HOFFMAN SPECIALTY COMPANY innovation strategy

Patent filings in countries

#	Technology
#1	Domestic heating systems
#2	Unspecified technologies
#3	Venting or aerating devices
#4	Steam traps
#5	Systems controlling non-electric variables
#6	Air-conditioning
#7	Controlling combustion
#8	Pipes
#9	Preheating for stem generation
#10	Measuring force, work and fluid pressure

Publication	Filing date	Title
US2320104A	1939-11-17	Adapter for vent valves
US2289218A	1939-10-02	Siphonless vent valve
US2275397A	1939-09-14	Adjusting means for air valves
US2253588A	1938-09-14	Vent valve for steam heating systems
GB499692A	1938-03-11	Improvements in heating systems
US2181480A	1937-03-11	Heating system
US2129145A	1936-05-06	Self cleaning spray nozzle
US2190197A	1936-03-18	Adjustably vented air valve
US2197250A	1936-03-18	Adjusting means for air valves
US2175945A	1936-03-18	Heat control with one pipe steam heating system
US2107551A	1935-12-16	Steam trap and balanced valve
US2052992A	1934-12-17	Flow restrictor for heating systems
US2029950A	1933-02-03	Thermostatic relief valve
US2043074A	1932-07-28	Steam trap
US2043073A	1932-07-23	Boiler return trap
US2013113A	1932-07-22	Heating system
US1996309A	1932-01-26	Packless valve
US1916695A	1930-10-09	Vacuum check air valve for vapor heating systems
US1916696A	1930-10-09	Vacuum air valve for vapor heating systems
US1828080A	1928-09-25	Thermostatic steam trap