Inventor
KEITHAHN JULIAN D
4 patents
Patents
4 patentsUS4444250AApr 24, 1984
Flow diverter
HYDRIL CO188 citations98
US4635678AJan 13, 1987
Flow control apparatus
HYDRIL CO63 citations94
US4605195AAug 12, 1986
Annular blowout preventer packing unit
HYDRIL CO20 citations81
US4342330AAug 3, 1982
Ball type valve having improved redundant sealing system
HYDRIL CO12 citations68