DB

Duncan M. Butlin

HC Hughes Tool Company: 1 patents #83 of 224Top 40%
📍 Tulsa, OK: #825 of 2,344 inventorsTop 40%
🗺 Oklahoma: #4,502 of 12,736 inventorsTop 40%
Overall (All Time): #2,327,007 of 4,157,543Top 60%
2
Patents All Time

Issued Patents All Time

Showing 1–2 of 2 patents

Patent #TitleCo-InventorsDate
4971522 Control system and method for AC motor driven cyclic load — 1990-11-20
4631535 Submersible pump pressure detection circuit — 1986-12-23