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:
Nov. 30, 2004
Filed:
Oct. 08, 1999
Applicant:
Inventors:
Olle Claes Erik Kordina, Durham, NC (US);
Michael James Paisley, Garner, NC (US);
Assignee:
Cree, Inc., Durham, NC (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C30B 2/936 ; C30B 2/508 ;
U.S. Cl.
CPC ...
C30B 2/936 ; C30B 2/508 ;
Abstract
A method and apparatus for controlled, extended and repeatable growth of high quality silicon carbide boules of a desired polytype is disclosed which utilizes graphite crucibles coated with a thin coating of a metal carbide and in particular carbides selected from the group consisting of tantalum carbide, hafnium carbide, niobium carbide, titanium carbide, zirconium carbide, tungsten carbide and vanadium carbide.