ES

Edward Leigh Schubert

WU Weatherford Holding U.S.: 2 patents #8 of 45Top 20%
📍 Calgary, CA: #1,801 of 5,407 inventorsTop 35%
Overall (All Time): #2,241,732 of 4,157,543Top 55%
2
Patents All Time

Issued Patents All Time

Showing 1–2 of 2 patents

Patent #TitleCo-InventorsDate
6135740 Pump drive head backspin retarder Vern Hult 2000-10-24
6113355 Pump drive head pump assembly with a hydraulic pump circuit for preventing back-spin when the drive head has been shut off Vern Hult 2000-09-05