JD

Jay C. Duhn

DT Duhn Oil Tool: 2 patents #3 of 7Top 45%
SP Shell Western E & P: 1 patents #10 of 35Top 30%
📍 Bakersfield, CA: #240 of 840 inventorsTop 30%
🗺 California: #185,134 of 386,348 inventorsTop 50%
Overall (All Time): #2,293,703 of 4,157,543Top 60%
2
Patents All Time

Issued Patents All Time

Showing 1–2 of 2 patents

Patent #TitleCo-InventorsDate
5303774 Ring seal packer Rex E. Duhn, Kenneth D. Webster, Aaron B. Speirs 1994-04-19
4974676 Ground subsiding wellhead Rex E. Duhn, William D. Chapman 1990-12-04