Patents by Inventor Lawrence Duane Mason

Lawrence Duane Mason 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).

  • Single crystal ingot and method for growing the same
    Patent number: 5935321
    Abstract: A single crystal ingot (10) is grown by first inserting a single crystal seed (14) into a melt (11) and pulling the seed (14) at a high pulling rate to grow a single crystal neck (15). The pulling rate is then altered to grow an overhang (18) with a diameter greater than that of the single crystal neck (15). An elongated body (19) is formed below the overhang (18) by adjusting the pulling rate. A multi-arm fixture (30) grabs the overhang (18) to alleviate the tensile and torsional stresses in the single crystal neck (15) that may be caused by the weight and the rotational motion of the single crystal ingot (10).
    Type: Grant
    Filed: August 1, 1997
    Date of Patent: August 10, 1999
    Assignee: Motorola, Inc.
    Inventors: Herng-Der Chiou, Lawrence Duane Mason, James B. Hall