Patents by Inventor Takeshi Dohku

Takeshi Dohku 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).

  • Cleaning method and cleaning apparatus
    Patent number: 5501240
    Abstract: The invention provides a cleaning method comprising:a step of immersing the object of cleaning first in a first tank to wash roughly by bubbling from beneath, and showering with purified water from above when lifting the object,a step of immersing the object coming from the first tank in a second tank to wash preliminarily with ultrasonic waves, and showering with purified water from above when lifting the object,a step of immersing the object coming from the first tank or second tank successively in a third tank to wash thoroughly with ultrasonic waves and water jet, and showering with purified water from above when lifting the object, anda step of immersing the object coming from the third tank finally into a fourth tank to finish with water jet, and lifting.
    Type: Grant
    Filed: October 3, 1994
    Date of Patent: March 26, 1996
    Assignee: Hitachi Zosen Corporation
    Inventors: Takeshi Dohku, Kazuo Yoshida, Kazunori Koba, Kazuyuki Miyake