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ROBERT MITCHELL CO LTD

Overview
  • Total Patents
    41
About

ROBERT MITCHELL CO LTD has a total of 41 patent applications. Its first patent ever was published in 1937. It filed its patents most often in Canada, United States and United Kingdom. Its main competitors in its focus markets civil engineering, transport and machines are NAHR H, TEH YOR CO and EMERY PLATO G.

Patent filings in countries

World map showing ROBERT MITCHELL CO LTDs patent filings in countries
# Country Total Patents
#1 Canada 25
#2 United States 15
#3 United Kingdom 1

Patent filings per year

Chart showing ROBERT MITCHELL CO LTDs patent filings per year from 1900 to 2020

Top inventors

# Name Total Patents
#1 Woelfel Harold M 12
#2 Sontheim Herman W 5
#3 Lipsett Solomon G 3
#4 Ehret Yale W 2
#5 Macdonald James 2
#6 Clerk Edouard 2
#7 White John 2
#8 John White 1
#9 Bunker Harry A 1
#10 Lucien Guilbault 1

Latest patents

Publication Filing date Title
US3072445A Combination journal stop and seal for railway cars
GB834511A Weather-sealed window structure
US2867250A Disc cutting attachment for band saws
US2856041A Weather-sealed window structure
US2747745A Parcel racks for vehicles
US2753920A Convertible wheel type chair-bed
US2825636A Fuel ignition method for coal burning railway car heaters
US2495201A Washbasin and toilet bowl assembly
US2387119A Insulating window
US2327974A Preformed multipane glazing unit
US2314850A Air vent
US2275812A Preformed multipane glazing unit
US2266387A Window construction
US2233952A Window frame construction
US2275811A Apparatus for forming multipane glazing units
US2207745A Window frame construction
CA433834A Window insulation
CA403097A Multi-pane glazing unit
CA373383A Charcoal burner
CA395275A Multi-pane glazing unit manufacturing apparatus