Hilbert D. Dahl — 2 Patents at Conoco

Hilbert D. Dahl has been granted 2 US patents while listed as an inventor at Conoco. The first was granted in 1981 and the most recent in April 1983. Hilbert D. Dahl ranks #1,709,992 of 4,157,543 US inventors in our database (top 41.1%). Patent records list Hilbert D. Dahl in Pittsburgh, PA, US.

Issued Patents All Time

Showing 1–2 of 2 patents

Patent #	Title	Co-Inventors	Date
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

Hilbert D. Dahl — 2 Patents

Issued Patents All Time

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