Inventor
FREER RICHARD
CA48 patents
⚠️ This page may combine multiple inventors who share the name “FREER RICHARD”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
PRATT & WHITNEY CANADA
44 patentsUS11827370B1Nov 28, 2023
Aircraft propulsion system with intermittent combustion engine and electric transmission system and method for operating the same
PRATT & WHITNEY CANADA11 citations86
US10998806B2May 4, 2021
Electric machine systems
PRATT & WHITNEY CANADA6 citations84
US11719166B1Aug 8, 2023
Aircraft propulsion system with intermittent combustion engine(s)
PRATT & WHITNEY CANADA2 citations73
US11233470B2Jan 25, 2022
Synchronization of generator and electric motor in a hybrid electric aircraft propulsion system
PRATT & WHITNEY CANADA2 citations73
US11190093B2Nov 30, 2021
Electric machine systems with gears
PRATT & WHITNEY CANADA4 citations73
US11011966B2May 18, 2021
Electric machine systems
PRATT & WHITNEY CANADA4 citations73
US10865761B2Dec 15, 2020
Igniter for gas turbine engine
PRATT & WHITNEY CANADA2 citations72
US12467513B2Nov 11, 2025
Method and apparatus for actively damping vibrations in a hybrid-electric aircraft propulsion system
PRATT & WHITNEY CANADA0 citations62
US12365469B2Jul 22, 2025
Aircraft propulsion system with intermittent combustion engine(s)
PRATT & WHITNEY CANADA0 citations62
US12240625B2Mar 4, 2025
DC bus voltage control
PRATT & WHITNEY CANADA0 citations62
US12163468B1Dec 10, 2024
Aircraft powerplant with electric transmission(s)
PRATT & WHITNEY CANADA0 citations62
US12139265B2Nov 12, 2024
Aircraft propulsion system with intermittent combustion engine and electric transmission system and method for operating the same
PRATT & WHITNEY CANADA1 citations62
US11990806B2May 21, 2024
Electric machine systems
PRATT & WHITNEY CANADA0 citations62
US11909283B2Feb 20, 2024
Electric machine systems having magnetised bi-pole rotors
PRATT & WHITNEY CANADA0 citations62
US11894742B2Feb 6, 2024
Electric machine systems comprising a stator common to the plurality of rotors
PRATT & WHITNEY CANADA0 citations62
US11863032B2Jan 2, 2024
Multi-rotor electric machine systems
PRATT & WHITNEY CANADA0 citations62
US11757386B2Sep 12, 2023
Hybrid electric propulsion system and method of operation
PRATT & WHITNEY CANADA0 citations62
US11649065B2May 16, 2023
DC bus voltage control
PRATT & WHITNEY CANADA0 citations62
US11408351B2Aug 9, 2022
Igniter for gas turbine engine
PRATT & WHITNEY CANADA1 citations62
US11283376B2Mar 22, 2022
Hybrid electric propulsion system and method of operation
PRATT & WHITNEY CANADA0 citations62
US11025181B2Jun 1, 2021
Hybrid electric propulsion system and method of operation
PRATT & WHITNEY CANADA0 citations62
US11692489B2Jul 4, 2023
Igniter for gas turbine engine
PRATT & WHITNEY CANADA0 citations61
US11614034B2Mar 28, 2023
Igniter for gas turbine engine
PRATT & WHITNEY CANADA0 citations61
US11415060B2Aug 16, 2022
Igniter for gas turbine engine
PRATT & WHITNEY CANADA0 citations61
US11268447B2Mar 8, 2022
Igniter for gas turbine engine
PRATT & WHITNEY CANADA1 citations61
US11739693B2Aug 29, 2023
Method and system for glow plug operation
PRATT & WHITNEY CANADA0 citations54
US12559245B2Feb 24, 2026
Systems and methods for controlling an electrical distribution system for a hybrid-electric aircraft propulsion system
PRATT & WHITNEY CANADA0 citations52
US12466288B2Nov 11, 2025
Nested control loop structure for hybrid propulsion system
PRATT & WHITNEY CANADA0 citations52
US12296941B2May 13, 2025
System and method for controlling a propulsor for a hybrid-electric aircraft propulsion system
PRATT & WHITNEY CANADA0 citations52
US12270332B1Apr 8, 2025
Hybrid-electric aircraft propulsion system control system and method
PRATT & WHITNEY CANADA0 citations52
US12263953B2Apr 1, 2025
System and method for operating a hybrid aircraft power plant
PRATT & WHITNEY CANADA0 citations52
US12031473B2Jul 9, 2024
Aircraft propulsion system with intermittent combustion engine, hydraulic motor, and cooling system
PRATT & WHITNEY CANADA0 citations52
US12031513B2Jul 9, 2024
Method and system for glow plug operation
PRATT & WHITNEY CANADA0 citations52
US10826415B2Nov 3, 2020
Operation of a hybrid electric aircraft propulsion system
PRATT & WHITNEY CANADA0 citations52
US11454173B2Sep 27, 2022
Igniter for gas turbine engine
PRATT & WHITNEY CANADA0 citations51
US11401867B2Aug 2, 2022
Igniter for gas turbine engine
PRATT & WHITNEY CANADA0 citations51
US11391212B2Jul 19, 2022
Igniter for gas turbine engine
PRATT & WHITNEY CANADA0 citations51
US11391213B2Jul 19, 2022
Igniter for gas turbine engine
PRATT & WHITNEY CANADA0 citations51
US11286861B2Mar 29, 2022
Igniter for gas turbine engine
PRATT & WHITNEY CANADA0 citations51
US11268486B2Mar 8, 2022
Igniter for gas turbine engine
PRATT & WHITNEY CANADA0 citations51
US11255271B2Feb 22, 2022
Igniter for gas turbine engine
PRATT & WHITNEY CANADA0 citations51
US12576977B2Mar 17, 2026
Aircraft propulsion system with engine ratings as a function of system components
PRATT & WHITNEY CANADA0 citations49
US12391392B1Aug 19, 2025
Master-slave hybrid-electric powertrain control architecture with supervisory power management control
PRATT & WHITNEY CANADA0 citations48
US12447826B2Oct 21, 2025
System and method for controlling an aircraft electrical distribution system
PRATT & WHITNEY CANADA0 citations47