Patents by Inventor Tuneo Maruyama

Tuneo Maruyama 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).

  • Inner rotor and outer rotor of internal gear pump
    Patent number: 7479174
    Abstract: An inner rotor having excellent corrosion resistance, which has an outer gear serving as a component of an internal gear pump, and an outer rotor having excellent corrosion resistance, which has an inner gear engaging with the outer gear. The inner rotor and outer rotor of are made of Cu—Ni-based sintered copper alloy that contains 12 to 50% by mass of Ni, 5 to 20% by mass of Sn, 0.5 to 5% by mass of C, and if necessary, further contains 5 to 20% by mass of Zn, 0.1 to 0.9% by mass of P, and a balance being Cu and inevitable impurities.
    Type: Grant
    Filed: March 29, 2005
    Date of Patent: January 20, 2009
    Assignee: Mitsubishi Materials PMG Corporation
    Inventors: Teruo Shimizu, Tuneo Maruyama
  • Inner Rotor And Outer Rotor Of Internal Gear Pump
    Publication number: 20070199408
    Abstract: An inner rotor having excellent corrosion resistance, which has an outer gear serving as a component of an internal gear pump, and an outer rotor having excellent corrosion resistance, which has an inner gear engaging with the outer gear. The inner rotor and outer rotor of are made of Cu—Ni-based sintered copper alloy that contains 12 to 50% by mass of Ni, 5 to 20% by mass of Sn, 0.5 to 5% by mass of C, and if necessary, further contains 5 to 20% by mass of Zn, 0.1 to 0.9% by mass of P, and a balance being Cu and inevitable impurities.
    Type: Application
    Filed: March 29, 2005
    Publication date: August 30, 2007
    Applicant: Mitsubishi Materials PMG Corporation
    Inventors: Teruo Shimizu, Tuneo Maruyama