The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 01, 2008
Filed:
Oct. 12, 2005
Robert Tyler Leonard, Raleigh, NC (US);
Adrian Powell, Apex, NC (US);
Stephan Georg Mueller, Durham, NC (US);
Valeri F. Tsvetkov, Durham, NC (US);
Robert Tyler Leonard, Raleigh, NC (US);
Adrian Powell, Apex, NC (US);
Stephan Georg Mueller, Durham, NC (US);
Valeri F. Tsvetkov, Durham, NC (US);
Cree, Inc., Durham, NC (US);
Abstract
A method of producing a high quality bulk single crystal of silicon carbide in a seeded growth system is disclosed. The method includes positioning the seed crystal in a crucible while exerting minimal torsional forces on the seed crystal to thereby prevent torsional forces from warping or bowing the seed crystal in a manner that that would otherwise encourage sublimation from the rear of the seed crystal or undesired thermal differences across the seed crystal.