Inventor
POWELL WALTER W
US19 patents
⚠️ This page may combine multiple inventors who share the name “POWELL WALTER W”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
ANDERSON GREENWOOD & CO
5 patentsUS4705065ANov 10, 1987
Safety relief system for control or vent valves
ANDERSON GREENWOOD & CO50 citations92
US4821772AApr 18, 1989
Dual active selector valve
ANDERSON GREENWOOD & CO35 citations90
US4445531AMay 1, 1984
Pilot for safety valve
ANDERSON GREENWOOD & CO22 citations81
US4388940AJun 21, 1983
Pressure relief device
ANDERSON GREENWOOD & CO21 citations81
US4672995AJun 16, 1987
Redundant pilot valve control system
ANDERSON GREENWOOD & CO17 citations73
FLOW SAFE INC
3 patentsGROTH CORP
3 patentsUS5499648AMar 19, 1996
Sealing means for pressure relief valves and methods of assembly
GROTH CORP30 citations90
US5555910ASep 17, 1996
Pressure relief valves adapted for low pressure operation
GROTH CORP49 citations86
US5238021AAug 24, 1993
Diaphragm operated spring loaded regulator
GROTH CORP15 citations71