to be greater than the lug groove angles in the rib lines positioned on the center side to the tire circumferential direction.
    Type: Grant
    Filed: October 19, 1992
    Date of Patent: November 22, 1994
    Assignee: The Yokohama Rubber Co., Ltd.
    Inventors: Fumito Ishii, Kenichiro Sugitani, Kunihiko Kakigi