OSCAR F CARLSON COMPANY innovation strategy

Patent filings in countries

#	Country	Total Patents
#1	United States	23

#	Industry
#1	Thermal processes
#2	Machines
#3	Mechanical elements
#4	Control
#5	Electrical machinery and energy
#6	Measurement

#	Technology
#1	Unspecified technologies
#2	Venting or aerating devices
#3	Preheating for stem generation
#4	Systems controlling non-electric variables
#5	Steam generation
#6	Electric switches
#7	Measuring volume
#8	Domestic heating systems
#9	Feeding fuel to combustion device
#10	Air-conditioning

Publication	Filing date	Title
US2753120A	1951-09-21	Control for hot water heating system
US2252962A	1940-11-30	Self-cleaning boiler control
US2253930A	1940-07-11	Pressure and temperature relief valve
US2237174A	1940-07-08	Float valve
US2226843A	1939-11-20	Valve construction
US2221942A	1939-09-09	Pressure reducing feed valve
US2261016A	1939-04-14	Switch
US2248807A	1939-01-03	Pressure relief valve
US2232996A	1938-09-06	Low water cutoff
US2194276A	1938-03-07	Valve
US2220144A	1937-09-11	Fluid responsive device
US2142435A	1936-05-01	Fluid responsive device
US2076547A	1936-04-06	Low water and pressure cut-off switch
US2078441A	1935-11-16	Limit switch
US2076546A	1935-10-04	Control switch
US2136220A	1935-08-16	Control switch
US2051938A	1935-06-29	Valve assembly
US2061270A	1934-05-09	Control means
US2009649A	1934-03-08	Level control valve
US2009648A	1933-02-23	Float