Patents by Inventor Koji Ohsawa

Koji Ohsawa 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 removing particles from a semiconductor wafer
    Patent number: 6248180
    Abstract: A method of removing particles adhering to a surface of a semiconductor wafer including the steps of: providing a container having a drain valve; positioning the semiconductor wafer in the container; directing a jet stream consisting of water against the surface of the semiconductor wafer; removing particles adhering to the surface of the semiconductor wafer by scrubbing the surface of the semiconductor wafer with a brush while the jet stream of water is directed against the surface of the semiconductor wafer; closing the drain valve while the jet stream of water is directed against the semiconductor wafer, wherein the water accumulates in the container to thereby completely immerse the brush and the semiconductor wafer in the water in the container; and maintaining the brush and the semiconductor wafer completely immersed in the water from the jet stream for a predetermined period of time.
    Type: Grant
    Filed: September 9, 1998
    Date of Patent: June 19, 2001
    Assignee: LSI Logic Corporation
    Inventors: Nobuyoshi Sato, Hideaki Seto, Koji Ohsawa, Haruhiko Yamamoto