Patents by Inventor Robert D. Barry

Robert D. Barry 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).

  • Polyphase AC motor control
    Patent number: 3962613
    Abstract: A control for a polyphase a.c. motor having field coils, each of which is connected to first rectifiers connected to form a first junction and second rectifiers connected to form a second junction and a transistor controlling the current between the first and second junction in response to a control signal.
    Type: Grant
    Filed: January 31, 1973
    Date of Patent: June 8, 1976
    Assignee: Wer Industrial Division of Emerson Electric Co.
    Inventor: Robert D. Barry