Patents by Inventor Sadao Yamaoka

Sadao Yamaoka 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).

  • Jam detecting device in the electrophotographic copying machine
    Patent number: 4084900
    Abstract: A jam detecting device for detecting copy paper jamming occurring in an electrophotographic copying machine having a first circuit for detecting the presence of a copy paper which is ready to be fed into various processing stations, a second circuit for detecting the presence of the same copy paper at a position at which it is ready to be discharged out of the copying machine and a timer circuit for measuring the time interval between the detections by the first and second circuits and for producing, in the event the time interval exceeds a predetermined time, a signal indicative of a paper jam occurring in the machine.
    Type: Grant
    Filed: December 6, 1976
    Date of Patent: April 18, 1978
    Assignee: Minolta Camera Kabushiki Kaisha
    Inventors: Sadao Yamaoka, Kenichi Arai