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when Tesla again filed a larger number of applications, namely 9 in 1896, and another 6 applications in 1897, and one divisional application, after which he filed another 6 patent applications in 1898. In the following two years, Tesla filed a smaller number of applications, but the U.S. Patent Office insisted on having them divided, so that the number of filed applications in 1899 increased from 2 to 4, and in 1900 from 4 to 6 applications. In the following year, Tesla filed 2 applications, and in 1902 only one. In the beginning of the specified period, most applications dealt with high frequency alternating currents and electric circuit controllers. Later, Tesla focussed more on radio and remote control, and electrical energy transmission through natural media. With this series of patents, Tesla's activity on filing patent applications from the field of electrotechnics, ended. The next patent application in the USA, Tesla filed in 1909, and it was from the field of mechanical engineering, but it had to be divided into two separate applications, following the request of the U.S. Patent Office - one for Tesla's pump and the other for Tesla's turbine. After a new pause, in 1913 and 1914, Tesla filed one application for a speed indicator and the other for a fountain. A sharp increase in the number of patent applications filed, followed in 1916, when a total of 6 applications were filed, for inventions including a lightning protector, a valvular conduit, a flow meter and others. The last two applications, for which he acquired patents, the first being a basic application, the other one being an additional application, Tesla filed in 1921 and 1927, the subject of which was a method of and apparatus for aerial transportation. patent No. 428,057, for an invention named the pyromagneto- electric generator. However, after looking at the list of Tesla's U.S. patents, it is obvious he did not acquire a patent for the initial patent application No. 239,481. Based on the preserved data, it seems that this patent application was rejected. Fig. 1. A page of patent specification of U.S. patent No. 335,786 This means that the number of patent applications filed by Tesla, in some years was higher than the number specified here, which refers only to patent applications for which Tesla acquired patents. Tesla's activity on filing patent applications increased during the two following years. In 1888, he filed ten patent applications, one of which was divided, which brings the final number of Tesla's patent applications to eleven. The following year, 1889, Tesla filed fifteen patent applications, which is the biggest number of patents filed in one year throughout his whole career. In the following year, 1890, the number of patent applications filed was significantly lower, only six. The inventions Tesla requested protection for through patent applications in the three years mentioned, mainly dealt with polyphase alternating currents. During 1891, Tesla filed 7, in the following year only 3, and in 1893 he filed another 6 patent appplications. The subjects of these applications still mainly concerned polyphase currents and their application, e.g. for lighting, electric railways, and other. It is interesting that in this period Tesla received his first two patents in the field of mechanical engineering, for the reciprocating engine and the steam engine. In the meantime, the focus of Tesla's work shifted towards high frequency alternating currents. This caused a two year pause in filing patent applications, after which came a period According to the current list published in [4], Tesla had 112 registered U.S. patents. Based on comparison of this list to other available sources, it can be assumed that this is the final number of Tesla's U.S. patents. The list does not include patent No. 613,819 any longer, which had been associated with Tesla's name. By looking at the corresponding patent specification it was found that this patent refers to an invention under the title of "Illuminating torch" by inventor George Kelly from Mineral Point, Wisconsin. Instead, in the afore-mentioned list is included Tesla's reissued patent No. 11,865 relating to method of insulating electric conductors, the respective specification of which is amended to a certain extent compared to the one of corresponding patent No. 655,838. IV. NIKOLA TESLA’S U.S. PATENTS REGISTERED IN OTHER COUNTRIES THAN THE UNITED STATES Except in the United States, Nikola Tesla also protected his inventions in other countries. Contrary to the list specified above, that contains 112 of Tesla's patents and which could be claimed to be final to a high degree of certainty, the work to establish a corresponding list of Tesla's patents in countries other than the United States, has not been finished yet. The list of patents given in the [1] containing 109 patents that Tesla had acquired in 25 different countries, has already been addressed. In the journal "Glasnik intelektualne svojine", inPDF Image | Nikola Tesla Patents
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