Marvin Gearhart

Follow

Person

Forth Worth, TX, US

People

Patents Grantslast 30 patents

Information Patent Grant
Air and mud control system for underbalanced drilling
- Patent number 5,873,420
- Issue date Feb 23, 1999
- Marvin Gearhart
- E21 - EARTH DRILLING MINING
Information Patent Grant
Telemetry system involving gigahertz transmission in a gas filled t...
- Patent number 5,831,549
- Issue date Nov 3, 1998
- Marvin Gearhart
- E21 - EARTH DRILLING MINING
Information Patent Grant
Roller cone core bit with spiral stabilizers
- Patent number 5,289,889
- Issue date Mar 1, 1994
- Marvin Gearhart
- E21 - EARTH DRILLING MINING