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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 |
petroleum drilling machine tower-shaped derrick sleeving mounting method | 2 | 2015 |
chain gear-shifting hanging device for automatic catwalk | 2 | 2015 |
casting method of mud pump air dome shell for bearing pressure | 2 | 2015 |
underwater multi-channel hydraulic fast connecting device | 2 | 2015 |
anti-loosening method for valve deck of drilling pump | 2 | 2015 |
method for processing curved slots on conical curved surface of driving ring body | 2 | 2015 |
free forging method for blowout preventer body used for petroleum drilling and production | 2 | 2015 |
method for slotting and cutting inner wall of noncontinuous box | 2 | 2015 |