Patents by Inventor Tsuneyoshi Takasuna

Tsuneyoshi Takasuna 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).

  • Method of making fin elements for heat exchangers
    Patent number: 4211276
    Abstract: In a crossed fin-tube type heat exchanger wherein tubes are attached at right angles to a large number of fin elements arranged in parallel with one other, the surfaces of these fin elements are roughened to have an unevenness satisfying a relationR.apprxeq.1/cos.theta.where R is a ratio of the extended, uneven or roughened surface to the flat or smooth surface of the fin element; and .theta. is a contact angle for a liquid droplet in contact with the flat or smooth surface of the fin element.
    Type: Grant
    Filed: June 22, 1978
    Date of Patent: July 8, 1980
    Assignee: Hitachi, Ltd.
    Inventors: Masaaki Itoh, Tsuneyoshi Takasuna, Yuichi Ishikawa, Hideyuki Kimura, Masanori Musoh