Tesla sells patents for A.C. Polyphase System to George Westinghouse for $25,000 in cash, $50,000 in notes and a royalty of $2.50 per horsepower for each motor.
https://teslauniverse.com/nikola-tesla/timeline/1888-tesla-s...
Some tangential history regarding Westinghouse for fun.
Tesla sells patents for A.C. Polyphase System to George Westinghouse for $25,000 in cash, $50,000 in notes and a royalty of $2.50 per horsepower for each motor.
https://teslauniverse.com/nikola-tesla/timeline/1888-tesla-s...
Some tangential history regarding Westinghouse for fun.