Patents by Inventor Yoshitaka Yoshinaga

Yoshitaka Yoshinaga 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).

  • Spindle-like magnetic iron oxide particles and process for producing the same
    Patent number: 4873010
    Abstract: Disclosed herein are magnetic iron oxide particles comprising spindle-like magnetite or maghemite particles having an aspect ratio(major:minor) of less than 4:1 and containing 0.1 to 20 atomic % of Si to Fe, and a process for producing the same.
    Type: Grant
    Filed: April 15, 1987
    Date of Patent: October 10, 1989
    Assignee: Toda Kogyo Corp.
    Inventors: Atsushi Takedoi, Hiroyuki Kondo, Masaru Isoai, Yoshitaka Yoshinaga, Tosiharu Harada, Yosiro Okuda, Hiroshi Sumita, Hirofumi Kawasaki, Kohji Mori
  • Spindle ferromagnetic alloy particles
    Patent number: 4773931
    Abstract: Disclosed herein is spindle ferromagnetic alloy particles having the aspect ratio (major:minor) of less than 3:1 and the coercive force of 500 to 100 Oe, and containing 0.1 to 13 atomic % of Si to Fe, and a process for producing the same.
    Type: Grant
    Filed: January 23, 1987
    Date of Patent: September 27, 1988
    Assignee: Toda Kogyo Corp.
    Inventors: Akio Mishima, Yosiro Okuda, Hiroshi Sumita, Yoshitaka Yoshinaga, Akira Mukaizaka, Tokihiro Kurata