WP

Walter W. Powell

AL Anderson, Greenwood Lp: 3 patents #1 of 16Top 7%
FL Flow-Safe: 3 patents #2 of 10Top 20%
GR Groth: 3 patents #2 of 5Top 40%
KI Keystone International: 3 patents #12 of 50Top 25%
DI Disco: 1 patents #384 of 708Top 55%
WC Western Electric Company: 1 patents #173 of 531Top 35%
📍 Houston, TX: #1,061 of 21,073 inventorsTop 6%
🗺 Texas: #7,287 of 125,132 inventorsTop 6%
Overall (All Time): #242,335 of 4,157,543Top 6%
19
Patents All Time

Issued Patents All Time

Showing 1–19 of 19 patents

Patent #TitleCo-InventorsDate
6386227 Non-flowing pilot valve 2002-05-14
5890508 Main relief valve for safety relief system 1999-04-06
5842501 Pilot operated safety relief valve Michael L. Cognevich 1998-12-01
5555910 Pressure relief valves adapted for low pressure operation Milton Anderson, Louis R. Castaneda, Aciel Martin 1996-09-17
5499648 Sealing means for pressure relief valves and methods of assembly Louis R. Castaneda 1996-03-19
5341838 Direct spring pressure operated valve 1994-08-30
5329968 Shuttle valve 1994-07-19
5238021 Diaphragm operated spring loaded regulator Louis R. Castaneda 1993-08-24
5163471 Low-pressure pilot valve 1992-11-17
4964435 Shuttle valve 1990-10-23
4870989 High temperature safety relief system Cleo M. Bickford, Larry A. Sample 1989-10-03
4865074 High temperature safety relief system Cleo M. Bickford, Larry A. Sample 1989-09-12
4848397 High temperature safety relief system Cleo M. Bickford, Larry A. Sample 1989-07-18
4705065 Safety relief system for control or vent valves Michael D. McNeely 1987-11-10
4672995 Redundant pilot valve control system 1987-06-16
4445531 Pilot for safety valve 1984-05-01
4428815 Vacuum-type article holder and methods of supportively retaining articles Gary A. Seifert 1984-01-31
4425938 Low pressure safety relief valve Donald M. Papa 1984-01-17
4388940 Pressure relief device 1983-06-21