| Summary: | In this paper are presented the results of an investigation directed to discovering and identifying Nikola Tesla’s patent applications filed with the United States Patent Office, but for which appropriate patents were not granted to him. The investigation showed that Tesla had at least 33 American patent applications for which patents were not granted, that shed a new light on his inventive activities in the United States of America. The subject matter of these patent applications are different Tesla’s inventions in the fields of electrical engineering, mechanical engineering and processing technology, more precisely metallurgy.
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