Patents by Inventor Tadashi Miyaoka

Tadashi Miyaoka 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).

  • Spheroidal graphite cast iron pipe of ferritic structure and method of producing the same
    Patent number: 3954133
    Abstract: A product and method of producing a spheroidal graphite cast iron pipe of ferritic structure by casting in a non-chilled condition and by providing a controlled low rate of dissipation of the self-heat of the pipe within a heat dissipation rate controlling furnace or a sealed or insulated centrifugal casting mold.
    Type: Grant
    Filed: February 20, 1975
    Date of Patent: May 4, 1976
    Assignee: Kubota Ltd.
    Inventors: Tadashi Miyaoka, Hiromu Tanimura, Yoshio Tanaka, Susumu Togawa
  • Method of producing high duty cast iron
    Patent number: 3954446
    Abstract: A refining means for obtaining high duty spheroidal graphite cast iron through heating molten pig iron in an arc furnace to above the decomposition temperature of silicon oxide in the presence of carbon, such as 1500.degree.C, whereupon a refining agent containing quick lime, graphite powder, calcium silicate, and calcium carbonate is allowed to react in refining through deoxidation and de-sulphurization.
    Type: Grant
    Filed: January 8, 1975
    Date of Patent: May 4, 1976
    Assignee: Kubota Ltd.
    Inventors: Tadashi Miyaoka, Hiromu Tanimura, Yoshio Tanaka, Susumu Togawa
  • Pipe joint construction
    Patent number: 3941410
    Abstract: A sealed, vibration resistant, non-separating joint construction connects the plug end of one pipe to the socket end of another pipe. A split lock ring, recessed in an internal groove in the the plug end before insertion of the plug into the socket, is then contracted and extended from the groove into engagement with the outer surface of the plug by set screws on the socket spaced circumferentially around the groove. The contracted lock ring centers the plug in the socket and axially overlaps a radially projecting shoulder or step surface on the plug to prevent axial separation. A sealing member is pressed axially into the annular space between the inner surface of the socket, the outer surface of the plug, and the outer lateral surface of a back-up ring covering the outer lateral surface of the lock ring.
    Type: Grant
    Filed: October 10, 1974
    Date of Patent: March 2, 1976
    Inventor: Tadashi Miyaoka
  • Universal pipe joint construction
    Patent number: 3938833
    Abstract: A universal joint construction connecting the ends of two pipes is formed by a pair of articulation rings, each fitted over the end portion of one of the pipes and attached thereto. A spherical convex outer surface on each articulation ring is engaged in opposite axial directions by a pair of concave inner surfaces - one on a joint or coupling pipe, and the other on a separation preventive ring attached to the joint pipe. A sealing member is provided between each pipe and articulation ring and between each joint pipe and articulation ring. For attachment, each of the articulation and separation preventive rings is provided with an internal annular groove receiving a split lock ring which is contracted to engage an external recess in the associated pipe by radially extending screws entering the groove at circumferentially spaced locations.
    Type: Grant
    Filed: October 10, 1974
    Date of Patent: February 17, 1976
    Inventor: Tadashi Miyaoka