Patents by Inventor Tatsuo Iwaska

Tatsuo Iwaska 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: 3967702
    Abstract: Elevator cars for servicing a plurality of floors are under the control of register means provided at elevator halls to registrate the hall calls for the up- and down-directions. Detector means are installed at the elevator halls to detect the number of the passengers awaiting the cars at the halls. Discriminator means are employed to obtain the information concerning the number of the car awaiting passengers classified for each of the directions of their destinations. The information thus obtained is utilized in the elevator control apparatus to operate the elevator system with a high working efficiency. When the hall calls for one direction are registrated, the detected number of the car awaiting passengers is regarded as the number of the awaiting passengers for the hall calls of the above one direction.
    Type: Grant
    Filed: December 16, 1974
    Date of Patent: July 6, 1976
    Assignee: Hitachi, Ltd.
    Inventors: Tatsuo Iwaska, Takeo Yuminaka, Takashi Kaneko, Hiroshi Kinoshita