Patents by Inventor Nobuhito Miyashita

Nobuhito Miyashita 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).

  • Vacuum pump unit
    Patent number: 8251678
    Abstract: The present invention relates to a dry vacuum pump unit capable of achieving ultimate pressure of about 1 Pa. The vacuum pump unit includes a main pump (15) disposed at an outside-pressure side, and a booster pump (16) disposed at a vacuum side. The booster pump (16) and the main pump (15) are coupled in series. The booster pump (16) has a higher pumping speed than that of the main pump (15). Each of the main pump (15) and the booster pump (16) includes a pair of pump rotors (52a and 52b), a casing (50) having an inlet port and an outlet port, and a pair of magnet rotors (54 and 54) rotatable with the pair of pump rotors.
    Type: Grant
    Filed: January 29, 2007
    Date of Patent: August 28, 2012
    Assignee: Ebara Corporation
    Inventors: Takashi Hozumi, Nobuhito Miyashita, Takanori Inada, Kozo Matake, Yoshinori Ojima, Susumu Miyake, Katsuaki Usui
  • VACUUM PUMP UNIT
    Publication number: 20090047142
    Abstract: The present invention relates to a dry vacuum pump unit capable of achieving ultimate pressure of about 1 Pa. The vacuum pump unit includes a main pump (15) disposed at an outside-pressure side, and a booster pump (16) disposed at a vacuum side. The booster pump (16) and the main pump (15) are coupled in series. The booster pump (16) has a higher pumping speed than that of the main pump (15). Each of the main pump (15) and the booster pump (16) includes a pair of pump rotors (52a and 52b), a casing (50) having an inlet port and an outlet port, and a pair of magnet rotors (54 and 54) rotatable with the pair of pump rotors.
    Type: Application
    Filed: January 29, 2007
    Publication date: February 19, 2009
    Applicants: EBARA DENSAN LTD., EBARA CORPORATION
    Inventors: Takashi Hozumi, Nobuhito Miyashita, Takanori Inada, Kozo Matake, Yoshinori Ojima, Susumu Miyake, Katsuaki Usui
  • Screw pump and method of operating the same
    Patent number: 7338266
    Abstract: A screw pump includes a pair of screw rotors (2a, 2b) having teeth which are held in mesh with each other for drawing and discharging a fluid by rotating the screw rotors (2a, 2b) synchronously in opposite directions. The teeth of the screw rotors (2a, 2b) have the same shape as each other and are coiled helically in opposite directions. The teeth of the screw rotors (2a, 2b) have an axial tooth profile which allows a pair of facing teeth surfaces T of the screw rotors (2a, 2b) to be brought into contact with each other only at a pitch line P when the pair of facing teeth surfaces T are brought into contact with each other.
    Type: Grant
    Filed: October 2, 2003
    Date of Patent: March 4, 2008
    Assignees: Ebara Densan Ltd., Ebara Corporation
    Inventors: Nobuhito Miyashita, Kozo Matake
  • Screw pump and method of operating the same
    Publication number: 20050236437
    Abstract: A screw pump includes a pair of screw rotors (2a, 2b) having teeth which are held in mesh with each other for drawing and discharging a fluid by rotating the screw rotors (2a, 2b) synchronously in opposite directions. The teeth of the screw rotors (2a, 2b) have the same shape as each other and are coiled helically in opposite directions. The teeth of the screw rotors (2a, 2b) have an axial tooth profile which allows a pair of facing teeth surfaces T of the screw rotors (2a, 2b) to be brought into contact with each other only at a pitch line P when the pair of facing teeth surfaces T are brought into contact with each other.
    Type: Application
    Filed: October 2, 2003
    Publication date: October 27, 2005
    Inventors: Nobuhito Miyashita, Kozo Matake