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JOHNS ROBERT W

Overview
  • Total Patents
    12
About

JOHNS ROBERT W has a total of 12 patent applications. Its first patent ever was published in 1974. It filed its patents most often in Germany, Canada and United States. Its main competitors in its focus markets civil engineering are HOPKINS DAVID J, HAN XINPING and TAMROCK VOEST ALPINE BERGTECH.

Patent filings in countries

World map showing JOHNS ROBERT Ws patent filings in countries
# Country Total Patents
#1 Germany 5
#2 Canada 4
#3 United States 3

Patent filings per year

Chart showing JOHNS ROBERT Ws patent filings per year from 1900 to 2020

Focus industries

# Industry
#1 Civil engineering

Focus technologies

# Technology
#1 Mining
#2 Shafts

Top inventors

# Name Total Patents
#1 Johns Robert W 12

Latest patents

Publication Filing date Title
US4076311A Hydraulic mining from tunnel by reciprocated pipes
CA1019356A Hook plow apparatus for longwall mining
CA1030566A Mining machine propulsion motor
DE2542115A1 Excavating appts for mining tar sands etc - includes rotary cutter on vertically movable swinging arm
US4021075A Excavators
CA989881A Method of mining oil shales, tar sands and other minerals
US3888543A Method for mining oil shales, tar sands, and other minerals