Patents by Inventor Robert S. Seymour

Robert S. Seymour 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).

  • Method and apparatus for controlling diameter in Czochralski crystal growth by measuring crystal weight and crystal-melt interface temperature
    Patent number: 4565598
    Abstract: Diameter control in an apparatus and method for growing crystals using the Czochralski technique is accomplished by progressively measuring both the temperature of the melt by a heat sensor and the weight of the residue of the melt in the crucible by a suitable weighing device. The weight measurement data is fed to microprocessor having a control algorithm. The microprocessor output and temperature measurement output are fed to a three-term temperature controller which regulates the temperature of the melt to thereby control automatically the diameter of the crystal. The relationship between an error in weight and the amount of temperature regulation is varied in accordance with a desired weight.
    Type: Grant
    Filed: August 11, 1983
    Date of Patent: January 21, 1986
    Assignee: The Commonwealth of Australia
    Inventor: Robert S. Seymour