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China Oilfield Services, Limited

USPTO Granted Patents = 24

% Expired Patents = 8.3

CIPO Patents = 1

Trademarks = 1

Forward Citations = 12

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89 inventors (with patents filed for the assignee):

Yongren Feng (18 out of 18 patents)

Lin Huang (10 out of 10 patents)

Tiemin Liu (9 out of 9 patents)

4. Xiaodong Chu (9 out of 9 patents)

5. Zhibin Tian (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. Shusheng Guo (4 out of 4 patents)

14. Qiang Yu (3 out of 17 patents)

15. Yongzeng Xue (3 out of 3 patents)

24 patents: Sort by Forward Citations

1. 12705278 - Logging image definition recognition method and device, medium, and electronic equipment (2026-08-11),

2. 12359519 - Coring and sampling integrated sub and downhole instrument (2025-07-15),

3. 12320942 - Sensor module, sensor assembly and acoustic logging tool (2025-06-03),

4. 12235194 - Coring device (2025-02-25),

5. 12188919 - Method and system for measuring composition and property of formation fluid (2025-01-07),

6. 12025159 - Hydraulic power system for downhole device and downhole device (2024-07-02),

7. 12012816 - Core detection device of coring instrument and spacer insertion device (2024-06-18),

8. 11927713 - Method, device and medium for acquiring logging parameters (2024-03-12),

9. 11905829 - Integrated logging instrument for coring and sampling (2024-02-20),

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

11. 11739603 - Core detection device of coring instrument (2023-08-29),

12. 11624244 - Connecting structure for drill collar of logging while drilling instrument and drill collar sub male and female joints (2023-04-11),

13. 11072981 - Sampling-by-pushing system and setting method thereof (2021-07-27),

14. 11028658 - Horizontal-to-vertical drilling module for deep well (2021-06-08),

15. 10381899 - Sidewall coring structure directly driven by an electric motor (2019-08-13),

Company Overview

China Oilfield Services Limited is a leading provider of integrated oilfield services, specializing in offshore and onshore exploration and production support. The company focuses on a range of services including drilling, well services, and geophysical exploration, leveraging advanced technologies to enhance operational efficiency. Headquartered in Tianjin, China, COSL plays a pivotal role in the energy sector, catering to both domestic and international markets while contributing to the development of sustainable energy solutions.

Profile summary synthesized from public USPTO records and patent filings.

Company Badge

USPTO Data Jan 1 1976 - Oct 20 2026

24 Patents

#14 in Tianjin

#1,247 in China

#26,686 in the World

China Oilfield Services, Limited

Forward Citations = 12

89 inventors:

Yongren Feng (18 out of 18 patents)

Lin Huang (10 out of 10 patents)

Tiemin Liu (9 out of 9 patents)

4. Xiaodong Chu (9 out of 9 patents)

5. Zhibin Tian (9 out of 9 patents)

IDiyas Innovation Intelligence. (2026). Company Patent Portfolio: China Oilfield Services, Limited. Retrieved from https://idiyas.com/company/china-oilfield-services

Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile

Data Sources: USPTO Patent Grant XML, Patent Center, EPO & CIPO • Normalized by IDiyas Innovation Graph. Methodology & provenance architecturePlease report any incorrect information to [email protected]

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