Inventor · disambiguated record
Edward G. Holtgraver
Also filed as: HOLTGRAVER EDWARD · HOLTGRAVER EDWARD G · HOLTGRAVER EDWARD GEORGE
17 granted patents·1 pending application·304 citations·filing 1977–2024
94Inventor score
Top patents by PatentIndex Score
18 records- 0187US8863596B2Flat yoke valve actuatorHOLTGRAVER EDWARD G·Filed 2011·Granted Oct 21, 2014·11 cites·6 claims
- 0284US5244183AFugitive emission sealing assemblyKEYSTONE INT·Filed 1991·Granted Sep 14, 1993·55 cites·39 claims
- 0383US8087316B2Flat yoke valve actuatorHOLTGRAVER EDWARD GEORGE·Filed 2007·Granted Jan 3, 2012·15 cites·9 claims
- 0482US10533583B2System for determining safety margin of an installed driven memberQTRCO INC·Filed 2018·Granted Jan 14, 2020·3 cites·7 claims
- 0581US5386761ARotary valve actuatorSAVINGS BY DESIGN INC·Filed 1993·Granted Feb 7, 1995·35 cites·20 claims
- 0681US4399833AValve assemblyKEYSTONE INT·Filed 1982·Granted Aug 23, 1983·35 cites·13 claims
- 0779US12460737B2Line break deviceQTRCO INC·Filed 2024·Granted Nov 4, 2025·0 cites·2 claims
- 0876US4570901APositioning assembly for use with rotatable valvesKEYSTONE INT·Filed 1984·Granted Feb 18, 1986·32 cites·14 claims
- 0973US10132337B2Actuator assembly for conducting partial stroke testingQTRCO INC·Filed 2016·Granted Nov 20, 2018·2 cites·17 claims
- 1071US4148458ATight shutoff butterfly valveFISHER CONTROLS CO·Filed 1977·Granted Apr 10, 1979·24 cites·2 claims
- 1170US4410163AValve seatKEYSTONE INT·Filed 1982·Granted Oct 18, 1983·25 cites·29 claims
- 1268US4711427AApparatus for connecting a valve element to a valve stemKEYSTONE INT·Filed 1986·Granted Dec 8, 1987·25 cites·7 claims
- 1363US5492050APneumatic actuator with rack and pinion assemblyFiled 1994·Granted Feb 20, 1996·23 cites·31 claims
- 1461US9464719B2Seal assembly for use in harsh environmentsHOLTGRAVER EDWARD·Filed 2012·Granted Oct 11, 2016·2 cites·17 claims
- 1560US12146589B2Actuator assembly for conducting partial stroke testingQTRCO INC·Filed 2022·Granted Nov 19, 2024·0 cites·7 claims
- 1658US11879564B2Rotary valve lockout apparatusQTRCO INC·Filed 2023·Granted Jan 23, 2024·0 cites·2 claims
- 1752US5538029AMethod for adjusting valve sealing engagementPRATT CO HENRY·Filed 1995·Granted Jul 23, 1996·17 cites·3 claims
- 1840US2015362078A1Double-Offset Butterfly ValveHOLTGRAVER EDWARD G·Filed 2013·Application pending·0 cites
Join the waitlist — get patent alerts
Get an alert when Edward G. Holtgraver 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 →