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. 10, 1998
Filed:
Feb. 10, 1997
Applicant:
Inventors:
Charles Eric Hunter, Hilton Head Island, SC (US);
Douglas G Waltz, Durham, NC (US);
Assignee:
C3, Inc., Morrisville, NC (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01N / ; G01N / ;
U.S. Cl.
CPC ...
356 30 ; 356432 ;
Abstract
Diamond gemstones and gemstones formed of crystals of silicon carbide are distinguished from each other by introducing a band of ultraviolet light into a target gemstone and measuring the transmissivity of that band of light by the gemstone. A diamond will transmit light within a certain band of the ultraviolet spectrum, while a silicon carbide gemstone will block light within this band. Several instruments for carrying out this procedure are described, including an instrument that utilizes a fiberoptic strand to convey ultraviolet light that has passed through the gemstone to a solid state photodetector.