Patents by Inventor Koutaro Tsuri

Koutaro Tsuri 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).

  • Heat exchanger tube and method for manufacturing the same
    Patent number: 5992512
    Abstract: A heat exchanger tube for effecting a heat exchange between a fluid inside the heat exchanger tube and another fluid flowing outside the heat exchanger tube, which is provided with a first kind of spiral grooves and a second kind of spiral grooves, each being formed on an outer surface of the heat exchanger tube. The twisting direction of the first kind of spiral grooves in relative to the axis of the heat exchanger tube is the same as that of the second kind of spiral grooves but differs in helix angle from each other with helix angles of the first kind of spiral grooves and the second kind of spiral grooves falling within the range of 3.degree. to 80.degree. in relative to the axis of the heat exchanger tube.
    Type: Grant
    Filed: March 17, 1997
    Date of Patent: November 30, 1999
    Assignee: The Furukawa Electric Co., Ltd.
    Inventors: Koutaro Tsuri, Hideaki Kameoka, Gou Isobe, Takeshi Nishizawa, Masanori Ozaki