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Hilbert D. Dahl

CO Conoco: 2 patents #177 of 638Top 30%
📍 Pittsburgh, PA: #3,179 of 7,570 inventorsTop 45%
🗺 Pennsylvania: #30,495 of 74,527 inventorsTop 45%
Overall (All Time): #2,362,040 of 4,157,543Top 60%
2
Patents All Time

Issued Patents All Time

Showing 1–2 of 2 patents

Patent #TitleCo-InventorsDate
4381161 Slurry recovery from a circular sump Richard E. Doerr, Ronald W. Umphrey 1983-04-26
4305474 Thrust actuated drill guidance device Nathandale Farris 1981-12-15