Patents by Inventor Yutaro Etizen

Yutaro Etizen 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).

  • Process for the corrosion protection of neodymium-iron-boron group sintered magnets
    Patent number: 4917778
    Abstract: Disclosed is a process for the corrosion protection of a neodymium-iron-boron group sintered magnet, which comprises the steps of: immersing the neodymium-iron-boron group sintered magnet in oxidizing acid to activate the surface thereof; plating the magnet with nickel having internal stress of not more than 1000 kgf/cm.sup.2 ; and applying cationic electrodeposition coating thereto.
    Type: Grant
    Filed: October 19, 1989
    Date of Patent: April 17, 1990
    Assignee: Yugen Kaisha Johoku Riken Kogyo
    Inventors: Koji Takada, Yutaro Etizen