Leslie Howell

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Elk City, OK, US

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Patents Grantslast 30 patents

Information Patent Grant
Retrievable back pressure valve and method of using same
- Patent number 11,220,883
- Issue date Jan 11, 2022
- Belo Kellam
- E21 - EARTH DRILLING MINING
Information Patent Grant
Retrievable back pressure valve and method of using same
- Patent number 10,626,701
- Issue date Apr 21, 2020
- Belo Kellam
- E21 - EARTH DRILLING MINING
Information Patent Grant
Retrievable back pressure valve and method of using same
- Patent number 10,113,391
- Issue date Oct 30, 2018
- Belo Kellam
- E21 - EARTH DRILLING MINING
Information Patent Grant
Retrievable back pressure valve and method of using same
- Patent number 9,863,213
- Issue date Jan 9, 2018
- Hybrid Tools Solutions LLC
- Belo Kellam
- E21 - EARTH DRILLING MINING