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any patent applications had been prepared, that Tesla never filed. Members of that team were: Ivan Župunski, PhD, Snežana Šarboh, MSc, Bogdan Todorov, MSc, Ljiljana Kovačević, Jovan Perić and Slobodan Stojković, who spent six months at the Nikola Tesla Museum. In addition, the Federal Intellectual Property Office asked the European Patent Office (EPO) to send a copy of Tesla's patents that are available to the EPO, which they did very shortly thereupon. The patent specifications sent were analyzed in parallel to the Museum's archive, resulting in exceptionally large working material. However, due to circumstances, this material was neither systematized, nor published, except for only one report drafted and submitted thereupon by the expert team to the director of the Federal Intellectual Property Office. The importance of this report confirms the fact that therein, for the first time, was indicated the existence of Tesla's particular patents from other countries, which Tesla used to protect his inventions for which he had no adequate U.S. patents. Namely, this concerns 6 Tesla's patents from Great Britain, belonging to the last period of Tesla's work. The report mentioned above, served as a basis for making a selection of Tesla's patents published within [2]. In those four books, 112 of Tesla's U.S. patents, as well as the 6 patents from Great Britain, mentioned above, were published in both Serbian and English, which was a significant step forward, regarding earlier works that referred to Tesla's patents. Considering the importance of the research performed, as Tesla's inheritance was analyzed by the industrial property experts for the first time, and the need to establish a complete and accurate list of Tesla's patents, and being one of the direct participants of this research, I accepted the challenge to process the material gathered and make the obtained results available to the expert public, as well as a wider audience. The processing and study of this material, brought about a number of papers [4]-[9] about Nikola Tesla's patents, that were published successively, starting from 1999, in "Glasnik intelektualne svojine". Unification of these papers into a simultaneous presentation of new results that have been obtained in the meantime resulted in the paper that will be presented in the following part. III. NIKOLA TESLA’S U.S. PATENTS At the time when he was employed in Edison's company, Tesla worked on the development and improvement of dynamo-electric machines, and probably electric arc lamps. However, in this case, Edison usurped the results of another persons work and protected these inventions under his name. Therefore, the public is left without any information about Tesla's first inventions protected by patents. Looking at the list of Edison's patents from this period, one can only make guesses which of these patented inventions had been created by Tesla, and which ones by other of Edison's employees. This kind of Edison's attitude was the reason for conflict between them, but it can be assumed that in this period it was, that Tesla learned about the importance of protection of inventions and how to acquire patents for them. This is supported by the fact that immediately after leaving Edison's company and starting his own company "Tesla Electric Light & Manufacturing", Tesla filed his first patent application in the USA, for the electric arc lamp (patent application No. 160,574 from 30.03.1885, for which the patent No. 335,786 (shown in Fig. 1.) was granted). Before the end of that year, Tesla filed four more patent applications, one of which also related to electric arc lamps, and the other three to dynamo-electric machines and their regulators. The following year, 1886, Tesla filed only three patent applications, two of them concerning regulators for dynamo- electric machines, and the third concerning the thermo- magnetic motor. On the other hand, the U.S. Patent Office issued Tesla's first six patents, the first patent No. 334,823 relating to a commutator for dynamo-electric machines, although he filed this application on May, 6th, 1885, one month after he filed his first U.S. patent application mentioned above. scrupules to register inventions that had been developed by his employees to his own name, which often lead to conflicts among him and these employees and ended in them leaving Edison's company. During 1887, Tesla submitted six new patent applications. Except the first two applications, one relating to regulators for dynamo-electric machines and the other concerning the pyromagneto-electric generator, the other applications already belonging to the field of polyphase alternating currents and relating to motors and generators based on them. However, three of the applications mentioned, had to be divided, on request of the U.S. Patent Office. They believed that the subject of the application did not meet the conditions for unity of invention, so that Tesla had to derive one divisional application from each initial patent application, 252,132 from October 12th, 256,652 from November 30th, and 258,787 from December 23rd. And so the total number of Tesla's patents reached nine in 1887. However, this figure is not final. Namely, after having a look at the archive material that is kept at the Nikola Tesla Museum, it has been determined that besides the applications filed to the U.S. Patent Office, for which he received appropriate patents, Tesla also filed a number of applications that had not been approved for different reasons. An example is Tesla's patent application No. 239,481, filed 26.5.1887, from which Tesla divided a divisional patent application on 25.5.1889, under No. 312,069, for which Tesla received the Although it is known that Nikola Tesla started his work as an inventor back in the period of 1881-1882, when he worked in Budapest, at the Central Telegraphic Office, there is no information that he tried to acquire a patent for any of his inventions. The situation changed at the beginning of 1884, after he left for the United States of America, where he started to work for Edison's company Edison Machine Works. Edison was not just a great inventor, but also a smart businessman who successfully lead the company he founded himself and efficiently used the patent system to ensure himself the benefit of a monopolistic position on the market and adequate publicity, resulting in more than thousand U.S. patents. On the other hand, a great number of his patents are not entirely original. By them he only protected improvements of inventions made by other inventors. Edison also had noPDF Image | Nikola Tesla Patents
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