Daniel Schofield

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Calgary, CA

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Patents Grantslast 30 patents

Information Patent Grant
Dual-stage valve straddle packer for selective stimulation of wells
- Patent number 7,789,163
- Issue date Sep 7, 2010
- Extreme Energy Solutions, Inc.
- Robert Kratochvil
- E21 - EARTH DRILLING MINING

Patents Applicationslast 30 patents

Information Patent Application
Dual-stage valve straddle packer for selective stimulation of wells
- Publication number 20090159299
- Publication date Jun 25, 2009
- Robert Kratochvil
- E21 - EARTH DRILLING MINING
Information Patent Application
Staged Actuation Shear Sub for Use Downhole
- Publication number 20090145605
- Publication date Jun 11, 2009
- Robert Bohuslav Kratochvil
- E21 - EARTH DRILLING MINING