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J P KARNS TUNNELING MACHINE CO

Overview
  • Total Patents
    20
About

J P KARNS TUNNELING MACHINE CO has a total of 20 patent applications. Its first patent ever was published in 1905. It filed its patents most often in United States, Austria and Switzerland. Its main competitors in its focus markets civil engineering and mechanical elements are CANADIAN DOWNHOLE DRILL SYSTEM, EXTREME MACHINING AUSTRALIA PT and TURBODRILL INTERNAT CORP.

Patent filings in countries

World map showing J P KARNS TUNNELING MACHINE COs patent filings in countries
# Country Total Patents
#1 United States 12
#2 Austria 3
#3 Switzerland 3
#4 Denmark 2

Patent filings per year

Chart showing J P KARNS TUNNELING MACHINE COs patent filings per year from 1900 to 2020

Focus industries

# Industry
#1 Civil engineering
#2 Mechanical elements

Focus technologies

# Technology
#1 Earth drilling
#2 Shafts
#3 Shafts

Top inventors

# Name Total Patents
#1 Karns John Prue 9
#2 Karns John P 3
#3 Company The J P Karns Tunnelin 2
#4 Co The J P Karns Tunneling Mac 1

Latest patents

Publication Filing date Title
US1156147A Rock-reamer for drill-heads.
US957687A Tunneling-machine structure.
US977955A Cutter-head for tunneling-machines.
US1023654A Drilling-machine.
US906496A Antifriction-bearing.
US883137A Drill-head and cutter-blade therefor.
US879822A Sink-shaft drill.
US874848A Sink-shaft drill.
US867511A Shaft-bearing.
US892849A Drilling-machine.
US875664A Tunneling-machine.
US848107A Tunneling-machine.