Patents by Inventor Satoshi Shirai

Satoshi Shirai 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).

  • Racquet with slidable weight
    Patent number: 6623383
    Abstract: A racket comprising a frame body having a face portion, a shaft portion, and a grip portion, and a groove in the length of 10% to 20% against the entire circumference of the frame comprising the face portion provided at two portions covering maximum width points of the frame comprising the face portion and a closed tube enclosing a slidable weight weighing 2 g to 10 g is embedded in the groove.
    Type: Grant
    Filed: February 19, 2002
    Date of Patent: September 23, 2003
    Assignee: Bridgestone Sports Co., Ltd.
    Inventors: Toyotake Matsuoka, Satoshi Shirai
  • Racket
    Publication number: 20020160866
    Abstract: A racket comprising a frame body having a face portion, a shaft portion, and a grip portion, and a groove in the length of 10% to 20% against the entire circumference of the frame comprising the face portion provided at two portions covering maximum width points of the frame comprising the face portion and a closed tube enclosing a slidable weight weighing 2 g to 10 g is embedded in the groove.
    Type: Application
    Filed: February 19, 2002
    Publication date: October 31, 2002
    Applicant: BRIDGESTONE SPORTS CO., LTD.
    Inventors: Toyotake Matsuoka, Satoshi Shirai