Dale Hankins

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Bakersfield, CA, US

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Patents Grantslast 30 patents

Information Patent Grant
Superimposed standing valve
- Patent number 10,519,949
- Issue date Dec 31, 2019
- Dale Hankins
- E21 - EARTH DRILLING MINING
Information Patent Grant
Superimposed standing valve
- Patent number 10,132,312
- Issue date Nov 20, 2018
- Dale Hankins
- E21 - EARTH DRILLING MINING
Information Patent Grant
Propping material for hydraulic fracturing
- Patent number 4,051,900
- Issue date Oct 4, 1977
- Dale Hankins
- E21 - EARTH DRILLING MINING