The first ozone generator

The first ozone generator "Corona ozone generator" was patented in June 1896 by Nikola Tesla

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http://www.institutotesla.org/patents/00568177.pdf

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Only four years later, Nikola Tesla founded the Tesla Ozone Company, which produced ozone generators for a variety of purposes - sterilization of the hospital rooms, instruments, drinking water sterilization, wound cleaning, therapeutic and medical uses, as well as ozone-based products.

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Carlson W. Bernard and Tesla: The Electrical Age Inventor. Princeton University Press. ISBN 978-1-4008-4655-9.

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https://press.princeton.edu/books/paperback/9780691165615/tesla