Patents by Inventor Edward M. Swiggard

Edward M. Swiggard 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).

  • Patent number: 5057287
    Abstract: A method and apparatus for growing an extended length single crystal of a Group III-V or II-VI material such as GaAs by moving a crucible containing a seed crystal and precompounded crystal material encapsulated in a molten encapsulant preferably vertically in a multi-zone furnace between two furnace zones maintained at temperatures above the melting point of the encapsulant but below the melting point of the crystal material through an intervening short "spike" zone maintained at a temperature at least equal to the melting temperature of the crystal material to crystallize the precompounded crystal material with the seed crystal, and tipping the crucible in the furnace, e.g. by tipping the furnace with the crucible in it, to decant the encapsulant prior to recovering the crystal.
    Type: Grant
    Filed: August 8, 1990
    Date of Patent: October 15, 1991
    Assignee: SFA, Inc.
    Inventor: Edward M. Swiggard
  • Patent number: 5007980
    Abstract: A method and apparatus for growing an extended length single crystal of a Group III-V or II-VI material such as GaAs by moving a crucible containing a seed crystal and precompounded crystal material encapsulated in a molten encapsulant preferably vertically in a multi-zone furnace between two furnace zones maintained at temperatures above the melting point of the encapsulant but below the melting point of the crystal material through an intervening short "spike" zone maintained at a temperature at least equal to the melting temperature of the crystal material to crystallize the precompounded crystal material with the seed crystal, and tipping the crucible in the furnace, e.g. by tipping the furnace with the crucible in it, to decant the encapsulant prior to recovering the crystal.
    Type: Grant
    Filed: November 1, 1988
    Date of Patent: April 16, 1991
    Assignee: SFA, Inc.
    Inventor: Edward M. Swiggard