Radio & Wireless
Patents and Inventions
Invented by Guglielmo Marconi in 1869 (GB patent No. 12039)

Though many contributors, radio transmission was invented by Guglielmo Marconi in 1869 (GB patent No. 12039)

Title Primary Class Description Inventor Assignee Issue Date Patent No.
Improvement in collecting electricity for telegraphing 307/149 This patent hasn't any practical or scientific meaning. An electrical layer in the atmosphere that could carry signals like a telegraph wire between grounded towers that must be in constant contact with this layer that surrounds the earth (similar to Mahlon Loomis patent No. 129971). William H. Ward
April 30, 1872 US126356
Mode of electric communication 370/499 This device relied on conduction in the ground. Phones were grounded by metal rods poked into the earth. Transmission range was half a mile. The Dolbear patent prevented the Marconi Company from operating in the United States primarily because it was similar to the 1896 model of Guglielmo Marconi. In the end, Marconi had to purchase Dolbear's patent. Amos Emerson Dolbear Dolbear Electric Telephone Company, New Jersy October 5, 1886 US350299
Method of operating arc lamps 315/246 An alternator that produced radio high-frequency current of around 10,000 hertz. Tesla suppressed the disagreeable sound of power-frequency harmonics produced by arc lamps operating on frequencies within the range of human hearing. The produced pulsations were in the longwave broadcasting range (LF) and very low frequency band (VLF). Nikola Tesla
March 10, 1891 US447920
System of electric lighting 454,622 A high-frequency coupled oscillator circuit with an air-cored transformer (early disruptive "Tesla" coil) which converts low-frequency currents into "current of very high frequency and very high potential", which then supplies single-terminal lamps. Nikola Tesla
June 23, 1891 US454622
Means for transmitting signals electrically 178/43 An electromagnetic induction system Edison called "grasshopper telegraphy", which allowed telegraphic signals to jump the short distance between a running train and telegraph wires running parallel to the tracks. This system was successful technically but not economically, as there turned out to be little interest by train travelers in an on-board telegraph service. Thomas Alva Edison
December 29, 1891 US465971
Improvements in Transmitting Electrical Impulses and Signals, and in Apparatus therefor. -- This Marconi patent is the first description in print of a wireless telegraphy device (US586193; RE11913). Guglielmo Marconi
July 2, 1897 GB12039
Transmitting electrical signals 178/116 RE11913; GB12039 Guglielmo Marconi
July 13, 1897 US586193
Electrical transformer 307/149 An early Tesla coil, developed currents of high potential and was composed of a primary and secondary coil where the secondary being inside of, and surrounded by, the convolutions of the primary coil. The apparatus was also connected to ground when the coil was in use. Nikola Tesla
November 2, 1897 US593138
Electric telegraphy 178/116 By the making of the antenna coil or inductance variable, Lodge introduced the important concept of tuning in order to select a desired station (the "syntonic" tuning concept). In 1912 Lodge sold the patent to Marconi, and it was upheld in the 1943 Supreme Court decision. Oliver Joseph Lodge
August 16, 1898 US609154
Method of and apparatus for controlling mechanism of moving vessels of vehicles 318/16 Wireless remote control of boats. Employed the first logic gate and rotating coherers, allowed secure communication between transmitter and receiver. Nikola Tesla
November 8, 1898 US613809
System of transmission of electrical energy 375/259 An early Tesla transmitter consisting of a flat-spiral quarter-wave resonator and an elevated terminal. It was upheld in the 1943 Supreme Court decision. Nikola Tesla
March 20, 1900 US645576
Apparatus for transmission of electrical energy 455/39 Fundamental means for transmitting and receiving radio waves and energy. Build from a signal generator, primary and secondary coils at the transmitting and receiving stations. Nikola Tesla
May 15, 1900 US649621
Improvements in the Method of and Means for Transmitting and Receiving Electric Waves for the Production of Signals and for Imparting Motion to Machines or Apparatus. -- Basic wireless system Julio Cervera Baviera
July 21, 1900 GB20084
Improvements in Apparatus for Wireless Telegraphy. -- US patent No. 763,772, see below. Guglielmo Marconi; Marconi’s Wireless Telegraph Company, London.
April 13, 1901 GB7777
Transmitting electrical impulses and signals and apparatus therefor 178/116 A primitive spark gap transmitter and receiving station with no tuning at all, would operate only over very short distances. The transmitter used a Ruhmkorff coil, Morse key, rotary spark gap; receivers used a coherer detector. It used various earlier techniques and instruments of various other experimenters, primarily Tesla and also Popov. Later claimed by Oliver Lodge to contain his own ideas which he failed to patent. Invalidated by the Court of Claims decision from 1935. (Original No. 586193; GB12039). Guglielmo Marconi Marconi’s Wireless Telegraph Company, London. June 4, 1901 RE11913
Apparatus for wireless telegraphy 178/116 This system was more advanced than Marconi's previous works by enabling tuning capabilities by the inclusion in the aerial circuits, at both the transmission and receiving stations, variable induction coils. Guglielmo Marconi Marconi's Wireless Telegraph Company, London June 11, 1901 US676332
Telautomotor 114/21.2 Wireless remote control of boats and other moving objects Harry Shoemaker Gustave P. Gehring; Marie V. Gehring October 21, 1902 US711743
Method of selective electric signaling. 370/339 An adjustable tuneable antenna circuit design (LC) for removing parasitic oscillations in the transmitter. Upheld in the 1943 Supreme Court decision against Marconi's patent 763772. John Stone Stone Louis E. Whicher; Alexander P. Browne; Brainerd T. Judkins December 2, 1902 US714756
Wireless telegraph repeater 375/211 A wireless telegraph repeater which object is to make it possible to signal between stations more widely separated that before by inserting between such stations a repeating station which receives radiant energy from the transmitting station, and providing means for entirely insulating the wave responsive device at the repeating station before the transmitted energy is produced. Harry Shoemaker Marie V. Gehring; The Consolidated Wireless Telegraph and Telephone Company, Philadelphia. January 13, 1903 US718535
Detector for electrical disturbances 257/41 Coherer detector and the earliest photovoltaic cell. The first patent awarded for a semiconductor device even if “semiconductor” wasn’t termed yet. Basically a pair of point contacts of galena connected in series with a voltage source. Jagadis Chunder Bose Jagadis Chunder Bose; Sara Chapman Bull March 29, 1904 US755840
Method of communicating intelligence by wireless telegraphy 178/116 Telegraph tone system which diminished the time needed to deliver a signal - the use of two signals of different frequencies for the "dot" and the "comma" of the Morse code. Joseph Murgas
May 10, 1904 US759826
Apparatus for wireless telegraphy 178/116 A four-circuit design, which featured two tuned-circuits at both the transmitting and receiving antennas in order to prevent the restriction of the number of spark-gap radio transmitters which could operate simultaneously in a geographical area without causing mutually disruptive interference. Found to be invalid in the 1943 Supreme Court decision. (GB7777). Guglielmo Marconi Marconi's Wireless Telegraph Company, London June 28, 1904 US763772
Method of increasing the effective radiation of electromagnetic waves 343/849 Transmission of signals by electromagnetic waves from an elevated conductor (antenna). John Stone Stone William W. Swan August 16, 1904 US767973
Instrument for converting alternate electric currents into continuous currents 329/370 Rectifying vacuum tube diode (GB24,805). John Ambrose Fleming Marconi Wireless Telegraph Company November 7, 1905 US803684
Wireless transmitting and receiving mechanism for electric waves 178/117 Wireless remote control system that prevents disturbances from other electromagnetic resources. Christian Hulsmeyer
January 16, 1906 US810150
Wireless telephony 178/116 A system of wireless telephony using an electric arc light that enables high voltage and amperage without to damage the transmitter. Archie Frederick Collins
March 13, 1906 US814942
Wireless telegraph system 455/137 To reduce false signals received by employing a few distinct receiving devices working in parallel. Harry Shoemaker Marie V. Gehring; International Wireless Telegraph Company, New Jersy. June 26, 1906 US824676
Means for receiving intelligence communicated by electric waves 423/348 A silicon crystal point-contact radio detector - a fine pointed wire (cat's whisker) in delicate contact with the silicon crystal. Greenleaf Whittier Pickard
November 20, 1906 US836531
Space telegraphy 329/368 Vacuum tube (valve) triode. Lee De Forest De Forest Radio Telephone Co., New York February 18, 1908 US879532
Wireless telephone 178/43 Means for electrically transmitting signals for securing telephonic communication between moving vehicles and way stations. Nathan B. Stubblefield Conn Linn; R. Downs; B. F. Schroader; George C. Mclarin; John P. McElrath; Jeff D. Roulette; Samuel E. Bynum May 12, 1908 US887357
High frequency alternator 310/169 The Alexanderson mechanical alternator: a high-frequency generator, up to 100 kHz, for longwave transmissions, which made modulated (voice) radio broadcasts practical. Ernst F. W. Alexanderson General Electric Company, New York November 14, 1911 US1008577
Wireless receiving system 375/339 The regenerative circuit. Edwin H. Armstrong
October 6, 1914 US1113149
Selective tuning system 455/291 Tunning and frequency selection by a push-pull configuration. Ernst F. W. Alexanderson General Electric Company, New York February 22, 1916 US1173079
Method of receiving high-frequency oscillations 455/315 Superheterodyne receiver Edwin H. Armstrong
June 8, 1920 US1342885
Radio signaling system 455/205 Frequency Modulation (FM) receiver. Edwin H. Armstrong
December 26, 1933 US1941066
Transistor radio apparatus 455/334 Transistor Radio Richard C. Koch I. D. E. A., Incorporated, Indianapolis June 30, 1959 US2892931

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