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DOMAN HELICOPTERS INC

Overview
  • Total Patents
    33
About

DOMAN HELICOPTERS INC has a total of 33 patent applications. Its first patent ever was published in 1946. It filed its patents most often in United States, United Kingdom and Canada. Its main competitors in its focus markets transport, measurement and mechanical elements are DOMAN HELICOPTERS, HILLER AIRCRAFT COMPANY INC and GUSTAV SCHWARZ G M B H.

Patent filings in countries

World map showing DOMAN HELICOPTERS INCs patent filings in countries
# Country Total Patents
#1 United States 21
#2 United Kingdom 10
#3 Canada 2

Patent filings per year

Chart showing DOMAN HELICOPTERS INCs patent filings per year from 1900 to 2020

Top inventors

# Name Total Patents
#1 Doman Glidden S 14
#2 Du Pont Stephen 7
#3 Bewley Richard W 1
#4 Batesole William R 1
#5 Stack George R 1
#6 Zeerip Thomas E 1
#7 Hooper Clinton E 1
#8 Frengley Michael C 1
#9 North Jacob A 1

Latest patents

Publication Filing date Title
US3080002A Rotor with fixed pylon
US3087690A Rotor with two joints in drive shaft
US3007530A Helicopter rotor head
US2966947A Folding helicopter blade
US3082826A Rotor head with collective pitch control
US2978038A Swash plate operating mechanism and combination with swash plate
GB840277A Improvements in or relating to a helicopter rotor head combination with mechanism tofly rotor level
US3055437A Moisture proof helicopter blade
US2861640A Helicopter rotor head combination with mechanism to fly rotor level
US3007654A Rotor and blade for rotorcraft
US2928478A Freely tilting rotor for self sustaining aircraft with erecting mechanism and the erecting mechanism
GB754408A Device for measuring the aerodynamic pitching moments of a short length of a full sized airfoil
GB754171A Tilt stop for freely tilting rotor of rotorcraft
GB756784A Fluid and mechanical coupling with centrifugal and frictional clutches
US2770967A Device for measuring the aerodynamic pitching moments of a short length of a full sized airfoil
US2859844A Fluid and mechanical coupling with centrifugal and frictional clutches
GB724999A Aircraft frame with large side openings
US2716889A Method of determining and adjusting the aerodynamic pitching moment of a full-sized aerodynamic member and apparatus therefor
GB718556A Mechanical directional and trim control for rotary wing aircraft
US2715325A Constant velocity universal joint