Patents by Inventor Minoru Takayasu

Minoru Takayasu 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: 10065724
    Abstract: An arrangement for sealing a propeller shaft of a marine vessel are specifically applicable in preventing oil leakage via propeller shaft sealing in cases where the draught of a marine vessel is, for some reason, reduced beyond its ordinary value.
    Type: Grant
    Filed: April 17, 2012
    Date of Patent: September 4, 2018
    Assignee: WARTSILA FINLAND OY
    Inventors: Arnoud De Kruijf, Rik Roemen, Minoru Takayasu, Bart Van Der Ven, Joost Van Eijnatten, Masahiko Yotsuyanagi
  • Publication number: 20150076768
    Abstract: An arrangement for sealing a propeller shaft of a marine vessel are specifically applicable in preventing oil leakage via propeller shaft sealing in cases where the draught of a marine vessel is, for some reason, reduced beyond its ordinary value.
    Type: Application
    Filed: April 17, 2012
    Publication date: March 19, 2015
    Applicant: WARTSILA FINLAND OY
    Inventors: Arnoud De Kruijf, Rik Roemen, Minoru Takayasu, Bart Van Der Ven, Joost Van Eijnatten, Masahiko Yotsuyanagi
  • Patent number: 8348281
    Abstract: A stern tube sealing assembly and a seal ring thereof has a key part having an inverted V-shape, a front step part on the front side, and a back step part on the back side thereof. The seal ring width in a propulsion-shaft axis direction becomes thinner in the transition area from the key part toward a heel part. The inner diameter of the key part at the back step part is greater than that of the key part at the front step part. The ring has a lip part having a V-shaped lip tip protruding inwardly in the radial direction and a spring groove having a semicircular cross-section. The center of the spring groove is nearer to the inboard side than the lip tip, by an offset in the axis direction, the offset being within approximately 10% of the orthogonal projection length of the width of the lip back.
    Type: Grant
    Filed: January 28, 2011
    Date of Patent: January 8, 2013
    Assignee: Wartsila Japan Ltd.
    Inventors: Hisashi Yoshida, Motofumi Inaba, Minoru Takayasu
  • Publication number: 20110304102
    Abstract: (Means) A seal ring in which an apex part of the key part is formed so that the cross-section profile regarding the apex part forms a reversed V-shape toward the outside in the radial direction; the summit T of the reversed V-shape is formed as the middle center T of the apex part; a step part on the front surface side of the key part and a step part on the back surface side of the key part are formed so that the width of the seal ring in the axis direction of the ship propulsion shaft becomes thinner in the transition area from the key part toward the heel part; the inner diameter of the key part at the step part on the back surface side of the key part is greater than the inner diameter of the key part at the step part on the front surface side of the key part; a lip tip of the lip part forms a V-shape protruding inward in the radial direction and a spring groove having a semicircular cross-section in which a ringed spring is formed in the lip part; the center regarding the spring groove is arranged so as t
    Type: Application
    Filed: January 28, 2011
    Publication date: December 15, 2011
    Applicant: WARTSILA JAPAN LTD.
    Inventors: Hisashi YOSHIDA, Motofumi INABA, Minoru TAKAYASU
  • Patent number: 6481720
    Abstract: The invention provides a stern tube sealing apparatus which prevents an abrasion by cooling and lubricating a sliding contact surface of a first seal ring, prevents a foreign substance and a seawater from entering so as to further improve a durability of a seal ring and a liner, intends to make the sealing apparatus compact and reduce a cost by using no pressurizing apparatus, and has a high reliability of a seal system.
    Type: Grant
    Filed: August 21, 2000
    Date of Patent: November 19, 2002
    Assignee: Japan Marine Technologies Ltd.
    Inventors: Hisashi Yoshida, Minoru Takayasu
  • Patent number: D631948
    Type: Grant
    Filed: July 20, 2010
    Date of Patent: February 1, 2011
    Assignee: Wartsila Japan Ltd.
    Inventors: Hisashi Yoshida, Motofumi Inaba, Minoru Takayasu
  • Patent number: D638522
    Type: Grant
    Filed: July 20, 2010
    Date of Patent: May 24, 2011
    Assignee: Wārtsilā Japan Ltd.
    Inventors: Hisashi Yoshida, Motofumi Inaba, Minoru Takayasu
  • Patent number: D638523
    Type: Grant
    Filed: July 20, 2010
    Date of Patent: May 24, 2011
    Assignee: Wärtsilä Japan Ltd.
    Inventors: Hisashi Yoshida, Motofumi Inaba, Minoru Takayasu