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John Cannell
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Houston, TX, US
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last 30 patents
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Patent Grant
Hands free gooseneck with rotating cartridge assemblies
Patent number
9,611,704
Issue date
Apr 4, 2017
National-Oilwell Varco, L.P.
Frank Springett
E21 - EARTH DRILLING MINING
Patents Applications
last 30 patents
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Patent Application
HANDS FREE GOOSENECK WITH ROTATING CARTRIDGE ASSEMBLIES
Publication number
20140083711
Publication date
Mar 27, 2014
National-Oilwell Varco, L.P.
Frank Springett
E21 - EARTH DRILLING MINING