Patents Examined by Thomas H. Tarola
  • Fish school detecting method or apparatus
    Patent number: 4894661
    Abstract: A fish school detecting method or apparatus radiates radio search signals with their carrier frequency in the S-band frequency range, successively in different azimuthal directions through a wide angular range, receives echo signals, and displays the echo signals on the screen of an indicator in such a manner that the echo signal reflected by a bird is clearly distinguished from the other objects, thereby locating the bird and detecting a fish school under the bird.
    Type: Grant
    Filed: April 21, 1987
    Date of Patent: January 16, 1990
    Assignee: Furuno Electric Company, Limited
    Inventors: Kiyotaka Furuno, Hidetoshi Tanigaki, Kouji Yano, Tadashi Ozaki, Yoshihisa Fukuda, Takumi Fujikawa, Makoto Tanaka