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Bobby L. Douglas

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Dual sealing element valve for oil well pumps and method of...

F - Mech Eng,Light,Heat,Weapons – 16 – K
Patent

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Floating piston for selective hydraulic packer

E - Fixed Constructions – 21 – B
Patent

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Floating piston for selective hydraulic packer

E - Fixed Constructions – 21 – B
Patent

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Gas lift valve

E - Fixed Constructions – 21 – B
Patent

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Oil well pump having gas lock prevention means

F - Mech Eng,Light,Heat,Weapons – 04 – B
Patent

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Profile ID: LFCA-PAI-P-132318

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