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Title of patent family (most common patent title) |
Family members |
Filing year |
---|---|---|
rotary lock block type drilling riser connector | 7 | 2011 |
drill pump cylinder sleeve inside and outside superficial cooling device | 3 | 2007 |
combined annular blowout preventer | 2 | 2009 |
blowout preventing box of continuous oil pipe and drill rod | 2 | 2011 |
method for adjusting windage of double-row self-aligning roller bearing in dissection-ty… 🛈 | 2 | 2011 |
underwater oil pipe hanger embedded guiding and positioning device | 2 | 2011 |
integrated oil casing head | 2 | 2011 |
combined flow-increasing connector for marine drilling riser | 2 | 2009 |
spindle type metal sealing and metal framework type rubber sealing sleeve hanger | 2 | 2011 |
method for processing winch frame in winch of petroleum drilling machine | 2 | 2010 |