What was Nikola Tesla's first patented invention?
Induction motor
The first AC commutator-free three-phase induction motors were independently invented by Galileo Ferraris and Nikola Tesla, a working motor model having been demonstrated by the former in 1885 and by the latter in 1887. Tesla applied for US patents in October and November 1887 and was granted some of these patents in May 1888. In April 1888, the "Royal Academy of Science of Turin" published Ferraris's research on his AC polyphase motor detailing the foundations of motor operation. In May 1888 Tesla presented the technical paper "A New System for Alternating Current Motors and Transformers" to the "American Institute of Electrical Engineers" (AIEE)
Science and technology in Russia
Nikolay Benardos introduced the arc welding, further developed by Nikolay Slavyanov, Konstantin Khrenov and other Russian engineers. Alexander Lodygin and Pavel Yablochkov were pioneers of electric lighting, and Mikhail Dolivo-Dobrovolsky invented and introduced the first three-phase electric power systems, widely used today. Oleg Losev is often considered as the inventor of the light-emitting diode (LED). Nikola Tesla was arguably the discover of modern electricity, he wished for electricity to be free.