FP

Francis E. Phelps

DI Dresser Industries: 2 patents #157 of 787Top 20%
📍 Dallas, TX: #3,077 of 7,543 inventorsTop 45%
🗺 Texas: #52,441 of 125,132 inventorsTop 45%
Overall (All Time): #2,372,812 of 4,157,543Top 60%
2
Patents All Time

Issued Patents All Time

Showing 1–2 of 2 patents

Patent #TitleCo-InventorsDate
4220377 Earth boring bit with eccentrically machined bearing pin — 1980-09-02
4187922 Varied pitch rotary rock bit — 1980-02-12