Patents by Inventor Isaac R. Barpal

Isaac R. Barpal 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).

  • Train vehicle speed control signal providing apparatus
    Patent number: 4002314
    Abstract: The present invention relates to a train vehicle speed control signal providing apparatus operative with a frequency command speed control signal, and relates to the generation of the desired speed code signals in such a frequency rate system. Two separate and independent physical and electrical operations provide each of the respective desired frequency speed code signals in combination with a comparison step to provide an output speed code signal only if the two input frequency signals are each at the desired frequency.
    Type: Grant
    Filed: July 7, 1975
    Date of Patent: January 11, 1977
    Assignee: Westinghouse Electric Corporation
    Inventor: Isaac R. Barpal