Patents by Inventor Yuji Tomatsu

Yuji Tomatsu 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).

  • Patent number: 8146631
    Abstract: Provided are a pneumatic tire, a method of producing the pneumatic tire, and a tire curing mold, with which decrease in wet performance of a pneumatic tire in a worn state can be effectively prevented while chipping of land portions such as blocks is prevented in releasing the tire from a mold. The pneumatic tire of the present invention includes: a tread portion provided with groove portions and land portions; and sipes provided in the land portions. Each of the sipes has at least one end, in a longitudinal direction, being terminated within the corresponding land portion. Each sipe is provided with: a first offset portion protruding toward one side in a sipe thickness direction; and a second offset portion protruding toward the other side in the sipe thickness direction at a position on an inner side, in a tire radial direction, of a position at which the first offset portion protrudes.
    Type: Grant
    Filed: March 30, 2009
    Date of Patent: April 3, 2012
    Assignee: The Yokohama Rubber Co., Ltd.
    Inventor: Yuji Tomatsu
  • Publication number: 20090255616
    Abstract: Provided are a pneumatic tire, a method of producing the pneumatic tire, and a tire curing mold, with which decrease in wet performance of a pneumatic tire in a worn state can be effectively prevented while chipping of land portions such as blocks is prevented in releasing the tire from a mold. The pneumatic tire of the present invention includes: a tread portion provided with groove portions and land portions; and sipes provided in the land portions. Each of the sipes has at least one end, in a longitudinal direction, being terminated within the corresponding land portion. Each sipe is provided with: a first offset portion protruding toward one side in a sipe thickness direction; and a second offset portion protruding toward the other side in the sipe thickness direction at a position on an inner side, in a tire radial direction, of a position at which the first offset portion protrudes.
    Type: Application
    Filed: March 30, 2009
    Publication date: October 15, 2009
    Applicant: THE YOKOHAMA RUBBER CO., LTD.
    Inventor: Yuji Tomatsu
  • Patent number: D502443
    Type: Grant
    Filed: February 25, 2004
    Date of Patent: March 1, 2005
    Assignee: The Yokohama Rubber Co., Ltd.
    Inventors: Izumi Kuramochi, Kenichiro Endo, Hirohisa Hazama, Yuji Tomatsu
  • Patent number: D510903
    Type: Grant
    Filed: February 25, 2004
    Date of Patent: October 25, 2005
    Assignee: The Yokohama Rubber Co., Ltd.
    Inventors: Izumi Kuramochi, Kenichiro Endo, Hirohisa Hazama, Yuji Tomatsu
  • Patent number: D585814
    Type: Grant
    Filed: May 30, 2008
    Date of Patent: February 3, 2009
    Assignee: The Yokohama Rubber Co., Ltd
    Inventors: Yuji Tomatsu, Takumi Morito, Izumi Kuramochi, Yukio Kuroda
  • Patent number: D588521
    Type: Grant
    Filed: May 30, 2008
    Date of Patent: March 17, 2009
    Assignee: The Yokohama Rubber Co., Ltd.
    Inventors: Yuji Tomatsu, Takumi Morito, Izumi Kuramochi, Yukio Kuroda
  • Patent number: D598364
    Type: Grant
    Filed: May 30, 2008
    Date of Patent: August 18, 2009
    Assignee: The Yokohama Rubber Co., Ltd
    Inventors: Yuji Tomatsu, Takumi Morito, Izumi Kuramochi, Yukio Kuroda
  • Patent number: D601944
    Type: Grant
    Filed: May 30, 2008
    Date of Patent: October 13, 2009
    Assignee: The Yokohama Rubber Co., Ltd.
    Inventors: Yuji Tomatsu, Takumi Morito, Izumi Kuramochi, Yukio Kuroda