Optics: measuring and testing – Crystal or gem examination
Reexamination Certificate
2008-05-22
2009-08-25
Lauchman, L. G (Department: 2877)
Optics: measuring and testing
Crystal or gem examination
Reexamination Certificate
active
07580118
ABSTRACT:
Methods for grading gemstones, apparatus for grading gemstones, and systems that utilize such methods and apparatus are disclosed.
REFERENCES:
patent: 5966673 (1999-10-01), Shannon, Sr.
patent: 7372552 (2008-05-01), Sasian et al.
Caudill James
Sasian Jose
Yantzer Peter
American Gem Society
Lauchman L. G
Lewis, Rice & Fingersh L.C.
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