Ralph William Graeme JOHNS

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Edmonton, CA

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Patents Grantslast 30 patents

Information Patent Grant
Method and apparatus for controlling downhole rotational rate of a...
- Patent number 9,963,937
- Issue date May 8, 2018
- Dreco Energy Services ULC
- Jonathan Ryan Prill
- E21 - EARTH DRILLING MINING
Information Patent Grant
Method and apparatus for controlling downhole rotational rate of a...
- Patent number 9,822,587
- Issue date Nov 21, 2017
- Dreco Energy Services ULC
- Jonathan Ryan Prill
- E21 - EARTH DRILLING MINING
Information Patent Grant
Method and apparatus for controlling downhole rotational rate of a...
- Patent number 9,206,647
- Issue date Dec 8, 2015
- Dreco Energy Services ULC
- Jonathan Ryan Prill
- E21 - EARTH DRILLING MINING

Patents Applicationslast 30 patents

Information Patent Application
METHOD AND APPARATUS FOR CONTROLLING DOWNHOLE ROTATIONAL RATE OF A...
- Publication number 20160084004
- Publication date Mar 24, 2016
- DRECO ENERGY SERVICES ULC
- Jonathan Ryan PRILL
- E21 - EARTH DRILLING MINING
Information Patent Application
METHOD AND APPARATUS FOR CONTROLLING DOWNHOLE ROTATIONAL RATE OF A...
- Publication number 20150240580
- Publication date Aug 27, 2015
- DRECO ENERGY SERVICES ULC
- Jonathan Ryan PRILL
- E21 - EARTH DRILLING MINING