Inventor
PAPKE DUANE D
CA4 patents
Patents
4 patentsUS4792000ADec 20, 1988
Method and apparatus for well drilling
OIL PATCH GROUP INC77 citations94
US4776410AOct 11, 1988
Stabilizing tool for well drilling
OIL PATCH GROUP INC44 citations90
US4765417AAug 23, 1988
Reaming apparatus for well drilling
OIL PATCH GROUP INC31 citations90
US4709462ADec 1, 1987
Method for assembling a well drilling tool
OIL PATCH GROUP INC33 citations90