Patents by Inventor Elden E. Ruhlig

Elden E. Ruhlig 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).

  • Rotary silicon screen
    Patent number: 5165548
    Abstract: The present invention is a device for separating semiconductor grade silicon pieces into desired size ranges, while minimizing contact contamination of the separated pieces. The device employs a rotatable cylindrical screen, with contact surfaces of semiconductor grade silicon. In a preferred embodiment, the cylindrical screen consists of parallel rods of semiconductor grade silicon separated by semiconductor grade silicon, internal, spacers. In addition, external spacers of semiconductor grade silicon are arranged along the length of the parallel rods to further define the exclusion characteristics of the cylindrical screen.
    Type: Grant
    Filed: June 3, 1991
    Date of Patent: November 24, 1992
    Assignee: Hemlock Semiconductor Corporation
    Inventors: Richard C. Dumler, Elden E. Ruhlig, Matthew J. Stavely