Patents by Inventor Yasunori Katayama

Yasunori Katayama 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).

  • Elevator control system
    Patent number: 4350225
    Abstract: A control logic for an elevator servicing a plurality of floors of a building comprises two microcomputers. The two microcomputers are provided with abnormal state detectors of their own. When the abnormal state detector of one microcomputer is actuated, the elevator is operated for recovery to the nearest floor by the other microcomputer on the condition that the abnormal state detector of the other microcomputer is not actuated, and thereafter retrial for the abnormal microcomputer is effected by an instruction from the other microcomputer. When the abnormal microcomputer recovers to normal state by the retrial, the elevator keeps operating, thereby preventing such a problem that the elevator cannot continue service by erroneous operation due to noise.
    Type: Grant
    Filed: January 31, 1980
    Date of Patent: September 21, 1982
    Assignee: Hitachi, Ltd.
    Inventors: Kazuhiro Sakata, Takeo Yuminaka, Masao Nakazato, Kenji Yoneda, Soshiro Kuzunuki, Yasunori Katayama