Inventor
FIELDER COY M
US18 patents
⚠️ This page may combine multiple inventors who share the name “FIELDER COY M”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
DIAMOND PRODUCTS INTERNATIONAL
10 patentsUS6340064B2Jan 22, 2002
Bi-center bit adapted to drill casing shoe
DIAMOND PRODUCTS INTERNATIONAL150 citations97
US5979577ANov 9, 1999
Stabilizing drill bit with improved cutting elements
DIAMOND PRODUCTS INTERNATIONAL89 citations96
US5803196ASep 8, 1998
Stabilizing drill bit
DIAMOND PRODUCTS INTERNATIONAL77 citations96
US6068072AMay 30, 2000
Cutting element
DIAMOND PRODUCTS INTERNATIONAL57 citations94
US6142248ANov 7, 2000
Reduced erosion nozzle system and method for the use of drill bits to reduce erosion
DIAMOND PRODUCTS INTERNATIONAL91 citations93
US6412579B2Jul 2, 2002
Two stage drill bit
DIAMOND PRODUCTS INTERNATIONAL36 citations92
US6401845B1Jun 11, 2002
Cutting element with stress reduction
DIAMOND PRODUCTS INTERNATIONAL40 citations92
US5992548ANov 30, 1999
Bi-center bit with oppositely disposed cutting surfaces
DIAMOND PRODUCTS INTERNATIONAL133 citations92
US6629476B2Oct 7, 2003
Bi-center bit adapted to drill casing shoe
DIAMOND PRODUCTS INTERNATIONAL35 citations91
US6026919AFeb 22, 2000
Cutting element with stress reduction
DIAMOND PRODUCTS INTERNATIONAL48 citations90
CHRISTENSEN INC
4 patentsUS4351401ASep 28, 1982
Earth-boring drill bits
CHRISTENSEN INC216 citations99
US4244432AJan 13, 1981
Earth-boring drill bits
CHRISTENSEN INC71 citations95
US4073354AFeb 14, 1978
Earth-boring drill bits
CHRISTENSEN INC106 citations94
US4336850AJun 29, 1982
Internal fluid screen to prevent nozzle and port plugging
CHRISTENSEN INC17 citations74