Patents by Inventor Jim E. Chemans

Jim E. Chemans 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).

  • Crystal growth method
    Patent number: 4923561
    Abstract: In a vertical gradient freeze (VGF) process for growing a large crystal of a Group III-V compound semiconductor in a pyrolytic boron nitride crucible (11), a major part of the inner surface of the crucible is first oxidized to form a boric oxide layer (12).
    Type: Grant
    Filed: September 23, 1988
    Date of Patent: May 8, 1990
    Assignee: American Telephone and Telegraph Company
    Inventors: Jim E. Chemans, Eric M. Monberg