Inventor
KELLNER JACKSON M
US12 patents
Patents
12 patentsUS4040494AAug 9, 1977
Drill director
SMITH INTERNATIONAL100 citations95
US4067596AJan 10, 1978
Dual flow passage drill stem
SMITH INTERNATIONAL72 citations92
US4040495AAug 9, 1977
Drilling apparatus
SMITH INTERNATIONAL50 citations92
US4211291AJul 8, 1980
Drill fluid powered hydraulic system
SMITH INTERNATIONAL25 citations81
US4102552AJul 25, 1978
Tandem eccentric roller stabilizer for earth boring apparatus
SMITH INTERNATIONAL26 citations81
US3997008ADec 14, 1976
Drill director
SMITH INTERNATIONAL28 citations81
US4522234AJun 11, 1985
Multiple conduit drill pipe
SMITH INTERNATIONAL8 citations73
US4244433AJan 13, 1981
Safety mechanism for a raise drill
SMITH INTERNATIONAL10 citations73
US4082373AApr 4, 1978
Tandem roller stabilizer for earth boring apparatus
SMITH INTERNATIONAL14 citations73
US4071285AJan 31, 1978
Stabilizer
SMITH INTERNATIONAL6 citations73
US4142593AMar 6, 1979
Raise drill inner yoke bridge
SMITH INTERNATIONAL7 citations72
US4195701AApr 1, 1980
Raise drill having water passages directed toward the roller cutters
SMITH INTERNATIONAL2 citations59