Inventor
MIYAGISHIMA TOSH
6 patents
Patents
6 patentsUS4323256AApr 6, 1982
Front packer seal for ram blowout preventer
HYDRIL CO55 citations89
US4305595ADec 15, 1981
Composite seal
HYDRIL CO36 citations88
US4294314AOct 13, 1981
Inside blowout preventer well tool
HYDRIL CO35 citations87
US4248264AFeb 3, 1981
Internal mud saver valve
HYDRIL CO24 citations75
US4064601ADec 27, 1977
Well line strap connection
HYDRIL CO19 citations71
US4036296AJul 19, 1977
Subsurface well apparatus
HYDRIL CO6 citations61