Patents by Inventor Tetsuomi Miyamoto

Tetsuomi Miyamoto 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).

  • Downhole percussion drills
    Patent number: 6752222
    Abstract: Provided is a downhole percussion drill, which is installed at an end portion of a drillstring and performs drilling by giving impact blows to a drill bit at the bottomhole, which includes a hydraulic hammering mechanism 7 which uses oil having high lubricating ability as a driving medium, a hydraulic pump 8 which pressurizes the oil, and a downhole motor 9 which drives the hydraulic pump 8.
    Type: Grant
    Filed: December 10, 2002
    Date of Patent: June 22, 2004
    Assignees: National Institute of Advanced Industrial Science and Technology, Furukawa Co., Ltd., K. Maikai Co., Ltd.
    Inventors: Hirokazu Karasawa, Tetsuji Ohno, Akinori Ota, Tsutomu Kaneko, Naoto Yamada, Tetsuomi Miyamoto
  • Downhole percussion drills
    Publication number: 20030111240
    Abstract: Provided is a downhole percussion drill, which is installed at an end portion of a drillstring and performs drilling by giving impact blows to a drill bit at the bottomhole, which includes a hydraulic hammering mechanism 7 which uses oil having high lubricating ability as a driving medium, a hydraulic pump 8 which pressurizes the oil, and a downhole motor 9 which drives the hydraulic pump 8.
    Type: Application
    Filed: December 10, 2002
    Publication date: June 19, 2003
    Applicant: National Institute of Advanced Industrial
    Inventors: Hirokazu Karasawa, Tetsuji Ohno, Akinori Ota, Tsutomu Kaneko, Naoto Yamada, Tetsuomi Miyamoto