Mark C. Ehlert

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Duncan, OK, US

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Patents Grantslast 30 patents

Information Patent Grant
Pressure control apparatus and method
- Patent number 4,990,076
- Issue date Feb 5, 1991
- Halliburton Company
- Michael J. Lynch
- G05 - CONTROLLING REGULATING
Information Patent Grant
Valve, and set point pressure controller utilizing the same
- Patent number 4,917,349
- Issue date Apr 17, 1990
- Halliburton Company
- Jim B. Surjaatmadja
- G05 - CONTROLLING REGULATING
Information Patent Grant
Fluid testing apparatus and method
- Patent number 4,829,811
- Issue date May 16, 1989
- Halliburton Company
- Mark C. Ehlert
- G01 - MEASURING TESTING
Information Patent Grant
Consistency and static gel strength measuring device and method
- Patent number 4,622,846
- Issue date Nov 18, 1986
- Halliburton Company
- John J. Moon
- G01 - MEASURING TESTING