Patents by Inventor Tsutomu Katamoto

Tsutomu Katamoto 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).

  • Plate-like hematite particles, a pigment comprising the same and showing a golden color, and a process for producing the same
    Patent number: 5133805
    Abstract: Disclosed herein are plate-like hematite particles having an average particle diameter of 0.5 to 5.0 .mu.m, a lamellar thickness of 50 to 500.ANG. and a plate ratio (the ratio of the average particle diameter to the lamellar thickness) of 50:1 to 500:1, an iron oxide pigment showing a golden color and comprising the plate-like hematite particles, and a process for producing the plate-like hematite particles.
    Type: Grant
    Filed: November 9, 1990
    Date of Patent: July 28, 1992
    Assignee: Toda Kogyo Corp.
    Inventors: Tokihiro Kurata, Tsutomu Katamoto, Nanao Hiriishi, Masao Kiyama
  • Coating composition
    Patent number: 5112403
    Abstract: Disclosed herein is a coating composition comprising plate-like iron oxide particles having an average particle diameter of 0.5 to 5.0 .mu.m, a lamellar thickness of 50 to 500.ANG. and a plate ratio (the ratio of the average particle diameter to the lamellar thickness) of 50:1 to 500:1, at least one pigment selected from the group consisting of a coloring pigment, a mica pigment and a metal powder pigment, a film-forming polymer, and an organic solvent.
    Type: Grant
    Filed: September 11, 1991
    Date of Patent: May 12, 1992
    Assignees: Toda Kogyo Corp., Dainic Iseika Color & Chemicals Mfg. Co. Ltd
    Inventors: Ken Okura, Satoru Matsuzaki, Tsutomu Katamoto, Nanao Horiishi
  • Non-magnetic pigments
    Patent number: 5009712
    Abstract: Disclosed herein is a non-magnetic pigment comprising plate-like potassium ferrite particles having an average diameter of 0.03-30.0 .mu.m and a process for producing the same.
    Type: Grant
    Filed: December 14, 1989
    Date of Patent: April 23, 1991
    Assignee: Toda Kogyo Corp.
    Inventors: Kousaku Tamari, Tsutomu Katamoto
  • Electroconductive iron oxide particles
    Patent number: 4917952
    Abstract: Disclosed herein are electroconductive iron oxide particles having a volume resistivity less than 5.times.10.sup.6 .OMEGA.-cm, and comprising iron oxide particles selected from hematite and maghemite, and SnO.sub.2 particles containing Sb as a solid solution deposited on the surfaces of the iron oxide particles, and a process for producing the same.
    Type: Grant
    Filed: September 26, 1988
    Date of Patent: April 17, 1990
    Assignee: Toda Kogyo Corp.
    Inventors: Tsutomu Katamoto, Tokihiro Kurata, Nanao Horiishi
  • Plate-like magnetoplumbite ferrite particles for magnetic recording and process for producing the same
    Patent number: 4781981
    Abstract: Disclosed herein are Ba-containing plate-like magnetoplumbite type ferrite particles for magnetic recording containing ions of one metal (II) selected from Ni and Zn and ions of one metal (IV) selected from Ti, Sn and Zr, and having zinc incorporated as a solid solution close to the particle surface and the change of coercive force of said particles at a temperature of -20.degree. to 120.degree. C. in the range of -0.5 to +0.5 Oe/.degree.C., and a process for producing the same.
    Type: Grant
    Filed: December 7, 1987
    Date of Patent: November 1, 1988
    Assignee: Toda Kogyo Corp.
    Inventors: Tsutomu Katamoto, Norimichi Nagai, Yasutaka Ota, Katsunori Fujimoto, Akihiko Hirayama, Masao Kiyama