Patents by Inventor Hideo Dobashi

Hideo Dobashi 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).

  • Magnetic recording medium
    Patent number: 4756962
    Abstract: A magnetic recording medium, comprising a plastic base coated with a magnetic layer of a ferromagnetic powder dispersed in a resin binder, contains in the magnetic layer .alpha.-Al.sub.2 O.sub.3 particles with an average particle size of 0.1 to 0.3 .mu.m as determined by electron microscopy in an amount of more than 0.5% but less than 15% by weight on the basis of the ferromagnetic powder weight. The .alpha.-Al.sub.2 O.sub.3 particles have an .alpha.-transformation rate of at least 50%. The powder is produced by an organic alumina process.
    Type: Grant
    Filed: April 22, 1987
    Date of Patent: July 12, 1988
    Assignee: TDK Corporation
    Inventors: Shigeru Takamatsu, Hideo Dobashi, Hitoshi Azegami