Jiafu Zhang

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Shaanxi, CN

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Patents Grantslast 30 patents

Information Patent Grant
Cable head for petroleum logging
- Patent number 8,607,856
- Issue date Dec 17, 2013
- Tong Oil Tools Co., Ltd.
- Guoan Zhang
- Y10 - TECHNICAL SUBJECTS COVERED BY FORMER USPC

Patents Applicationslast 30 patents

Information Patent Application
CABLE HEAD FOR PETROLEUM LOGGING
- Publication number 20110318088
- Publication date Dec 29, 2011
- TONG OIL TOOLS CO., LTD.
- Guoan Zhang
- E21 - EARTH DRILLING MINING