Patents by Inventor Ronald E. Schwartz

Ronald E. Schwartz 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).

  • Ultrasonic method and apparatus for spot weld control
    Patent number: 4711984
    Abstract: Ultrasonic transducers spring biased into seating engagement in a pair of opposed spot welding tips transmit and receive ultrasonic waves and associated circuitry measures the time of flight between the transducers which is a function of tip separation, workpiece temperature and nugget size which are indicators of the progress of a weld. The rate of change of flight time is measured and the weld current is adjusted early in the weld cycle to maintain a preset rate of weld growth. The weld current is terminated later in the cycle if the transit time rate falls below another preset value. Otherwise the weld current and termination time follow a standard schedule.
    Type: Grant
    Filed: March 9, 1987
    Date of Patent: December 8, 1987
    Assignee: General Motors Corporation
    Inventors: Umit Bilge, August F. Scarpelli, Ronald E. Schwartz, John J. Ross