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China Oilfield Services, Limited

USPTO Granted Patents = 23

CIPO Patents = 1

Trademarks = 1

Forward Citations = 12

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77 inventors (with patents filed for the assignee):

Yongren Feng (18 out of 18 patents)

Tiemin Liu (9 out of 9 patents)

Xiaodong Chu (9 out of 9 patents)

4. Zhibin Tian (9 out of 9 patents)

5. Lin Huang (9 out of 9 patents)

6. Zanqing Wei (8 out of 8 patents)

7. Xingfang Wu (7 out of 7 patents)

8. Tao Lu (7 out of 7 patents)

9. Yong Jiang (5 out of 5 patents)

10. Minggao Zhou (4 out of 4 patents)

11. Guiqing Hao (4 out of 4 patents)

12. Xiaofei Qin (4 out of 4 patents)

13. Qiang Yu (3 out of 15 patents)

14. Yongzeng Xue (3 out of 3 patents)

15. Jibin Zou (3 out of 3 patents)

23 patents: Sort by Forward Citations

1. 12359519 - Coring and sampling integrated sub and downhole instrument (2025-07-15),

2. 12320942 - Sensor module, sensor assembly and acoustic logging tool (2025-06-03),

3. 12235194 - Coring device (2025-02-25),

4. 12188919 - Method and system for measuring composition and property of formation fluid (2025-01-07),

5. 12025159 - Hydraulic power system for downhole device and downhole device (2024-07-02),

6. 12012816 - Core detection device of coring instrument and spacer insertion device (2024-06-18),

7. 11927713 - Method, device and medium for acquiring logging parameters (2024-03-12),

8. 11905829 - Integrated logging instrument for coring and sampling (2024-02-20),

9. 11788405 - Downhole oil level detection device (2023-10-17),

10. 11739603 - Core detection device of coring instrument (2023-08-29),

11. 11624244 - Connecting structure for drill collar of logging while drilling instrument and drill collar sub male and female joints (2023-04-11),

12. 11072981 - Sampling-by-pushing system and setting method thereof (2021-07-27),

13. 11028658 - Horizontal-to-vertical drilling module for deep well (2021-06-08),

14. 10381899 - Sidewall coring structure directly driven by an electric motor (2019-08-13),

15. 10236667 - Wire follow-up protection structure of electric reducer (2019-03-19),

China Oilfield Services Limited (COSL) is a leading integrated oilfield services provider. It specializes in the exploration, development, and production of oil and gas resources. With extensive experience and advanced technology, COSL offers a wide range of services including drilling services, well completion services, offshore support services, and geophysical survey. Headquartered in Beijing, China, COSL operates globally with a strong focus on the Chinese offshore market.

This text is generated by artificial intelligence and may not be accurate.

Company Badge

USPTO Data Jan 1 1976 - Dec 23 2025

23 Patents

#13 in Tianjin

#1,153 in China

#26,807 in the World

China Oilfield Services, Limited

Forward Citations = 12

77 inventors:

Yongren Feng (18 out of 18 patents)

Tiemin Liu (9 out of 9 patents)

Xiaodong Chu (9 out of 9 patents)

4. Zhibin Tian (9 out of 9 patents)

5. Lin Huang (9 out of 9 patents)

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