Assignee
ALHAUG ESPEN
NO4 patents
Top patents by PatentIndex Score
US8770628B2Jul 8, 2014
Seal assembly for nested dual drill pipe
ALHAUG ESPEN5 citations68
US9169715B2Oct 27, 2015
Down hole well tool provided with a piston
ALHAUG ESPEN0 citations37
US9267344B2Feb 23, 2016
Actuator for dual drill string valve and drill string valve configurations therefore
ALHAUG ESPEN0 citations33
US8997871B2Apr 7, 2015
Actuator for dual drill string valve and rotary drill string valve configuration therefor
ALHAUG ESPEN0 citations33