Patents by Inventor Masayuki Misaizu

Masayuki Misaizu 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).

  • Multistage roots-type vacuum pump
    Patent number: 7491041
    Abstract: The invention reduces power consumption and makes a rotor with ease. As illustrated in FIG. 2, a multistage roots pump (1) in the invention includes upstream rotors (R1a, R1b, R2a, R2b) having multiple teeth, supported by a pair of revolving shafts (A1, A2); and downstream rotors (R3a, R3b-R5a, R5b) having an identical number of teeth (31) with the upstream rotors, supported by revolving shafts (A1, A2). The discharge area formed by the outer periphery of the downstream rotors (R3a, R3b-R5a, R5b) and the inner periphewy of the pump chambers (P1-P5) is smaller than that of the upstream rotors (R1a, R1b, R2a, R2b).
    Type: Grant
    Filed: August 24, 2006
    Date of Patent: February 17, 2009
    Assignee: Kashiyama Industries, Ltd.
    Inventors: Toshio Imai, Hideaki Itou, Masayuki Misaizu
  • Multistage root type pump
    Publication number: 20070048162
    Abstract: The invention reduces power consumption and makes rotor with ease. As illustrated in FIG. 2, a multistage roots pump (1) in the invention including upstream rotors (R1a, R1b, R2a, R2b) having multiple teeth, supported by a pair of revolving shafts (A1, A2); and downstream rotors (R3a, R3b˜R5a, R5b) having identical number of teeth (31) with the upstream rotors, supported by revolving shafts (A1, A2). The discharge area formed by the outer periphery of the downstream rotors (R3a, R3b˜R5a, R5b) and the inner periphery of the pump chambers (P1˜P5) is smaller than that of the upstream rotors (R1a, R1b, R2a, R2b).
    Type: Application
    Filed: August 24, 2006
    Publication date: March 1, 2007
    Applicant: Kashiyama Industries, LTD.
    Inventors: Toshio Imai, Hideaki Itou, Masayuki Misaizu