Inventor · disambiguated record
Defa Zeng
Also filed as: ZENG DEFA
2 granted patents·2 pending applications·0 citations·filing 2012–2024
22Inventor score
Technology areasE21B
Files withSICHUAN DEEPFAST OIL DRILLING TOOLS CO LTD2SICHUAN DEEP & FAST OIL DRILLING TOOLS CO LTD1ZHANG LIANG1
Top patents by PatentIndex Score
4 records- 0161US2024344398A1Percussion and Cutting Composite Drilling ToolSICHUAN DEEPFAST OIL DRILLING TOOLS CO LTD·Filed 2024·Application pending·0 cites
- 0252US2023193694A1Percussion and Cutting Composite Drilling ToolSICHUAN DEEPFAST OIL DRILLING TOOLS CO LTD·Filed 2022·Application pending·0 cites
- 0338US9828806B2Roller bit for rock breaking by rotary cuttingZHANG LIANG·Filed 2012·Granted Nov 28, 2017·0 cites·2 claims
- 0431US9562398B2Modular cutting-teeth drill bit with controllable drilling specific pressureSICHUAN DEEP & FAST OIL DRILLING TOOLS CO LTD·Filed 2013·Granted Feb 7, 2017·0 cites·1 claims
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →