Patents by Inventor Hiraki Iwasa

Hiraki Iwasa 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).

  • Run-flat tire
    Patent number: 8851129
    Abstract: Provided is a run-flat tire having a substantially-crescent-shaped cross section, which makes it possible to achieve both durability at the time of run-flat travel and ride comfort at the time of travel at a normal inner pressure. A rigidity reducing portion that reduces a tire rigidity in the width direction extends in the circumferential direction on a surface of a tread rubber in an area located on the inner side than an end of a belt in the tire width direction and on the outer side than a road-contacting end in the tire width direction under a 75% load state.
    Type: Grant
    Filed: May 28, 2010
    Date of Patent: October 7, 2014
    Assignee: Bridgestone Corporation
    Inventors: Keita Yumii, Hiraki Iwasa
  • RUN-FLAT TIRE
    Publication number: 20120067486
    Abstract: Provided is a run-flat tire having a substantially-crescent-shaped cross section, which makes it possible to achieve both durability at the time of run-flat travel and ride comfort at the time of travel at a normal inner pressure. A rigidity reducing portion 20 that reduces a tire rigidity in the width direction extends in the circumferential direction on a surface of a tread rubber 1 in an area located on the inner side than an end 5a of a belt in the tire width direction and on the outer side than a road-contacting end 15 in the tire width direction under a 75% load state.
    Type: Application
    Filed: May 28, 2010
    Publication date: March 22, 2012
    Applicant: BRIDGESTONE CORPORATION
    Inventors: Keita Yumii, Hiraki Iwasa