Patents by Inventor Donald T. J. Hurle

Donald T. J. Hurle 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 control of crystal growth
    Patent number: 4258003
    Abstract: In crystal growing apparatus in which a crystal is vertically pulled from an electric heated melt the weight of the crystal is measured by a load cell whose output is compared with an expected function to form a control loop for controlling heater power, the improvement comprises a correction circuit for applying to the control loop a signal compensating for a time differential (.lambda.a) of an error signal in the load cell output. The correction circuit may be a feedback or a feed forward loop.
    Type: Grant
    Filed: December 1, 1976
    Date of Patent: March 24, 1981
    Assignee: National Research Development Corporation
    Inventors: Donald T. J. Hurle, Gordon C. Joyce