Patents by Inventor Yoshinaga Nakai

Yoshinaga Nakai 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).

  • Electromagnetic wave shield magnet, method for making the magnet, and electromagnetic wave shield article
    Patent number: 6231703
    Abstract: The electromagnetic wave shield magnet is used on conductive articles such as eyeglasses and earrings to block or reduce the effect of stray electromagnetic waves on the user. Additionally, the article can have a conductive coating and an insulating coating to increase the reduction of the stray electromagnetic waves. The magnet is made by treating a base magnet with an alkali aqueous solution which contains chitosan. The article can also be made with just the conductive coating or with the conductive coating and the insulating coating.
    Type: Grant
    Filed: March 18, 1998
    Date of Patent: May 15, 2001
    Inventor: Yoshinaga Nakai
  • Sports implements with a long handle or portion
    Patent number: 5042805
    Abstract: A golf club includes a grip, shaft, and head. Within the shaft is disposed a spiral groove in which is disposed a coiled spring formed of a shape-memorizing alloy. Epoxy resin fills the groove and overlies the spring. The spring increases the strength of the shaft.
    Type: Grant
    Filed: January 3, 1990
    Date of Patent: August 27, 1991
    Assignee: Nisso Ltd.
    Inventor: Yoshinaga Nakai