[The following note describes a series of litigation records and has no documents attached to it. For that reason, a "no Documents found" message will appear if the "List Documents" button at the bottom of the note is used. To see the records described here, use the "Which Series Notes?" button to enter the Series Notes or use the "Next Text" button to move to the first item in the series.]
This file contains records relating to the case of Zipernowsky v. Edison, which involved conflicting claims over alternating current systems.
Karl (or Charles) Zipernowsky (1853-1942) was a Hungarian electrical engineer. Along with Otto Blathy and Maximilian Deri, he invented the ZBD alternating current transformer to convert high-voltage electric current to lower-voltage current. Zipernowsky and his partners received several patents on their inventions. This interference involved an application filed by Edison on November 19, 1886, and an application filed by Zipernowsky on March 19, 1888. Courtesy of the National Archives.