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William B. Yelon
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Columbia, MO, US
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Patents Grants
last 30 patents
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Patent Grant
Method of producing gemstone quality topaz
Patent number
5,477,055
Issue date
Dec 19, 1995
Ostro Gems
Kurt Skold
C30 - CRYSTAL GROWTH
Patents Applications
last 30 patents
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Patent Application
Process for improving the color of gemstones and gemstone minerals...
Publication number
20070110924
Publication date
May 17, 2007
William B. Yelon
B44 - DECORATIVE ARTS