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Patents Grants
last 30 patents
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Patent Grant
Oil pumping unit with pinion reciprocating on rack
Patent number
9,651,124
Issue date
May 16, 2017
Xinyi Gu
E21 - EARTH DRILLING MINING
Information
Patent Grant
Well rig lift system and a hydraulic energy-storing well rig lift s...
Patent number
5,390,747
Issue date
Feb 21, 1995
Drilling Technology Research Institute of Shengli Oilfield
Xinyi Gu
E21 - EARTH DRILLING MINING
Patents Applications
last 30 patents
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Patent Application
OIL PUMPING UNIT WITH PINION RECIPROCATING ON RACK
Publication number
20140238160
Publication date
Aug 28, 2014
Xinyi Gu
F04 - POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS PUMPS FOR LIQUIDS OR ELASTIC...