David W. Ashcraft

Follow

Person

Katy, TX, US

People

Patents Grantslast 30 patents

Information Patent Grant
Rotary coring device and method for acquiring a sidewall core from...
- Patent number 7,530,407
- Issue date May 12, 2009
- Baker Hughes Incorporated
- Borislav Tchakarov
- E21 - EARTH DRILLING MINING
Information Patent Grant
Self cleaning coring bit
- Patent number 7,373,994
- Issue date May 20, 2008
- Baker Hughes Incorporated
- Borislav J. Tchakarov
- E21 - EARTH DRILLING MINING

Patents Applicationslast 30 patents

Information Patent Application
Rotary coring device and method for acquiring a sidewall core from...
- Publication number 20070045005
- Publication date Mar 1, 2007
- Borislav Tchakarov
- E21 - EARTH DRILLING MINING
Information Patent Application
Self cleaning coring bit
- Publication number 20060076162
- Publication date Apr 13, 2006
- BAKER HUGHES, INCORPORATED
- Borislav J. Tchakarov
- E21 - EARTH DRILLING MINING