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DUPLEX MFG COMPANY

Overview
  • Total Patents
    18
About

DUPLEX MFG COMPANY has a total of 18 patent applications. Its first patent ever was published in 1913. It filed its patents most often in United States, Canada and Austria. Its main competitors in its focus markets civil engineering, basic materials chemistry and engines, pumps and turbines are GRUNDFOS PUMPS CORP, SYKES LTD HENRY and HUDSON ENG CO.

Patent filings in countries

World map showing DUPLEX MFG COMPANYs patent filings in countries
# Country Total Patents
#1 United States 7
#2 Canada 4
#3 Austria 2
#4 Denmark 2
#5 France 2
#6 Germany 1

Patent filings per year

Chart showing DUPLEX MFG COMPANYs patent filings per year from 1900 to 2020

Top inventors

# Name Total Patents
#1 Andrew Homer L 6
#2 Andrew Vaughan L 3
#3 Meyer Julius A 1
#4 Andrew Vanghan L 1

Latest patents

Publication Filing date Title
US3380533A Hydrant for pitless well units
US3324950A Pitless well unit
US3065698A Annular liquid pressure tank with annular separator float
US3065697A Annular buried pressure tank and system
US3065792A Well construction and method of assembling the same
US3094073A Pump control pressure switch with automatic air supply system
FR480982A Machine for shaping strips, small pieces of wood and feeding them to the conveyor which also unloads the matches
FR480981A Machine for the manufacture of round or square matches
US1104373A Combined snare strainer and muffler.
CA692432A Annular buried pressure tank and system
CA712405A Pump control pressure switch with automatic air supply system
CA696450A Annular liquid pressure tank with annular separator float
CA694428A Well construction and method of assembling the same