Assignee
BEIJING HAILAN SCIENCE & TECH DEVELOPMENT CO LTD
CN·3 granted patents·0 citations·filing 2015–2015
Top patents by PatentIndex Score
3 records- 0136US9915115B2Petroleum instrument salvaging connector and petroleum instrumentBEIJING HAILAN SCIENCE & TECH DEVELOPMENT CO LTD·Filed 2015·Granted Mar 13, 2018·0 cites·7 claims
- 0230US9938790B2Petroleum instrument hoisting system and hoisting headBEIJING HAILAN SCIENCE & TECH DEVELOPMENT CO LTD·Filed 2015·Granted Apr 10, 2018·0 cites·17 claims
- 0329US10087054B2Rope winder, petroleum instrument salvaging system and petroleum instrument hoisting systemBEIJING HAILAN SCIENCE & TECH DEVELOPMENT CO LTD·Filed 2015·Granted Oct 2, 2018·0 cites·7 claims
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