Patents by Inventor Toshiro Mase

Toshiro Mase 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).

  • Oil well pipe joint
    Patent number: 4630849
    Abstract: An oil well pipe joint comprising a metal-to-metal sealing portion without thread is disclosed. A metal-plated or resin-coated layer exhibiting improved resistance to galling is provided on the outer peripheral surface of a thread-free lip portion which constitutes part of the metal-to-metal sealing portion on an externally-threaded member. At the metal sealing portion, satisfactory sealing properties are maintained under severe corrosive conditions, enabling the joint to be connected and disconnected over 10 times, and usually over 25 times.
    Type: Grant
    Filed: March 27, 1985
    Date of Patent: December 23, 1986
    Assignee: Sumitomo Metal Industries, Ltd.
    Inventors: Kunihiro Fukui, Minoru Nishihara, Toshiro Mase, Yoshiyasu Morita, Hisakazu Kawashima
  • Bolt and nut unit coated with lubricant
    Patent number: 4206060
    Abstract: A bolt and nut unit coated with lubricant comprising graphite and/or molybdenum disulfide, an ethylene-vinyl acetate copolymer and a fatty acid or a metallic soap thereof. This lubricant has low temperature sensitivity, and the bolt and nut unit coated therewith can be tightened precisely into position with a constant torque regardless of variations in ambient temperature and humidity.
    Type: Grant
    Filed: October 23, 1978
    Date of Patent: June 3, 1980
    Assignees: Sumitomo Kinzoku Kogyo Kabushiki Kaisha, Umebachi Fastener Kabushiki Kaisha
    Inventors: Hideo Yamamoto, Toshiro Mase, Hidehiro Mukai, Hisao Nakayama