Lei Cheng

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Shanghai, CN

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Patents Grantslast 30 patents

Information Patent Grant
Lubricator assembly and method for servicing tubular members
- Patent number 11,795,766
- Issue date Oct 24, 2023
- National-Oilwell Varco, L.P.
- Andrew McKenzie
- E21 - EARTH DRILLING MINING

Patents Applicationslast 30 patents

Information Patent Application
LUBRICATOR ASSEMBLY AND METHOD FOR SERVICING TUBULAR MEMBERS
- Publication number 20220003048
- Publication date Jan 6, 2022
- NATIONAL OILWELL VARCO., L.P.
- Andrew McKenzie
- E21 - EARTH DRILLING MINING
Information Patent Application
Multi-Cylinder Hydraulically-Driven Pump System
- Publication number 20150308420
- Publication date Oct 29, 2015
- National-Oilwell Varco, L.P.
- Robert Benjamin Donnally
- F04 - POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS PUMPS FOR LIQUIDS OR ELASTIC...