Patents by Inventor Minoru Murai

Minoru Murai 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).

  • Apparatus for retaining lubrication oil at sliding surface of shaft seal device disposed within oil chamber of submersible pump
    Patent number: 6641140
    Abstract: An apparatus for retaining lubrication oil at the sliding surface of a double-type shaft seal device disposed within an oil chamber of a submersible pump. The apparatus prevents lubrication oil from scattering from the center portion of the oil chamber of the submersible pump toward the circumferential wall, and prevents entrapment of air into the lubrication oil through formation of an oil film in the oil outlet, irrespective of variation in rotational speed of the pump shaft, so that the seal apparatus is lubricated and cooled effectively.
    Type: Grant
    Filed: October 15, 2001
    Date of Patent: November 4, 2003
    Assignee: Tsurumi Manufacturing Co., Ltd.
    Inventors: Satoshi Matsumoto, Minoru Murai