Patents by Inventor Kazuhiko Kakehi

Kazuhiko Kakehi 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).

  • Transmitting and receiving apparatus
    Patent number: 4002860
    Abstract: Only one reversible electro-acoustic converter is used to act without a press-to-talk switch or the like as a transmitter and a receiver. The electro-acoustic converter is connected to a communication line through two 2 - 4 converters in the form of hybrid transformers which are interconnected to form a transmitting system and a receiving system.
    Type: Grant
    Filed: April 2, 1975
    Date of Patent: January 11, 1977
    Assignee: Nippon Telegraph and Telephone Public Corporation
    Inventors: Masaaki Terai, Kazuhiko Kakehi, Ryoichi Matsuda, Giichi Ito