John McHardy

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Patents Grantslast 30 patents

Information Patent Grant
System for controlling wellbore pressure during pump shutdowns
- Patent number 11,149,506
- Issue date Oct 19, 2021
- Expro Americas, LLC
- Danny Spencer
- E21 - EARTH DRILLING MINING

Patents Applicationslast 30 patents

Information Patent Application
A SYSTEM FOR CONTROLLING WELLBORE PRESSURE DURING PUMP SHUTDOWNS
- Publication number 20170089156
- Publication date Mar 30, 2017
- Power Chokes
- Danny Spencer
- E21 - EARTH DRILLING MINING