JF

Joseph L. Frederick

HY Hydril: 2 patents #45 of 135Top 35%
Overall (All Time): #2,286,056 of 4,157,543Top 55%
2
Patents All Time

Issued Patents All Time

Patent #TitleCo-InventorsDate
5407172 Position instrumented blowout preventer Kenneth D. Young, Kenneth W. Colvin 1995-04-18
5320325 Position instrumented blowout preventer Kenneth D. Young, Kenneth W. Colvin 1994-06-14