Learn more

HARTZELL PROPELLER INC

Overview
  • Total Patents
    23
About

HARTZELL PROPELLER INC has a total of 23 patent applications. Its first patent ever was published in 1957. It filed its patents most often in United States and United Kingdom. Its main competitors in its focus markets transport, machines and electrical machinery and energy are HAWKER SIDDELEY AVIAT, KAREM ABE and LI YONGLIN.

Patent filings in countries

World map showing HARTZELL PROPELLER INCs patent filings in countries
# Country Total Patents
#1 United States 21
#2 United Kingdom 2

Patent filings per year

Chart showing HARTZELL PROPELLER INCs patent filings per year from 1900 to 2020

Top inventors

# Name Total Patents
#1 David Biermann 10
#2 Harlamert W Benjamin 3
#3 Stackhouse Donald C 3
#4 Biermann David 2
#5 Jones Earl W 2
#6 Zimpfer Dennis S 2
#7 Pace Loy D 2
#8 Grimes Richard V 2
#9 Thompson David F 1
#10 Ziegler David E 1

Latest patents

Publication Filing date Title
US5061153A Aircraft propeller assembly with blade pitch reset for ground idle
US5020741A Aircraft propeller with improved electrically de-icer leads
US4904157A Aircraft propeller assembly with blade pitch reset for ground idle
US4810167A Composite aircraft propeller blade
US4699568A Aircraft propeller with improved spinner assembly
US4302155A Air craft propeller assembly with composite blades
US4097189A Aircraft propeller and blade pitch control system
US3861828A Aircraft propeller and vibration damper assembly
US3575529A Method and apparatus for operating a propeller and driving engine fuel valve
US3461966A Unitary fixed pitch aircraft propeller
US3380535A Constant speed and reversible aircraft propeller
US3249159A Propeller control system
US3156301A Variable pitch propeller
US3115937A Feathering propeller
GB919883A Armored screw propeller blade and method of making same
US2986222A Adjustable pitch propeller
US3027949A Adjustable pitch propeller having integral control system
US2997111A Propeller utilizing fractured bearing
US2989126A Governor and method of synchronizing engines
US3057410A Controllable pitch propeller