Patents by Inventor Toda Masayuki

Toda Masayuki 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 solution and cleaning method
    Patent number: 5985811
    Abstract: A cleaning solution and cleaning method are provided which: (1) make treatment at room temperature possible, and do not require heating, (2) use little chemicals and water, (3) do not require specialized apparatuses, and moreover, (4) do not require the use of specialized chemicals. The cleaning solution of the present invention comprises pure water containing 20 ppb-100 ppb of oxygen and 2 ppb or more of nitrogen. Furthermore, the cleaning solution may comprise electrolytically ionized water containing OH.sup.- and containing 20 ppb-100 ppb of oxygen. In the cleaning method of the present invention, the cleaning of a material to be cleaned is conducted in a cleaning solution comprising pure water containing 20 ppb-100 ppb of oxygen and 2 ppb-15 ppm of nitrogen, while applying ultrasound having a frequency of 30 kHz or more.
    Type: Grant
    Filed: January 8, 1997
    Date of Patent: November 16, 1999
    Assignees: Tadhiro Ohmi, Pre-Tech Co., Ltd., Kabushiki Kaisha Ultraclean Technology Research Institute
    Inventors: Toda Masayuki, Tadahiro Ohmi, Yasuyuki Harada