Assignee
HYDRIL
8 patents
Top patents by PatentIndex Score
US4192533AMar 11, 1980
Dovetail connection for pin and box joints
HYDRIL86 citations96
US4161332AJul 17, 1979
Dovetail connection for pin and box joints
HYDRIL75 citations96
US4195668AApr 1, 1980
High capacity pulsation dampener or surge absorber
HYDRIL33 citations91
US4240503ADec 23, 1980
Blowout preventer shearing and sealing rams
HYDRIL60 citations85
US4186776AFeb 5, 1980
Pulsation dampener or surge absorber
HYDRIL23 citations81
US4249599AFeb 10, 1981
Well safety system
HYDRIL25 citations74
US4184265AJan 22, 1980
Thread gage
HYDRIL9 citations71
US4205707AJun 3, 1980
Pipe protector
HYDRIL23 citations69