PITTSBURGH TRANSFORMER CO innovation strategy

Patent filings in countries

#	Industry
#1	Electrical machinery and energy
#2	Machines
#3	Machine tools
#4	Thermal processes
#5	Measurement

#	Technology
#1	Magnets and transformers
#2	Unspecified technologies
#3	Soldering, welding and flame cutting
#4	Heat-exchanger without contact
#5	AC and DC conversion devices
#6	Electrically-conductive connections
#7	Punching metal
#8	Unspecified technologies
#9	Cables and insulators
#10	Measuring temperature

Publication	Filing date	Title
US1706574A	1927-03-15	Electric transformer
US1706609A	1926-04-05	Temperature indicator
US1634719A	1926-03-23	Heater for transformer oil
US1655837A	1925-12-17	Subway transformer
US1643014A	1925-12-07	Cooling system for electrical apparatus
US1641294A	1925-08-03	Tap changer
US1685223A	1924-12-20	Electrical apparatus
US1623467A	1924-06-07	Corrugating machine
US1735289A	1924-03-01	Radiator connection for transformer tanks
US1706412A	1924-02-29	Terminal for conductors
US1740093A	1924-02-01	Transformer
US1641272A	1923-12-20	Transformer winding
US1502204A	1923-09-26	Tank for transformers and the like
US1557283A	1923-05-04	Transformer structure
US1641271A	1923-02-12	Transformer-tap changer
US1641248A	1923-01-15	Transformer tank
US1544296A	1922-12-29	Casing for electrical apparatus
US1622030A	1922-12-07	Casing for electrical apparatus
US1498537A	1922-09-01	Filter
US1500818A	1922-09-01	Cooling radiator for transformers