Patents by Inventor Francoise Kolmer Legoues

Francoise Kolmer Legoues 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: 5810924
    Abstract: A multi-layered structure and process for forming it arc described, incorporating a single crystal substrate, a plurality of epitaxial layers having graded composition wherein the layers have changing lattice spacings not exceeding about 2 percent per 1000 .ANG. of thickness whereby misfit dislocations are formed to relieve strain and then move to the edges of respective layers. The invention overcomes the problem of large numbers of misfit dislocations threading to the surface of the top layer, especially during device processing at temperatures in a range from 700 to 900 degrees Celsius. Fully relaxed, incommensurate structures having low defect densities are obtained, where arbitrary combinations of materials can be used.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: September 22, 1998
    Assignee: International Business Machines Corporation
    Inventors: Francoise Kolmer Legoues, Bernard Steele Meyerson
  • Patent number: 5659187
    Abstract: A multi-layered structure and process for forming it are described, incorporating a single crystal substrate, a plurality of epitaxial layers having graded composition wherein the layers have changing lattice spacings not exceeding about 2 percent per 1000 .ANG. of thickness whereby misfit dislocations are formed to relieve strain and then move to the edges of respective layers. The invention overcomes the problem of large numbers of misfit dislocations threading to the surface of the top layer, especially during device processing at temperatures in a range from 700 to 900 degrees Celsius. Fully relaxed, incommensurate structures having low defect densities are obtained, where arbitrary combinations of materials can be used.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: August 19, 1997
    Assignee: International Business Machines Corporation
    Inventors: Francoise Kolmer Legoues, Bernard Steele Meyerson