At the beginning of 1893, Westinghouse engineer Benjamin Lamme had made great progress developing an efficient version of Tesla's induction motor, and Westinghouse Electric started branding their complete polyphase phase AC system as the "Tesla Polyphase System".
They believed that Tesla's patents gave them patent priority over other AC systems.
In 1893 George Westinghouse won the bid to light the 1893 World's Columbian Exposition in Chicago with alternating current, beating out a General Electric bid by one million dollars.
This World's Fair devoted a building to electrical exhibits. It was a key event in the history of AC power, as Westinghouse demonstrated to the American public the safety, reliability, and efficiency of a fully integrated alternating current system.
Tesla demonstrated a series of electrical effects at the Columbian Exposition under a banner announcing the "Tesla Polyphase System", which had previously been performed throughout America and Europe; these included using high-voltage, high-frequency alternating current to light a wireless gas-discharge lamp.