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YOUNGSTOWN STEEL DOOR CO

Overview
  • Total Patents
    662
About

YOUNGSTOWN STEEL DOOR CO has a total of 662 patent applications. Its first patent ever was published in 1923. It filed its patents most often in United States, Canada and South Africa. Its main competitors in its focus markets transport, machines and civil engineering are CLINTON C MURPHY, UNITCAST CORP and CAMEL CO.

Patent filings in countries

World map showing YOUNGSTOWN STEEL DOOR COs patent filings in countries
# Country Total Patents
#1 United States 353
#2 Canada 256
#3 South Africa 18
#4 Brazil 14
#5 Australia 13
#6 Belgium 4
#7 Mexico 2
#8 France 1
#9 United Kingdom 1

Patent filings per year

Chart showing YOUNGSTOWN STEEL DOOR COs patent filings per year from 1900 to 2020

Top inventors

# Name Total Patents
#1 Beauchamp Wilfred A 94
#2 Frank Ditchfield 68
#3 Ditchfield Frank 61
#4 Madland Thorvald 50
#5 Thorvald Madland 36
#6 Johansson Carl E 35
#7 Gabriel Madland 30
#8 Tobin Kenneth J 24
#9 Madland Gabriel 23
#10 Mcwilliams John P 20

Latest patents

Publication Filing date Title
US4751793A Freight car door construction
ZA8205915B Bolt-on gate for railroad hopper car
BR8200557A Amount for use in suspension of motor vehicle
US4429921A Sliding bearing and seal
US4390196A Sliding door starter and closer
US4411560A Pneumatic hopper discharge outlet
US4452147A Intermodal railway car
US4450773A Sliding gate for a railroad hopper car
US4353187A Door repair method and repair section therefor
US4377304A Door lock
US4319429A Auxiliary crank end
US4324188A Hopper discharge outlet and method
CA1088379A Rail house car door crank mount
US4344366A Railway car door driver
US4344365A Railway hopper car gate anti-friction seal
US4260046A Power wheel for folding doors
ZA7904400B Sliding door starter and closer
US4240357A Folding rail car doors
US4210231A Power wheel for folding doors
CA1100814A Depressed center car