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Before the discovery of electromagnetic waves and the development of radio communication, there were many wireless telegraph systems proposed and tested. [4] In April 1872 William Henry Ward received U.S. patent 126,356 for a wireless telegraphy system where he theorized that convection currents in the atmosphere could carry signals like a telegraph wire. [5]
This "four sevens" patent — so named because Marconi's U.S. patent No. 763,772 was a counterpart to the original filing, British patent No. 7,777 — was also found to be invalid, with the court ruling that it had been anticipated by John Stone Stone's U.S. patent 714,756 as well as those by Lodge and Tesla. The verdict stated that “Marconi ...
1943: the Supreme Court of the United States, in a case on radio patents involving the U.S. government vs the Marconi Company, restores some of the prior patents of Oliver Lodge, John Stone Stone, and Nicola Tesla.
The paragraph :"Case against Marconi" in the entry "Invention of Radio" states that "However, he might have received a transatlantic signal at short wave frequencies (HF) because the early spark transmitters were only broadly tuned, and the Poldhu transmitter may have radiated sufficient energy in that part of the spectrum for a transatlantic transmission, if Marconi was using an untuned ...
[77] [33] Tesla sued Marconi's company for patent infringement but didn't have the resources to pursue the action. In 1943 the US Supreme Court invalidated the inductive coupling claims of Marconi's patent [78] due to the prior patents of Lodge, Tesla, and Stone, but this came long after spark transmitters had become obsolete. [71] [63]
In 1915, Tesla attempted to sue the Marconi Company for infringement of his wireless tuning patents. Marconi's initial radio patent had been awarded in the US in 1897, but his 1900 patent submission covering improvements to radio transmission had been rejected several times, before it was finally approved in 1904, on the grounds that it ...
An employee of the Marconi Company, England, 1906 Marconi Wireless Station in Somerset, New Jersey, in 1921 Marconi advertisement from the 26 October 1923 issue of The Radio Times, threatening prosecution for infringements of Marconi patents . Marconi's "Wireless Telegraph and Signal Company" was formed on 20 July 1897 after a British patent ...
US government recognised Radio patent to Tesla post mortem of both Marconi and Tesla; since you-Wikipedians need sources here you have two (I could provide more in case): Margaret CHENEY Tesla · Man Out of Time, Touchstone, USA, 1981 Tesla · Man Out of Time. Müzej Nikole Tesle, Beograd, Serbia (Nikola Tesla Museum). I have been visiting ...