Patents by Inventor Bobbie D. Stone

Bobbie D. Stone 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).

  • Apparatus for zone refining
    Patent number: 4201746
    Abstract: Improvements in apparatus for zone refining polycrystalline semiconductor rods to produce monocrystalline semiconductor rods are disclosed. In the apparatus, an inductive heating chamber is employed which has a longitudinal dimension independent of the length of the polycrystalline semiconductor rod to be processed. The longitudinal dimension of the induction heating chamber is limited only by considerations of the space required for the RF induction heating coil and related apparatus which must be mounted within the chamber, the viewing space required for the operator to observe the zone refining process, and the heating effect on the structures above and below the chamber. First and second gas tight bellows are provided which, respectively, surround the rod holder and the seed holder.
    Type: Grant
    Filed: June 13, 1977
    Date of Patent: May 6, 1980
    Assignee: Monsanto Company
    Inventors: John W. Burd, Bobbie D. Stone, William F. Tucker, Kedar P. Gupta
  • Apparatus for zone refining
    Patent number: 4045181
    Abstract: Improvements in apparatus for zone refining polycrystalline semiconductor rods to produce monocrystalline semiconductor rods are disclosed. In the apparatus, an inductive heating chamber is employed which has a longitudinal dimension independent of the length of the polycrystalline semiconductor rod to be processed. The longitudinal dimension of the induction heating chamber is limited only by considerations of the space required for the RF induction heating coil and related apparatus which must be mounted within the chamber, the viewing space required for the operator to observe the zone refining process, and the heating effect on the structures above and below the chamber. First and second gas tight bellows are provided which, respectively, surround the rod holder and the seed holder.
    Type: Grant
    Filed: December 27, 1976
    Date of Patent: August 30, 1977
    Assignee: Monsanto Company
    Inventors: John W. Burd, Bobbie D. Stone, William F. Tucker, Kedar P. Gupta