Patents by Inventor Hirotake Yamagishi

Hirotake Yamagishi 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).

  • Positive displacement type liquid-delivery apparatus
    Patent number: 6419462
    Abstract: A positive displacement liquid-delivery apparatus includes a positive displacement pump 110 and a differential pressure control unit 142. The positive displacement pump 110 includes a liquid-delivery chamber 128 having a watertight housing 122 with one part formed of a flexible diaphragm 124, and a diaphragm driver 136 linked to the diaphragm 124 for deforming the same to discharge fluid from the liquid-delivery chamber 128. The differential pressure control unit 142 uniformly controls the differential pressure inside and outside the diaphragm 124 during the pumping process.
    Type: Grant
    Filed: July 28, 2000
    Date of Patent: July 16, 2002
    Assignee: Ebara Corporation
    Inventors: Kuniaki Horie, Yukio Fukunaga, Akihisa Hongo, Kiwamu Tsukamoto, Kenji Kamoda, Hirotake Yamagishi, Shinya Uemura