Inventor
SPAAR JOHN R
US3 patents
Patents
3 patentsUS6321862B1Nov 27, 2001
Rotary drill bits for directional drilling employing tandem gage pad arrangement with cutting elements and up-drill capability
BAKER HUGHES INC84 citations97
US6006845ADec 28, 1999
Rotary drill bits for directional drilling employing tandem gage pad arrangement with reaming capability
BAKER HUGHES INC32 citations91
US6112836ASep 5, 2000
Rotary drill bits employing tandem gage pad arrangement
BAKER HUGHES INC16 citations83