CHARLES & COLVARD, LTD.

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Patent Activity in the Last 10 Years

Technologies

Intl Class Technology Matters Rank in Class
 
  
 
C01B NON-METALLIC ELEMENTS; COMPOUNDS THEREOF178
 
  
 
C04B LIME; MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS 167
 
  
 
C30B SINGLE-CRYSTAL GROWTH 155

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Recent Publications

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Recent Patents

Patent # Title Filing Date Issue Date Intl Class
5762896 Silicon carbide gemstonesAug 31, 95Jun 09, 98[C01B]
5723391 Silicon carbide gemstonesOct 30, 96Mar 03, 98[C04B, C30B]

Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
2009/0056,374 Gemstone Facet ConfigurationAbandonedAug 31, 07Mar 05, 09[A44C, C30B]
5955735 Apparatus and method for positively identifying synthetic silicon carbide gemstonesExpiredSep 29, 97Sep 21, 99[G01N, G01R]
5882786 Gemstones formed of silicon carbide with diamond coatingExpiredNov 15, 96Mar 16, 99[B32B]
5835205 Optical testing system for distinguishing a silicon carbide gemstone from a diamondExpiredFeb 10, 97Nov 10, 98[G01N]

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