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CHANGQING DOWNHOLE TECHNOLOGY OPERATION CO OF CNPC CHUANQING DRILLING ENG CO LTD

Overview
  • Total Patents
    353
  • GoodIP Patent Rank
    5,295
  • Filing trend
    ⇩ 62.0%
About

CHANGQING DOWNHOLE TECHNOLOGY OPERATION CO OF CNPC CHUANQING DRILLING ENG CO LTD has a total of 353 patent applications. It decreased the IP activity by 62.0%. Its first patent ever was published in 2008. It filed its patents most often in China. Its main competitors in its focus markets civil engineering, basic materials chemistry and measurement are GLORI ENERGY INC, TCTM LTD and HIGHLANDS NATURAL RESOURCES PLC.

Patent filings in countries

World map showing CHANGQING DOWNHOLE TECHNOLOGY OPERATION CO OF CNPC CHUANQING DRILLING ENG CO LTDs patent filings in countries
# Country Total Patents
#1 China 353

Patent filings per year

Chart showing CHANGQING DOWNHOLE TECHNOLOGY OPERATION CO OF CNPC CHUANQING DRILLING ENG CO LTDs patent filings per year from 1900 to 2020

Top inventors

# Name Total Patents
#1 Wang Zuwen 113
#2 Zhang Mian 110
#3 Sun Hu 83
#4 Gao Hongping 67
#5 Xu Yingxin 67
#6 Xie Tao 55
#7 Deng Xiaoqiang 54
#8 Su Minwen 53
#9 Bai Mingwei 53
#10 Zhang Wen 52

Latest patents

Publication Filing date Title
CN111042804A Starting device and method for magnetic signal driven mechanical positioner
CN110939422A Horizontal well subsection multi-cluster current-limiting fracturing method with perforation sub-clusters
CN111119805A Automatic oil well swabbing method, device and system
CN111021968A Downhole television washing tool for core-through coiled tubing and implementation method
CN110984978A Low-pressure natural gas well leakage speed mine field rapid evaluation device and method
CN111021988A Control device for drilling string and application
CN111021989A Underground controllable one-way valve and control method
CN111101897A Coiled tubing drilling, drilling and grinding well dredging method and device with screw and application
CN111022035A Oil pipe dragging leakage finding device with bottom seal and method
CN111088956A Magnetorheological fluid-based temporary plugging valve changing device and method for oil-gas wellhead
CN110981040A Fracturing flow-back fluid treatment device and treatment method
CN110965951A Large-drift-diameter hydraulic anchor and using method thereof
CN111019619A Liquid rubber plug temporary plugging slug for shaft isolation and preparation method
CN110905445A Valve leakage controller and method for gas well wellhead
CN110847875A Short-time throttling pipe column and short-time throttling method
CN111189491A Gas-liquid two-phase flow measuring system and method based on ultrasonic waves and radio frequency
CN111305783A Fishing device and fishing method for underground junk
CN110657769A Device and method for automatically measuring length of oil pipe by lifting and lowering oil pipe
CN110793712A Union type pressure sensor high-frequency sampling device
CN110713947A Compound microbial agent for repairing petroleum pollution and preparation method thereof