Inventor · disambiguated record
Walter W. Powell
Also filed as: POWELL WALTER · POWELL WALTER W
19 granted patents·564 citations·filing 1981–2000
96Inventor score
Top patents by PatentIndex Score
19 records- 0196US4428815AVacuum-type article holder and methods of supportively retaining articlesWESTERN ELECTRIC CO·Filed 1983·Granted Jan 31, 1984·130 cites·18 claims
- 0287US4705065ASafety relief system for control or vent valvesANDERSON GREENWOOD & CO·Filed 1986·Granted Nov 10, 1987·50 cites·26 claims
- 0384US5842501APilot operated safety relief valveFLOW SAFE INC·Filed 1997·Granted Dec 1, 1998·57 cites·11 claims
- 0479US5555910APressure relief valves adapted for low pressure operationGROTH CORP·Filed 1994·Granted Sep 17, 1996·49 cites·16 claims
- 0573US5341838ADirect spring pressure operated valvePOWELL WALTER W·Filed 1993·Granted Aug 30, 1994·35 cites·17 claims
- 0668US5499648ASealing means for pressure relief valves and methods of assemblyGROTH CORP·Filed 1994·Granted Mar 19, 1996·30 cites·13 claims
- 0768US4870989AHigh temperature safety relief systemKEYSTONE INT·Filed 1988·Granted Oct 3, 1989·26 cites·13 claims
- 0867US4388940APressure relief deviceANDERSON GREENWOOD & CO·Filed 1981·Granted Jun 21, 1983·21 cites·12 claims
- 0963US4848397AHigh temperature safety relief systemKEYSTONE INT·Filed 1988·Granted Jul 18, 1989·22 cites·13 claims
- 1063US4445531APilot for safety valveANDERSON GREENWOOD & CO·Filed 1981·Granted May 1, 1984·22 cites·13 claims
- 1161US4425938ALow pressure safety relief valvePAPA DONALD M·Filed 1982·Granted Jan 17, 1984·27 cites·14 claims
- 1258US4672995ARedundant pilot valve control systemANDERSON GREENWOOD & CO·Filed 1985·Granted Jun 16, 1987·17 cites·19 claims
- 1352US6386227B1Non-flowing pilot valveFLOW SAFE INC·Filed 2000·Granted May 14, 2002·5 cites·14 claims
- 1451US5890508AMain relief valve for safety relief systemFLOW SAFE INC·Filed 1996·Granted Apr 6, 1999·16 cites·8 claims
- 1550US5238021ADiaphragm operated spring loaded regulatorGROTH CORP·Filed 1993·Granted Aug 24, 1993·15 cites·13 claims
- 1649US4865074AHigh temperature safety relief systemKEYSTONE INT·Filed 1988·Granted Sep 12, 1989·15 cites·5 claims
- 1746US5163471ALow-pressure pilot valvePOWELL WALTER W·Filed 1992·Granted Nov 17, 1992·13 cites·6 claims
- 1838US5329968AShuttle valveKWW VERFAHRENSTECHNIK·Filed 1992·Granted Jul 19, 1994·9 cites·27 claims
- 1931US4964435AShuttle valveDISCO·Filed 1989·Granted Oct 23, 1990·5 cites·19 claims
Join the waitlist — get patent alerts
Get an alert when Walter W. Powell files or is granted a new patent.
We store only your email — no account needed. See our privacy policy.
Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →