DO

David L. O'Donnell

VS Varco Shaffer: 3 patents #2 of 18Top 15%
Overall (All Time): #1,646,852 of 4,157,543Top 40%
3
Patents All Time

Issued Patents All Time

Patent #TitleCo-InventorsDate
5575452 Blowout preventer with ram wedge locks Melvyn F. Whitby, Frank L. Sklenka 1996-11-19
5505426 Hydraulically controlled blowout preventer Melvyn F. Whitby, Tri C. Le 1996-04-09
5400857 Oilfield tubular shear ram and method for blowout prevention Melvyn F. Whitby 1995-03-28