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DUFOUR LEON

Overview
  • Total Patents
    112
About

DUFOUR LEON has a total of 112 patent applications. Its first patent ever was published in 1904. It filed its patents most often in Switzerland, Austria and Canada. Its main competitors in its focus markets transport, agriculture and engines, pumps and turbines are LEON DUFOUR, ALBAN DE VIREL and HOWARD ARTHUR CLIFFORD.

Patent filings in countries

World map showing DUFOUR LEONs patent filings in countries
# Country Total Patents
#1 Switzerland 58
#2 Austria 13
#3 Canada 10
#4 United Kingdom 8
#5 Germany 7
#6 Denmark 5
#7 Spain 5
#8 United States 5
#9 Belgium 1

Patent filings per year

Chart showing DUFOUR LEONs patent filings per year from 1900 to 2020

Top inventors

# Name Total Patents
#1 Dufour Leon 72
#2 Leon Dufour 34

Latest patents

Publication Filing date Title
ES170868A1 An agricultural or road tractor
ES168750A1 A device for the address of a vehicle
ES111341A1 Rotary plow of automatic march.
CA179406A Distributing gear for valveless combustion engines
US1241833A Internal-combustion engine.
GB106474A Improvements in or relating to Internal Combustion Engines.
GB104666A Improvements in or relating to the Lubrication of Internal Combustion Engines.
GB100285A Speed Indicator.
US1231341A Friction-coupling.
GB100267A Improvements in Friction-clutches.
GB191325398A Improvements in or relating to Valve Gear for Internal Combustion Engines.
US1132247A Valve-gear of explosion-engines.
US1131344A Regulating device for hydraulic turbines.
US1099640A Shock-absorber.
GB191208335A Improvements in Suspension Devices for Motor and other Vehicles.
GB190927019A Improvements in Hydraulic Turbine Regulating Devices.
GB190406745A Improvements in relating to Fluid Pressure Turbines
CA324669A Rotary tiller
CA445311A Traction method and machine
CA441428A Steering device for vehicles