Patents by Inventor Shuji Sakamoto

Shuji Sakamoto 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).

  • Patent number: 4189678
    Abstract: A combination VHF-UHF tuner includes a VHF tuner and a UHF tuner in which the VHF tuner has at least three tuning networks connected in a stage preceding a mixer and each constituted by first and second coils and a variable capacitance diode. The first coil in each of the tuning network is coupled to a switching diode for shortcircuiting the first coil for establishing a network operable to a high band VHF signal and for opening the first coil connected to the second coil for establishing a tuning network operable to a low band VHF signal. A band selecting circuit is provided for controlling the three tuning networks in such a manner that the three tuning networks are all operable to the high or low band VHF signal when the VHF channel is tuned in and that at least one of the three tuning networks is operable to the high band VHF signal while the remaining is operable to the low band VHF signal when the UHF channel is tuned in.
    Type: Grant
    Filed: August 17, 1978
    Date of Patent: February 19, 1980
    Assignee: Sanyo Electric Co., Ltd.
    Inventors: Shuji Sakamoto, Shuichi Wada