Patents by Inventor Tsuneji Koshikawa

Tsuneji Koshikawa 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).

  • Object recognition system
    Patent number: 4084148
    Abstract: An object recognition system wherein, in order to derive the features of an object to-be-recognized such as shape and size from a reflected wave or echo, the ratio between a signal obtained by Fourier transforming a part of a transmitting wave for the object and a signal obtained by Fourier transforming a received reflecting wave is subjected to the inverse Fourier transform so as to obtain separate reflection signals corresponding to a large number of reflecting points of the object, whereby the features of the object are recognized by utilizing the reflection signals.
    Type: Grant
    Filed: October 7, 1976
    Date of Patent: April 11, 1978
    Assignee: Hitachi, Ltd.
    Inventor: Tsuneji Koshikawa
  • Frequency band converter
    Patent number: 3934094
    Abstract: A frequency band converter wherein a signal whose frequency band is to be converted is written in a random access memory at a predetermined cycle while the contents of the random access memory are read out sequentially at a cycle different from the writing cycle thereby to obtain a frequency band converted output signal.
    Type: Grant
    Filed: August 27, 1973
    Date of Patent: January 20, 1976
    Assignee: Hitachi, Ltd.
    Inventors: Masaharu Kobayashi, Tsuneji Koshikawa, Toshio Tanizoe