Douglas J. Bobrosky

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Alberta, CA

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Patents Grantslast 30 patents

Information Patent Grant
Impregnated rotary drag bit
- Patent number 6,843,333
- Issue date Jan 18, 2005
- Baker Hughes Incorporated
- Volker Richert
- E21 - EARTH DRILLING MINING
Information Patent Grant
Impregnated bit with PDC cutters in cone area
- Patent number 6,510,906
- Issue date Jan 28, 2003
- Baker Hughes Incorporated
- Volker Richert
- E21 - EARTH DRILLING MINING

Patents Applicationslast 30 patents

Information Patent Application
Impregnated rotary drag bit
- Publication number 20030111273
- Publication date Jun 19, 2003
- Volker Richert
- E21 - EARTH DRILLING MINING