E21B 1/38

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Patent/Pub #TitleFiling DateIssue/Publication DatePatent Owner
9937613 Striker member, and a drilling machine comprising a striker memberApr 12, 12Apr 10, 18Atlas Copco Rock Drills AB
9279232 Front head nut pocket configuration for hydraulic hammerOct 12, 12Mar 08, 16CATERPILLAR INC.
9132541 Pneumatic hammer mechanism and control methodJan 29, 10Sep 15, 15HILTI AKTIENGESELLSCHAFT
9016396 Percussion device and rock drilling machineSep 28, 07Apr 28, 15ATLAS COPCO ROCK DRILLS AB
8800690 Down-the-hole drill hammer having a reverse exhaust system and segmented chuck assemblyNov 18, 09Aug 12, 14CENTER ROCK, INC.
8783377 Hand-held power tool, particularly a rotary and/or chisel hammer, having a vibration absorbing unitOct 17, 08Jul 22, 14ROBERT BOSCH GMBH
8302707 Down-the-hole drill reverse exhaust systemJan 28, 09Nov 06, 12CENTER ROCK, INC.
8096368 Fence post installation and anchoring systemJan 14, 10Jan 17, 12Not available
8006784 Backhead and drill assembly with backheadJun 29, 09Aug 30, 11ROCKMORE INTERNATIONAL, INC.
7748478 Percussion drilling assembly and hammer bit with an adjustable chokeJul 21, 08Jul 06, 10SMITH INTERNATIONAL, INC.
7207633 Scaling assemblyOct 07, 04Apr 24, 07ASTEC INDUSTRIES, INC.
6698537 Bit retention systemDec 05, 01Mar 02, 04NUMA TOOL COMPANY