Patents by Inventor Akira Furujo

Akira Furujo 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).

  • Plasma processing apparatus and method
    Patent number: 4803405
    Abstract: The present invention relates to a plasma processing apparatus capable of obtaining a satisfactory plasma arc and a processing method used by this plasma processing apparatus.The plasma processing apparatus is constructed to vary an electric current or a voltage during start up at a fixed period for a fixed time. The plasma processing apparatus has a plasma power source capable of controlling an electric current or a voltage applied to a plasma torch, and an electrode and a nozzle are communicated by means of an electrification in the plasma torch.In a method for performing a plasma process by a plasma processing apparatus, a mixing gas has a ratio of Hydrogen to Argon in a range from 5 to 20 Vol %, and a frequency of a plasma electric current is controlled in a range from 10 to 30 KHz.
    Type: Grant
    Filed: April 16, 1987
    Date of Patent: February 7, 1989
    Assignee: Koike Sanso Kogyo Co.
    Inventors: Etsuo Nakano, Akira Furujo, Tetsuya Iizuka