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Patents Grants
last 30 patents
Information
Patent Grant
Device for handling oil pipes and method for workover
Patent number
9,932,784
Issue date
Apr 3, 2018
China Petroleum and Chemical Corporation
Zenglin Wang
E21 - EARTH DRILLING MINING
Information
Patent Grant
Apparatus for tripping oil pipe and system for automatic well workover
Patent number
9,732,570
Issue date
Aug 15, 2017
China Petroleum and Chemical Corporation
Minxuan Wang
E21 - EARTH DRILLING MINING
Information
Patent Grant
Oil pumping unit
Patent number
8,746,093
Issue date
Jun 10, 2014
China Petroleum and Chemical Corporation
Minxuan Wang
Y10 - TECHNICAL SUBJECTS COVERED BY FORMER USPC
Patents Applications
last 30 patents
Information
Patent Application
DEVICE FOR HANDLING OIL PIPES AND METHOD FOR WORKOVER
Publication number
20160281445
Publication date
Sep 29, 2016
China Petroleum and Chemical Corporation
Zenglin WANG
E21 - EARTH DRILLING MINING
Information
Patent Application
Apparatus for Tripping Oil Pipe and System for Automatic Well Workover
Publication number
20150197997
Publication date
Jul 16, 2015
China Petroleum and Chemical Corporation
Minxuan WANG
E21 - EARTH DRILLING MINING
Information
Patent Application
OIL PUMPING UNIT
Publication number
20110318199
Publication date
Dec 29, 2011
Minxuan WANG
E21 - EARTH DRILLING MINING