Patents by Inventor Zalmai S. Shahbaz

Zalmai S. Shahbaz 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).

  • Automatic counting system for passages
    Patent number: 4528679
    Abstract: The invention is particularly useful for counting the passengers moving into and out of a common carrier vehicle such as a motor bus. Three ultrasonic ranging stations are provided to determine the presence and absence of passengers at three successive positions at the bus entrance. The three positions may correspond respectively to three steps through the entrance. Sequence logic circuitry is included for analyzing the sequence of detection of passengers at the three different ranging stations to establish a count of the number of passengers entering or leaving.
    Type: Grant
    Filed: March 14, 1983
    Date of Patent: July 9, 1985
    Assignee: General Signal Corporation
    Inventors: Zalmai S. Shahbaz, Klaus H. Frielinghaus