Patents by Inventor Alexandr Dimitrievich Roenkov

Alexandr Dimitrievich Roenkov 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).

  • Publication number: 20020023581
    Abstract: A low dislocation density silicon carbide (SiC) is provided as well as an apparatus and method for growing the same. The SiC crystal, grown using sublimation techniques, is preferably divided into two stages of growth. During the first stage of growth, the crystal grows in a normal direction while simultaneously expanding laterally. Although dislocations and other material defects may propagate within the axially grown material, defect propagation and generation in the laterally grown material are substantially reduced, if not altogether eliminated. After the crystal has expanded to the desired diameter, the second stage of growth begins in which lateral growth is suppressed and normal growth is enhanced. A substantially reduced defect density is maintained within the axially grown material that is based on the laterally grown first stage material.
    Type: Application
    Filed: February 14, 2001
    Publication date: February 28, 2002
    Inventors: Yury Alexandrovich Vodakov, Mark Grigorievich Ramm, Evgency Nikolaovich Mokhov, Alexandr Dimitrievich Roenkov, Yury Nikolaevich Makarov, Sergei Yurievich Karpov, Mark Spiridonovich Ramm, Heikki I. Helava