Patents by Inventor Etsuo Yanagisawa

Etsuo Yanagisawa 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).

  • Non-magnetic part in magnetic head assembly
    Patent number: 4667259
    Abstract: A non-magnetic part bonded to a magnetic core portion made of Ni-Zn ferrite in a magnetic head assembly which is made of a ceramic material comprised of 30 to 50 volume % of TiO.sub.2 and 70 to 50 volume % of Ba.sub.2 Ti.sub.9 O.sub.20 and BaAl.sub.2 Ti.sub.5 O.sub.14 wherein the volume ratio of Ba.sub.2 Ti.sub.9 O.sub.20 to the total volume of Ba.sub.2 Ti.sub.9 O.sub.20 and BaAl.sub.2 Ti.sub.5 O.sub.14 is 0.05 to 0.5.
    Type: Grant
    Filed: April 18, 1985
    Date of Patent: May 19, 1987
    Assignee: Hitachi Metals, Ltd.
    Inventors: Noriaki Uchida, Makoto Ushijima, Etsuo Yanagisawa