Patents by Inventor Denis Cho

Denis Cho 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).

  • Device for monitoring escalator handrail speed
    Patent number: 5645156
    Abstract: An improved escalator 10 which incorporates a device 58 which monitors the speed of an escalator handrail 12. The escalator having a handrail and a transmission unit 14. The device cooperates with a portion of the transmission unit that moves at the same speed as the handrail. Various details are developed which facilitate the monitoring of the handrail speed. In one detailed embodiment, the device includes a plurality of targets 60 and a sensor 62 which is not interfered with by the handrail.
    Type: Grant
    Filed: September 1, 1993
    Date of Patent: July 8, 1997
    Assignee: Otis Elevator Company
    Inventors: Vlad Zaharia, Denis Cho