Patents by Inventor Mutsuo Sezaki

Mutsuo Sezaki 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).

  • Recording telephone system equipped with a remote control change-over switch
    Patent number: 4891834
    Abstract: A message telephone with message recording and reproducing function equipped with remote control switch is disclosed. The message telephone has a calling signal identification circuit and after counting a predetermined number of calling signals, if the calling party once disconnects the call and orginates a second call within a predetermined time interval the device works as a message telephone after providing an identifying MF signal pass-word to work various message functions under control of the remote calling party.
    Type: Grant
    Filed: October 18, 1988
    Date of Patent: January 2, 1990
    Assignees: C. Itoh Fuel Co., Ltd., Nishitomo Co., Ltd.
    Inventors: Mutsuo Sezaki, Kinji Nishimura