Granted Patent
Utility
US 5,835,205 · App. 08/795,228
Optical testing system for distinguishing a silicon carbide gemstone from a diamond
Inventors:
Charles Eric Hunter, Douglas G. Waltz
Patented Case
View Patent ↗
Granted: Nov 10, 1998
Filed: Feb 10, 1997
Inventors
Charles Eric Hunter
Douglas G. Waltz
Assignee (at issue)
C3 Corporation
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.