Patents by Inventor Motoaki Ishizuka

Motoaki Ishizuka 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).

  • Shaft and head for golf club
    Patent number: 5885169
    Abstract: Disclosed is a golf club shaft ensuring improved durability and stability in direction in which a golf ball travels, irrespective of the intensity of a golfer's force.The diameter of a main pipe (3) is enlarged over the entire length thereof to such an extent as to allow a suppression of flexure at the time of a swing. From a head side end (4) to a grip side end (5), the main pipe (3) is configured to be tapered or straight within a range of 0/1000 to 5/1000. The main pipe (3) is fashioned into a reversely tapered golf club shaft (1), a straight golf club shaft (11) or a positively tapered golf club shaft (21).
    Type: Grant
    Filed: April 17, 1997
    Date of Patent: March 23, 1999
    Assignee: Tokyo Koushin Co., Ltd.
    Inventor: Motoaki Ishizuka