Patents by Inventor David J. Sirag

David J. Sirag 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).

  • Using fuzzy logic to determine the number of passengers entering and exiting an elevator car
    Patent number: 5219042
    Abstract: Embedded elevator control software, responsive to WEIGHT, CARCALLS, HALLCALLS and STOPS signals, uses fuzzy logic to determine the number of passengers entering and exiting an elevator car at a stop. The software forms three fuzzy logic sets representing temporary estimates of the number of entering passengers and forms three fuzzy logic sets indicative of temporary estimates of the number of exiting passengers. The sets are combined to form a single fuzzy logic set indicative of the number of entering passengers and a single fuzzy logic set indicative of the number of exiting passengers.
    Type: Grant
    Filed: December 17, 1991
    Date of Patent: June 15, 1993
    Assignee: Otis Elevator Company
    Inventors: Siddiq A. Sattar, John K. Mizon, David J. Sirag, Jr.