TO

T. B. O'Brien

FL Flowdril: 1 patents #3 of 9Top 35%
Overall (All Time): #3,981,531 of 4,157,543Top 100%
1
Patents All Time

Issued Patents All Time

Patent #TitleCo-InventorsDate
4691790 Method and apparatus for removing the inner conduit from a dual passage drill string James M. Reichman, Michael C. McDonald 1987-09-08