1893, nikola tesla publicly demonstrated radio communication for the first time in St. Louis, Missouri, USA. In his reports to Franklin College in Philadelphia and the National Electric Association, he described and demonstrated the basic principles of radio communication. The instrument he made contained all the basic components of the radio system before the invention of the electron tube.
Guillermo Marconi holds the British patent number, which is widely regarded as the world's first patent on radio technology. 12039, "improvement of electric pulse and signal transmission technology and necessary equipment".
Nikola tesla obtained the patent of radio technology in the United States on 1897. However, in 1904, the US Patent Office revoked its patent right and granted Marconi a patent for inventing radio instead. This move may be the result of Marconi's economic supporters in the United States, including Thomas Edison and andrew carnegie. 5438+0909, Marconi and karl ferdinand braun.
1943, shortly after Tesla's death, the US Supreme Court reconfirmed the validity of Tesla's patent. This decision admitted that his invention had been completed before Marconi's patent. Some people think that this decision is obviously for economic reasons, so that the US government in World War II can avoid paying Marconi's patent royalties.
1898, Marconi opened the world's first radio factory in Hall Street, chelmsford, England, with about 50 employees.