Zeming Qin

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Guangzhou, CN

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Patents Grantslast 30 patents

Information Patent Grant
Slip sealing structure
- Patent number 11,112,039
- Issue date Sep 7, 2021
- GUANGZHOU JST SEALS TECHNOLOGY CO., LTD.
- Zeming Qin
- F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...

Patents Applicationslast 30 patents

Information Patent Application
SEAL FOR REPEATEDLY SWITCHABLE STEPLESS FRACTURING SLIDING SLEEVE
- Publication number 20240125209
- Publication date Apr 18, 2024
- GUANGZHOU JST SEALS TECHNOLOGY CO., LTD.
- Zeming Qin
- E21 - EARTH DRILLING MINING
Information Patent Application
SLIP SEALING STRUCTURE
- Publication number 20200378533
- Publication date Dec 3, 2020
- GUANGZHOU JST SEALS TECHNOLOGY CO., LTD.
- Zeming Qin
- E21 - EARTH DRILLING MINING