Patents by Inventor Masafumi Miyao

Masafumi Miyao 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).

  • Device for preventing leakage at pipe joints
    Patent number: 4346922
    Abstract: This device comprises a cylindrical member integrally made of an elastic material for covering the inside periphery of a pipe joint, belt members impregnated with a bonding agent to be squeezed out by pressure, and circular expanding members for expanding said cylindrical member when positioned inside the cylindrical member and subsequently expanded.
    Type: Grant
    Filed: March 21, 1980
    Date of Patent: August 31, 1982
    Inventors: Hisao Ohtsuga, Koji Uzawa, Takashi Kamuro, Susumu Sudo, Tomoyoshi Hirose, Masafumi Miyao, Motoyuki Koga