Inventor
SHAFFER RANDALL
US13 patents
Patents
13 patentsUS11424061B2Aug 23, 2022
Solenoid assembly actuation using resonant frequency current controller circuit
HANCHETT ENTRY SYSTEMS INC8 citations83
US11993953B2May 28, 2024
Power controller for a door lock and method of conserving power
HANCHETT ENTRY SYSTEMS INC2 citations72
US10815695B2Oct 27, 2020
Power controller for a door lock and method of conserving power
HANCHETT ENTRY SYSTEMS INC4 citations72
US10573450B2Feb 25, 2020
Degauss circuit for use in an electronically actuated door lock
HANCHETT ENTRY SYSTEMS INC2 citations71
US9509163B2Nov 29, 2016
Power control circuit assembly for an electric door latch mechanism
HANCHETT ENTRY SYSTEMS INC4 citations71
US12529243B2Jan 20, 2026
Power controller for a door lock and method of conserving power
HANCHETT ENTRY SYSTEMS INC0 citations61
US12191076B2Jan 7, 2025
Solenoid assembly actuation using resonant frequency current controller circuit
HANCHETT ENTRY SYSTEMS INC0 citations60
US11915869B2Feb 27, 2024
Solenoid assembly actuation using resonant frequency current controller circuit
HANCHETT ENTRY SYSTEMS INC0 citations60
US11545289B2Jan 3, 2023
Solenoid assembly with included constant-current controller circuit
HANCHETT ENTRY SYSTEMS INC0 citations59
US11203890B2Dec 21, 2021
Reduced power consumption electromagnetic lock
HANCHETT ENTRY SYSTEMS INC1 citations59
US10964467B2Mar 30, 2021
Solenoid assembly with included constant-current controller circuit
HANCHETT ENTRY SYSTEMS INC0 citations59
US10378242B2Aug 13, 2019
Constant-current controller for an inductive load
HANCHETT ENTRY SYSTEMS INC1 citations59
US12567526B2Mar 3, 2026
Solenoid assembly with included constant-current controller circuit
HANCHETT ENTRY SYSTEMS INC0 citations50