Patents by Inventor Tetsuo Kanazashi

Tetsuo Kanazashi 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).

  • Terminal device for CATV
    Patent number: 4109281
    Abstract: In a CATV system, a received signal band containing video channels and a data signal at a selected frequency is successively converted in frequency so as to provide a chosen video signal at the frequency of a selected channel. After the first conversion a residual fundamental of the data signal carrier is bandpass filtered, amplified and then demodulated to extract the data signal. The needed filtering and signal processing can thereby be more economically accomplished without adverse effects on adjacent video signal channels.
    Type: Grant
    Filed: April 14, 1977
    Date of Patent: August 22, 1978
    Assignee: Pioneer Electronic Corporation
    Inventors: Tetsuo Kanazashi, Tsuyoshi Fujiwara