Patents by Inventor Toyomi Iwata

Toyomi Iwata 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).

  • Precure tread for retread tire
    Patent number: 5603366
    Abstract: A precure tread for a tire has surface grooves facing a tread face, rear grooves facing a crown portion of a base tire, and a passage for communication between the rear grooves to atmosphere. The groove bottom of the rear grooves is located at a higher level than a groove bottom of the surface groove in the radial direction. The tire durability can be considerably improved when this precure tread is applied to a new tire or a retreaded tire.
    Type: Grant
    Filed: March 21, 1995
    Date of Patent: February 18, 1997
    Assignee: Bridgestone Corporation
    Inventors: Shohachiro Nakayama, Toyomi Iwata, Masahiro Kuroda, Naoyuki Goto, Hiroshi Ueda, Michio Ishii
  • Precure tread for tire including surface and rear grooves
    Patent number: 5445691
    Abstract: A precure tread for a tire has surface grooves facing a tread face, rear grooves facing a crown portion of a base tire, and a passage for communication between the grooves to atmosphere. The groove bottom of the rear grooves is located at a high level than a groove bottom of the surface groove in the radial direction. The tire durability can be considerably improved when this precure tread is applied to a new tire or a retreated tire.
    Type: Grant
    Filed: September 14, 1993
    Date of Patent: August 29, 1995
    Assignee: Bridgestone Corporation
    Inventors: Shohachiro Nakayama, Toyomi Iwata, Masahiro Kuroda, Naoyuki Goto, Hiroshi Ueda, Michio Ishii
  • Precure tread for a new tire, and retread tires
    Patent number: 5275218
    Abstract: A precure tread for a tire has surface grooves facing a tread face, rear grooves facing a crown portion of a base tire, and a passage for communication between the rear grooves to atmosphere. The groove bottom of the rear grooves is located at a higher level than a groove bottom of the surface groove in the radial direction. The tire durability can be considerably improved when this precure tread is applied to a new tire or a retread tire.
    Type: Grant
    Filed: March 28, 1989
    Date of Patent: January 4, 1994
    Assignee: Bridgestone Corporation
    Inventors: Shohachiro Nakayama, Toyomi Iwata, Masahiro Kuroda, Naoyuki Goto, Hiroshi Ueda, Michio Ishii
  • Pneumatic tire for airplanes
    Patent number: 4044810
    Abstract: A pneumatic tire for airplanes which can reduce a ratio of the load subjected to a tread center zone of the tire to the load subjected to two shoulder zones thereof and improve a high speed durability of the tire without sacrificing a wear resistance thereof is disclosed. The tire comprises a pair of circumferentially extending grooves each arranged at a shoulder portion of the tire and substantially symmetrically and equally spaced apart from a crown center of the tire. A distance between the circumferentially extending grooves is from 50% to 95%, preferably 55% to 80% of a tread width and serves to divide a tread portion of the tire into a center zone and two shoulder zones. The outer surfaces of the shoulder zones are protruded from the circumferentially extending grooves toward the outside thereof by a step having a level difference from 0.5 mm to 6 mm.
    Type: Grant
    Filed: October 2, 1975
    Date of Patent: August 30, 1977
    Assignee: Bridgestone Tire Company Limited
    Inventors: Motoaki Taniguchi, Toyomi Iwata
  • Automobile tire
    Patent number: D313384
    Type: Grant
    Filed: May 2, 1988
    Date of Patent: January 1, 1991
    Assignee: Bridgestone Corporation
    Inventors: Toru Tsuda, Toyomi Iwata