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CAMPBELL JULIAN A

Overview
  • Total Patents
    35
About

CAMPBELL JULIAN A has a total of 35 patent applications. Its first patent ever was published in 1925. It filed its patents most often in United States and Canada. Its main competitors in its focus markets chemical engineering, machines and thermal processes are MADISON FILTER LTD, FACET QUANTEK INC and WILLIAMS ELMER R.

Patent filings in countries

World map showing CAMPBELL JULIAN As patent filings in countries
# Country Total Patents
#1 United States 34
#2 Canada 1

Patent filings per year

Chart showing CAMPBELL JULIAN As patent filings per year from 1900 to 2020

Top inventors

# Name Total Patents
#1 Campbell Julian A 35
#2 Carter Samuel C 2

Latest patents

Publication Filing date Title
US2931163A Meter clock winding device
US2755886A Fluid separators
US2763534A Corrosion detector
US2694171A Electric motor system for liquid level control
US2590681A Gas separator
US2590680A Apparatus for liquid level controls
US2620819A Liquid level control system
US2520305A Curb indicator switch for vehicles
US2448251A Liquid level control
US2422527A Gas separator
US2376029A Boiler feed water regulation
US2355270A Boiler feed water control
US2313920A Gauge strip
US2339457A Pulsation dampener
US2284130A Boiler feed control
US2245648A Valve seal
US2207214A Boiler feed water control
US2183347A Packing material
US2091671A Valve
US2061830A Liquid and gas contacting apparatus