1940s
1940
- UL certifies first automatic vending machine.
1941
- UL tests fireproof flues and vents for temporary war-time housing.
- UL tests combustibility of new plastics.
1942
- UL is classified as an “essential” industry in WWII.
- UL tests devices to protect against sabotage of U.S. plants producing or storing important material to the war program.
- UL revises safety standards to allow “temporary” changes to requirements to address shortage of critical materials needed for WWII.
1943
- UL supports WWII effort by developing systems for protecting windows from bomb explosions.
- UL staff developed system to simplify installation of copper conductors used in lightning protection saving the Pentagon thousands of tons of copper.
1944
- UL celebrates 50 years of service of testing for public safety.
- Nearly 1000 military personnel reported to UL for Army-Navy sponsored training classes in fire protection and general safety.
1945
- Removal of wartime controls in most industries results in product submittals of new models of radios, small wire connectors designed during the war for use in airplanes.
- UL certifies first synthetic insulation in fabrication of wires.
- UL certifies first electric blanket.
1946
- UL certifies the first post-war televisions.
- UL certifies first completely electronic motor controller, first gasoline burning space heater for use in trucks, and first thermoplastic Christmas tree lighting outfit.
1947
1948
- Curtis Welborn becomes UL’s fourth president, initiating major expansion programs that lead to the construction of new testing facilities in Northbrook, IL and Santa Clara, CA.
1949
- UL’s Lemont, IL testing station purchased by the U.S. Atomic Energy Commission for use as a part of Argonne National Laboratory.
- UL certifies first motor operated television antenna, and first heating cable for piping system.
- UL certifies first commercial cooking appliance identified as Ultra High Frequency Cooking Unit (microwave type).
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