About Panasonic > Corporate Profile > History > Corporate History > Panasonic Product Timeline
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Corporate History
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The world's first zinc oxide varistor was developed
in 1968 by employing zinc oxide (ZnO) to make varistors (nonlinear
resistor devices) for practical use. The theory behind the development
was a pulse voltage suppression for practical use in TV receivers.
Licensing agreements were made with leading world manufacturers, including
General Electric and Westinghouse in the U.S. and Asea in Sweden.
In addition, its application of protecting against lightning surges
in semiconductor devices, made possible an advancement in the use
of more electronic and semiconductor devices in home electric appliances,
communications equipment, industrial machinery, and electrical machinery.
It was also applied to lightning surge arrester devices in a wide
range of fields, thus greatly contributing to improved reliability
in lightning surge arresters.
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About Panasonic > Corporate Profile > History > Corporate History > Panasonic Product Timeline