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:
Mar. 03, 1998
Filed:
Oct. 30, 1996
Applicant:
Inventors:
Charles Eric Hunter, Raleigh, NC (US);
Dirk Verbiest, Carrboro, NC (US);
Assignee:
C3, Inc., Morrisville, NC (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C30B / ; C04B / ;
U.S. Cl.
CPC ...
501 86 ; 501 88 ; 63 32 ; 117951 ;
Abstract
Synthetic gemstones having extraordinary brilliance and hardness are formed from large single crystals of relatively low impurity, translucent silicon carbide of a single polytype that are grown in a furnace sublimation system. The crystals are cut into rough gemstones that are thereafter fashioned into finished gemstones. A wide range of colors and shades is available by selective doping of the crystal during growth. A colorless gemstone is produced by growing the crystal undoped in a system substantially free of unwanted impurity atoms.