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Marconi transmitted radio signals for about 1.5 miles (2.4 km) at the end of 1895. [102] Marconi was awarded a patent for radio with British patent No. 12,039, Improvements in Transmitting Electrical Impulses and Signals and in Apparatus There-for. The complete specification was filed 2 March 1897.
This is the initial patent for radio-based wireless telegraphy. 1896: Bose goes to London on a lecture tour and meets Marconi, who was conducting wireless experiments for the British post office. 1897: Marconi establishes a radio station on the Isle of Wight, England.
[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]
Overall American Marconi's patent rights were sufficient to give it a leading role in the U.S., and in his review of radio industry legal disputes, W. Rupert MacLaurin noted that "The position of American Marconi was such that the threat of suit was often sufficient to cause an infringing firm to halt its operations."
The first practical radio transmitters and receivers invented in 1894–1895 by Guglielmo Marconi used radiotelegraphy. [5] It continued to be the only type of radio transmission during the first few decades of radio, called the "wireless telegraphy era" up until World War I , when the development of amplitude modulation (AM) radiotelephony ...
Using various patents, the British Marconi company was established in 1897 by Guglielmo Marconi and began communication between coast radio stations and ships at sea. [52] A year after, in 1898, they successfully introduced their first radio station in Chelmsford.
The matter from the old "Invention of Radio" text is all in History of radio, except for the Tesla and Marconi matter, which are in separate pages, as stated above. I have copied relevant matter about Tesla and Marconi into Great Radio Controversy, but I did not delete it from other pages. Anthony Appleyard 13:43, 22 September 2006 (UTC)
U.S. patent 685,956 - Apparatus for Utilizing Effects Transmitted through Natural Media - 1901 November 5 - Related to his Magnifying Transmitter; Used as part of Tesla's Colorado Spring receivers that posed a distributed high-Q helical resonators, radio frequency feedback, crude heterodyne effects, and regeneration techniques; an apparatus for ...