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KEEN JOHN S

Overview
  • Total Patents
    17
About

KEEN JOHN S has a total of 17 patent applications. Its first patent ever was published in 1927. It filed its patents most often in United States and Canada. Its main competitors in its focus markets transport, engines, pumps and turbines and machines are MCKEEN MOTOR CAR COMPANY, JOHN R WINTER SR and RAILWAY PRODUCTS CORP.

Patent filings in countries

World map showing KEEN JOHN Ss patent filings in countries
# Country Total Patents
#1 United States 16
#2 Canada 1

Patent filings per year

Chart showing KEEN JOHN Ss patent filings per year from 1900 to 2020

Top inventors

# Name Total Patents
#1 Keen John S 17
#2 Shannon Ellwood M 3
#3 Deans Frank B 2
#4 Allen Wallace 1
#5 Elliott Edward O 1
#6 Sinnott Thomas F 1

Latest patents

Publication Filing date Title
US2112534A Locomotive engine exhaust
US1989639A Drawbar
US1998241A Method of making valve mechanism
US2018790A Reversing mechanism for poppet valve gear cam boxes
US2058890A Power reverse valve control
US1874306A Six-wheel tender truck
US1831711A Trailer truck
US1864441A Trailer truck
US1799048A Locomotive cab
US1780082A Two-wheel locomotive truck
US1784729A Valve gear
US1759701A Valve gear
US1823610A Electric locomotive
US1827587A Main crank pin collar for locomotives
US1731138A Push pole for locomotives
US1720903A Locomotive
CA341763A Power reverse valve control