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Dagobert Feld
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Hanover, DE
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last 30 patents
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Patent Grant
Drilling tool for sinking wells in underground rock formations
Patent number
5,168,941
Issue date
Dec 8, 1992
Baker Hughes Incorporated
Volker Krueger
E21 - EARTH DRILLING MINING
Information
Patent Grant
Directional drilling tool apparatus and method
Patent number
5,156,222
Issue date
Oct 20, 1992
Baker Hughes Incorporated
Rainer Jurgens
E21 - EARTH DRILLING MINING
Information
Patent Grant
Double guided mud pulse valve
Patent number
5,040,155
Issue date
Aug 13, 1991
Baker Hughes Incorporated
Dagobert Feld
E21 - EARTH DRILLING MINING
Information
Patent Grant
Apparatus for the generation of pressure pulses in drilling mud com...
Patent number
4,901,290
Issue date
Feb 13, 1990
Eastman Christensen Company
Dagobert Feld
E21 - EARTH DRILLING MINING