Patents by Inventor Shinzi Ohtani

Shinzi Ohtani 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 for impregnating a die-cast article with a sealant and an impregnation apparatus therefor
    Patent number: 4520045
    Abstract: In a conventional method of impregnating die-cast articles, the sealing property is not excellent due to air being dragged into the sealant.In the present invention, the dragging of air into the sealant is prevented by adjusting the pressure of the sealant storage vessel and the pressure of the impregnation vessel to substantially the same level and then flowing the sealant from the sealant storage vessel into the impregnation vessel. After impregnation, the sealant reenters the sealant storage vessel, and pressure is applied to the die-cast articles so as to remove excessive sealant from them.
    Type: Grant
    Filed: December 20, 1983
    Date of Patent: May 28, 1985
    Assignees: Taiho Kogyo Co., Ltd., Yugenkaisha Hakusui Sangyo
    Inventors: Tomoharu Kutsuna, Shinzi Ohtani, Kunimasa Kondo