Inventor
WAFER DON B
US9 patents
Patents
9 patentsUS5221063AJun 22, 1993
Selective double backseat for valve stems
FMC CORP21 citations92
US5732731AMar 31, 1998
Secondary seal bypass valve for gate valves
FMC CORP40 citations91
US5730218AMar 24, 1998
Tool protection guide with energy absorbing bumper
FMC CORP19 citations89
US6007111ADec 28, 1999
Dual metal seal for wellhead housing
FMC CORP7 citations72
US4711262ADec 8, 1987
Uni-directional/bi-directional gate valve
FMC CORP19 citations71
US5896925AApr 27, 1999
Tool protection guide
FMC CORP9 citations70
US5511286AApr 30, 1996
Handle with modular hub
FMC CORP14 citations69
US5404615AApr 11, 1995
Handle
FMC CORP10 citations69
US4848777AJul 18, 1989
Pressure energized/pressure intensified casing seal
FMC CORP18 citations65