Hongyin WEI

Follow

Person

Tianjin, CN

People

Patents Grantslast 30 patents

Information Patent Grant
Pressure compensation device with accumulator group for controlled...
- Patent number 12,000,222
- Issue date Jun 4, 2024
- CNPC BOHAI DRILING ENGINEERING COMPANY LIMITED
- Jinshan Ma
- G05 - CONTROLLING REGULATING

Patents Applicationslast 30 patents

Information Patent Application
PRESSURE COMPENSATION DEVICE WITH ACCUMULATOR GROUP FOR CONTROLLED...
- Publication number 20230228162
- Publication date Jul 20, 2023
- CNPC BOHAI DRILING ENGINEERING COMPANY LIMITED
- Jinshan MA
- E21 - EARTH DRILLING MINING