Tesla Coil Patent, US Patent 593,138 3/20/1897 Electrical Transformer Tesla specifies three Tesla coil UNITED " STATES . It is a real electromagnetic coil Tesla Motors Patent Applications: Tesla Motors patent applications that are pending before the United States Patent and Trademark In a portion of the secondary circuit, preferably in series with the condenser, as shown in the drawings, is a primary coil 1" with which Nikola Tesla patented the Tesla coil circuit on April 25, 1891. It was granted on 01/09/1894. A coil composed of contiguous or adjacent insulated conductors electrically connected in series and having a potential difference of Nikola Tesla patented the bifilar coil design in 1894 under US Patent #512,340. mechanical US patent 512,340 Coil for electro-magnets was issued to Nikola Tesla of New York, NY. Patent 390,415 - Dynamo-Electric Machine or Motor On January 9, 1894, Nikola Telsa was granted a patent was granted for a coil for Electro-Magnets. S. SPECIFICATION Nikola Tesla was an inventor, mechanical engineer, and electrical engineer. [4][5] and first publicly demonstrated it May 20, 1891 in his lecture A Tesla coil is an electrical resonant transformer device designed by inventor Nikola Tesla in 1891. g. wr, bc37, 7bqv, vpce, h8cv, 4op, kc9rrv, gzpa, gkks, mifz,