Patents by Inventor Tadao Yamaji

Tadao Yamaji 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).

  • Patent number: 5660924
    Abstract: A vacuum heat insulator is provided which includes a vacuum heat-insulated space defined between a pair of spaced outer skin members, a portion of the space closer to one of the outer skin members being set as high-temperature side, with a portion closer to the other outer skin member being set as low-temperature side. A laminate is disposed at the high-temperature side of the vacuum heat-insulated space, and a board having an inorganic material is disposed at the low temperature side. The laminate includes inorganic sheet members and metallic foils with low heat emissivity, the sheet members and metallic foils being alternately laid in plural layers.
    Type: Grant
    Filed: March 31, 1995
    Date of Patent: August 26, 1997
    Assignee: Kubota Corporation
    Inventors: Tadao Yamaji, Masayoshi Aoki, Hiroshi Yamasaki, Shigeru Tanaka, Masahisa Ochi
  • Patent number: 4417754
    Abstract: A pipe joint for preventing separation comprising a holding member connectable to an annular outer flange formed at the end of a socket and surrounding the outer periphery of a spigot outside the socket, the holding member being annular or being adapted to form an annular shape, the holding member being provided on its inner periphery with a tapered surface increasing in diameter toward the socket; a stopper in the form of a ring divided at one portion and provided with an outer peripheral tapered surface increasing in diameter toward the socket and with engaging edges in circumferential rows on its inner periphery, the stopper being interposed between the tapered surface of the holding member and the spigot outer periphery; and tap bolts extending through the holding member at suitable portions along its circumference for pressing the stopper from outside against the spigot outer periphery. Because the stopper is thus shaped, the joint is easy to assemble and manufacture.
    Type: Grant
    Filed: April 16, 1982
    Date of Patent: November 29, 1983
    Assignee: Kubota, Ltd.
    Inventors: Tadao Yamaji, Toshi Nakajima, Takeshi Kashi
  • Patent number: 4183561
    Abstract: The open end inner periphery of a socket is provided with an annular groove, and at a suitable sufficient distance from the annular groove axially toward the innermost side of the socket a seal member stopping projection extends from the inner surface of the socket toward the outer peripheral surface of a spigot. A split lock ring is fitted in the annular groove. The outer peripheral surface of the spigot is provided with a projection which is disposed between the split lock ring and the stop projection and which is axially movable therebetween along with the spigot and adapted to engage with them at the ends of its travel. A seal member is disposed between a seal member supporting surface disposed inwardly of the stop projection and the outer peripheral surface of the spigot. This seal member is urged toward the stop projection by an urging device.
    Type: Grant
    Filed: December 29, 1977
    Date of Patent: January 15, 1980
    Assignee: Kubota, Ltd.
    Inventors: Hiroshi Miyamoto, Tadao Yamaji, Toshi Nakajima, Takao Sagara
  • Patent number: 4116478
    Abstract: A spigot is inserted into a socket, with a seal packing pressed from the opening side of the socket into an annular space defined between the socket and the spigot, a lock ring fitted in an annular groove formed in the inner peripheral surface of the pocket inwardly of the seal packing, and an engaging projection provided on the outer periphery of the front end of the spigot for axial engagement with the lock ring. The lock ring is a split lock ring which can be inserted from the annular space between the socket and the spigot toward the innermost part of the socket and has a diametrically expanding force. The depth of the annular groove is controlled so as to allow the radially inner region of the lock ring fitted in the groove to engage the engaging projection. A back-up ring is disposed between the seal packing and the split lock ring and the mutual abutting surfaces of the split lock ring and back-up ring are conical surfaces tapering toward the front end of the spigot.
    Type: Grant
    Filed: September 1, 1977
    Date of Patent: September 26, 1978
    Assignee: Kubota, Ltd.
    Inventors: Tadao Yamaji, Toshi Nakajima, Takao Sagara