Inventor

PIETRAS BERND

DE3 patents

Patents

3 patents

US6668684B2Dec 30, 2003

Tong for wellbore operations

WEATHERFORD LAMB115 citations96

US6412554B1Jul 2, 2002

Wellbore circulation system

WEATHERFORD LAMB178 citations96

US7028787B2Apr 18, 2006

Tong for wellbore operations

WEATHERFORD LAMB19 citations90