Patents by Inventor Sotosuke Matsumoto

Sotosuke Matsumoto 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).

  • Stern tube seal
    Patent number: 4461487
    Abstract: A stern tube seal having a fixed slidable ring and a rotatable and slidable ring in close contact and sliding with respect to the fixed slidable ring, wherein an annular groove is formed in a sliding end surface of the fixed slidable ring, a leaked liquid recovery line is disposed from the fixed slidable ring to the side of inboard, and if necessary, an annular lip portion having a pressure receiving surface disposed on the side of inboard is fitted within the annular groove.
    Type: Grant
    Filed: March 9, 1983
    Date of Patent: July 24, 1984
    Assignee: Eagle Industry Co., Ltd.
    Inventor: Sotosuke Matsumoto
  • Stern tube face seal with funnel-shaped packing
    Patent number: 4429884
    Abstract: A stern tube seal wherein a rotatable and slidable ring in close contact and sliding with respect to a fixed slidable ring secured to a stern frame side is loosely slipped over a rotating shaft (stern tube), and a packing having a shape of approximately funnel is interposed between said rotatable and slidable ring and a housing secured to said rotating shaft, whereby relative displacement of said rotating shaft with respect to said stern frame is not propagated to said rotatable and slidable ring by elasticity of said packing.
    Type: Grant
    Filed: March 9, 1983
    Date of Patent: February 7, 1984
    Assignee: Eagle Industry Co., Ltd.
    Inventor: Sotosuke Matsumoto