HUGHES CHRISTENSEN COMPANY

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Patent Activity in the Last 10 Years

Technologies

Intl Class Technology Matters Rank in Class
 
 
 
E21B EARTH OR ROCK DRILLING 492
 
 
 
H03M CODING, DECODING OR CODE CONVERSION, IN GENERAL 1110

Top Patents (by citation)

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Recent Publications

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Recent Patents

Patent # Title Filing Date Issue Date Intl Class
5402124 Encoder and decoder with improved quantizer using reserved quantizer level for small amplitude signalsNov 25, 92Mar 28, 95[H03M]
5360076 Dual metal face seal with single recessed energizerApr 03, 92Nov 01, 94[E21B]
5323865 Earth-boring bit with an advantageous insert cutting structureDec 17, 92Jun 28, 94[E21B]
5307887 Earth boring bit with improved thrust bearingJul 30, 92May 03, 94[E21B]
5287936 Rolling cone bit with shear cutting gageJan 31, 92Feb 22, 94[E21B]

Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5348108 Rolling cone bit with improved wear resistant insertsExpiredJun 08, 92Sep 20, 94[E21B]
5281260 High-strength tungsten carbide material for use in earth-boring bitsExpiredFeb 28, 92Jan 25, 94[C22C]
5273125 Fixed cutter bit with improved diamond filled compactsExpiredMay 07, 92Dec 28, 93[E21B]
5248006 Rotary rock bit with improved diamond-filled compactsExpiredMay 07, 92Sep 28, 93[E21B]

Top Inventors for This Owner

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