Patents by Inventor Reiji Yoshizumi

Reiji Yoshizumi 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).

  • Abrasive material for the needle point of a probe card
    Patent number: 6306187
    Abstract: An abrasive material for the needle point of a probe card which can effectively remove foreign matter adhering to the needle point of the probe, protect the needle point from damage and deformation, and prolong the life of the probe. The abrasive material for the needle point of a probe card comprises an abrasive layer including a layer of micropowdered abrasive grains applied to a substrate and a cushion layer having a buffer action and elasticity.
    Type: Grant
    Filed: October 5, 1999
    Date of Patent: October 23, 2001
    Assignees: 3M Innovative Properties Company, NEC Corporation
    Inventors: Toshiro Maeda, Naoya Kamata, Kazuo Tanaka, Reiji Yoshizumi