Patents by Inventor Ishii Yutaka

Ishii Yutaka 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).

  • Method of making a corrosion resistant aluminum heat exchanger using a particulate flux
    Patent number: 4831701
    Abstract: A method of treating a heat exchanger made of aluminum or an aluminum alloy comprising applying onto the surface of the aluminum heat exchanger a noncorrosive flux having a flux core with an outer coating of zinc or a zinc alloy formed by vacuum vapor deposition or ion plating, and then heating the resulting heat exchanger to effect brazing. A diffused zinc layer forms on the surface of the heat exchanger and protects it from corrosion, in particular, from electrolytic corrosion.
    Type: Grant
    Filed: February 12, 1986
    Date of Patent: May 23, 1989
    Assignee: Sanden Corporation
    Inventor: Ishii Yutaka
  • Matrix liquid-crystal display devices
    Patent number: 4405209
    Abstract: There discloses a matrix liquid-crystal display device which is effective for the display of images particularly in a TV set and in which the liquid-crystal layer contains a dopant in a specific range of quantity which is far greater than a quantity of dopant employed in any known device.
    Type: Grant
    Filed: February 10, 1981
    Date of Patent: September 20, 1983
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Fumiaki Funada, Toshiaki Takamatsu, Ishii Yutaka, Tomio Wada