Assignee
CHIFENG HAO FENG DRILLING CO LTD
CN·2 granted patents·0 citations·filing 2016–2023
Technology mixE21B2
Top patents by PatentIndex Score
2 records- 0133US12359513B2Hydraulic collapsible rotary stand for wireline coring underground drill rigCHIFENG HAO FENG DRILLING CO LTD·Filed 2023·Granted Jul 15, 2025·0 cites·20 claims
- 0219US10364628B2Use of pre-stressed steel strand in the procedure of multi-angle drilling coringCHIFENG HAO FENG DRILLING CO LTD·Filed 2016·Granted Jul 30, 2019·0 cites·1 claims
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