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[5] at the end of August 2003, I published one list of Nikola Tesla's patents that included 141 patents from 26 countries. Although this list contained 32 more patents, completely unknown up to that moment, than the list mentioned before, at the moment of its publication there were already some indications that it is not final, either. Further adding to this list, that was continued, was based on my own and the efforts of Mr. Slobodan Stojković, resulting in complete bibliographical information and patent specifications for another 25 of Tesla's patents, except a part of bibliographical data concerning patents No. 47012 and 47885 from Germany, the source for which was [3]. The results of this research will be presented soon in appropriate monography. The current list contains bibliographical information about 166 patents from 26 different countries, whereby it is necessary to note that the survey of patents is given separately for New South Wales and Victoria, and for Australia, which the two previously mentioned British colonies became part of in 1901. Now the patent No. 199580 from Germany has been removed finally from the list of Tesla's patents in countries other than the United States. There is a copy of this patent's drawings in the archive of the Nikola Tesla Museum, but other parts of the document are missing. By analyzing the corresponding patent specification downloaded from the web site of the German Patent Office, it has been found that the patentee of this patent was Paul Lupa, for the invention titled "Spülversatzleitung mit inneren Querrippen zur Erzeugung einer zusammenhängenden, schützenden Kruste aus dem Versatzgut". The document probably came into Tesla's possession because the Imperial Patent Office in Berlin, Germany put it in opposition to Tesla's patent application titled "Valvular Conduit", protected by the U.S. patent No. 1,329,559. On the other hand, the current list includes bibliographical data about 13 unknown patents until now from Belgium, 13 from Great Britain, 2 from Danmark, 1 from Italy, 5 from Canada, 4 from Germany, 1 from Norway, 2 from Sveden and 16 from France, i.e. total of 57 unknown Tesla's patents compared to the list published in [1]. Tesla had most approved patents in Great Britain and France - 29 in each country, and a little surprising is the fact that he had 24 patents in Belgium, while having 18 patents in Germany and 12 in Italy. Tesla had a significantly lower number of granted patents in other countries, which goes from 1 to 7. As noted in the text "Nikola Tesla's patent's" in the [1], up to the present day, the general opinion was that on the list of Tesla's patents approved in countries other than the United States, "there were no patents from the field of power systems and that the first patents refer to Tesla's arcing oscillator, from 1891". However, analyzing the aforementioned list of patents Tesla registered in countries other than the United States, it is obvious that the real situation is essentially different. Tesla already began to file patent applications in countries other than the U.S. one year after he filed his first patent applications in the United States. His first patent application outside the U.S., Tesla filed in Great Britain on 9.2.1886, for improvements in electric arc lamp and received patent No. 1,877 (shown in Fig. 2.) for it. In the same year, in Great Britain, he also filed a patent application for improvements in regulators for dynamo-electric machines, and shortly after he filed a patent application for the same invention in Canada. In 1888, he began to protect his inventions related to polyphase alternating currents and corresponding motors and generators, in Germany and France, and the following year in Belgium, too. This completely changes all we know about Tesla's activities related to the protection of his inventions outside the United States, and shows that these activities began 5 years earlier than it had been previously thought. Also surprising is the scope of his activities. Namely, between 1886 and 1890, Tesla filed applications in the specified countries and received a total of 24 patents. Fig. 2. The first page of patent specification of the British patent No. 1,877 Tesla's activity related to the protection of his inventions in countries other than the U.S. covers the period from 1886 to 1922, which means that it lasted 36 years, 7 years less than in the Unites States. It is obvious that there had been big differences in the number of filed patent applications from year to year, a few years being exceptional in regard to this: 1889 (one of them is shown in Fig. 3.), 1898, 1900, 1901, 1910, 1921 and 1922. In every one of these years, Tesla filed more than 10 patent applications.PDF Image | Nikola Tesla Patents
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