Inventor

STUBSTAD SVEIN

US3 patents

⚠️ This page may combine multiple inventors who share the name “STUBSTAD SVEIN”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.

VARCO INT

1 patent

US7487848B2Feb 10, 2009

Multi-seal for top drive shaft

VARCO INT21 citations89

VARCO I P

1 patent

US7401664B2Jul 22, 2008

Top drive systems

VARCO I P16 citations89

NAT OILWELL VARCO LP

1 patent

US7748473B2Jul 6, 2010

Top drives with shaft multi-seal

NAT OILWELL VARCO LP26 citations88