Licheng YU

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Daqing, Heilongjiang, CN

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Patents Grantslast 30 patents

Information Patent Grant
Wellhead sealing device of sucker-rod pumping machine
- Patent number 11,261,687
- Issue date Mar 1, 2022
- Licheng Yu
- F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
Information Patent Grant
Wellhead sealing device of sucker-rod pumping machine
- Patent number 10,760,367
- Issue date Sep 1, 2020
- Licheng Yu
- F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...

Patents Applicationslast 30 patents

Information Patent Application
WELLHEAD SEALING DEVICE OF SUCKER-ROD PUMPING MACHINE
- Publication number 20200399972
- Publication date Dec 24, 2020
- Licheng YU
- E21 - EARTH DRILLING MINING
Information Patent Application
WELLHEAD SEALING DEVICE OF SUCKER-ROD PUMPING MACHINE
- Publication number 20190017342
- Publication date Jan 17, 2019
- Licheng YU
- E21 - EARTH DRILLING MINING