| US | 164458 | Improvement in pyrophones | Frederic Kastner | 1873 | - | Hydrogen flame in tubes pipe organ |
| US | 201760 | Speaking Machine | Edison | 1878 | - | Compressed air, nearly massless for ref |
| US | 580035 | Art of and apparatus for generating music | Cahill | 1897 | - | Telharmonium |
| GB | 21629 | Singing arc | Duddell | 1900 | A | Convert DC to audible AC using arc |
| GB | 190215527 | Improvements in or relating to wireless... | Blondel | 1903 | A | Speaker, mic and circuits based on Duddell |
| GB | 15599 | ? | Poulsen | 1903 | - | Radio transmitter based on Duddell |
| GB | 190604585 | Improvements in and relating to | Hermanus | 1906 | A | Arc microphone, piston against electrode |
| GB | 190628125 | Improvements in wireless telephony | Forest | 1907 | A | Uses Duddell and Simon's speaking arc |
| GB | 191407202 | Improved method of trans | Stille | 1915 | A | Arc microphone (reverse of singing arc) |
| GB | 264811 | Improvements relating to elec | General Electric | 1927 | B | Point to plane corona discharge |
| GB | 265958 | Improvements relating to elec | General Electric | 1928 | C | Points on a disc corona wind. |
| US | 1680694 | Sound reproducing method and apparatus | Ramsey | 1928 | B | Horn loaded plasma speaker mod RF |
| US | 1685075 | Intertransposition of sound | Lindenblad, RCA | 1928 | C | Point to air/ground corona discharge. 189 patents!, Swedish |
| US | 1723244 | Method of and apparatus for reproducing sound | Lilienfeld | 1929 | C | Modulate air flow around disc |
| US | 1702951 | Sound-emitting apparatus | Ruben | 1929 | B | Horn loaded plasma |
| GB | 303175 | Loudspeaker arrangement | Loewe | 1930 | C | Grid modulated ion source |
| US | 1758993 | Sound reproducer | Wolff | 1930 | C | Many points corona discharge. Ref to above patent 1695075 wrong! |
| US | 1751888 | Sound-emitting device | Ruben | 1930 | C | Heated cathode ion speaker |
| US | 1806745 | Sound Producing Device | De Forest | 1931 | B | Modulate gas flow with high voltage |
| US | 2768246 | Electrical Transducer | Klein S. | 1956 | B | Ionovac, Also-GB756546, CH317527, DE1095883, FR1041790, US2768246 |
| GB | 757358 | Improvements in or relating to | Klein S. | 1956 | B | Ionovac, Also-US2847516, GB757111, FR1041790, BE519086, FR67664E |
| US | 2793324 | Ionic triode speaker | Halus, Holcomb | 1957 | B | Corona discharge around a hole |
| GB | 792312 | Improvements in and relating to | Klein S. | 1958 | B | Multi horn Ionovac |
| US | 2949550 | Electrokinetic apparatus | Townsend Brown | 1960 | C | Corona wind |
| US | 3105124 | Inertialess Transducer | Torn | 1963 | B | Dukane ionovac |
| US | 3185778 | Apparatus for producing sound | Gianni, Ducati | 1965 | B | Horn loaded plasma |
| FR | 1427695 | Appareil sonore electrohydro | Electrokinetics | 1966 | C | Corona wind wire with backplate shapes |
| US | 3018394 | Generation and transmission | Townsend Brown | 1967 | C | Corona wind |
| US | 3476887 | Ionic electroacoustic transducer | Seligson, Lanier | 1969 | C | Many points to blades corona wind (blades all vertical, points only one side) |
| GB | 1199859 | Method etc. generating an acoustic output | United Aircraft Corp | 1970 | B | Modulating flame with high voltage, US3565209 |
| GB | 1274875 | A system for imparting movem | Townsend Brown | 1972 | C | Corona triode with vertical bars+wires. |
| DE | 2115544 | Koronaphon | Walter | 1972 | B | Circuit for a plasma loudspeaker (modulated supply?) |
| FR | 2246151 | none | Doucet, Henri | 1975 | C | Corona wind |
| JP | 5167735 | Diaphragm on ionic speaker | | 1976 | B | Plasma speaker with diaphragm(!) to stop gas |
| JP | 53141612 | Grid controlled ionic wind loud | Kiyoshi | 1978 | B | Corona triode, wires, single ended and push pull. |
| JP | 53142218 | Ionic Wind Loudspeaker | Kiyoshi | 1978 | B | Corona triode, just single ended, points |
| JP | 53137128 | Ionic Wind Loudspeaker | Kiyoshi | 1978 | B | Corona triode, points, single ended and push pull. |
| GB | 2023373 | Plasma Loudspeaker | Hill | 1979 | B | Plasmatronic, glow discharges in parallel. US4219705, JP54143225, JP2918300, FR2422314, DE2913804 |
| JP | 54119914 | Ion Speaker | Hatake Kiyoshi | 1979 | B | Replaceable plasma speaker tube |
| EP | 17885 | Corona-effect loudspeaker | Klein S. | 1980 | B | Magnat |
| EP | 17886 | Corona-loudspeaker | Klein S. | 1980 | B | Magnat |
| US | 4306120 | Sound emitter | Klein S. | 1981 | B | Magnat/Ionovac |
| EP | 65911 | Ionic electro-acoustic transducer | Bondar | 1982 | C | Plasmasonic, Also-US4460809, JP58001395, FR2506551, EP0065911 |
| US | 4460809 | Process and device for converting a periodic... | Bondar | 1984 | C | Ionic pins and plates |
| US | 4464544 | Corona-effect sound emitter | Klein S. | 1984 | B | Magnat |
| FR | 2544951 | Corona effect loudspeaker | Klein S. | 1984 | B | Magnat |
| US | 4482788 | Transducer for the transformation | Klein S. | 1984 | B | Also EP0017886, SU1175352, JP55140400, FR245444, ES8100754 |
| FR | 2588710 | Ionic electroacoustic transducer | Deraedt | 1987 | C | Push-pull corona wind |
| WO | 8807785 | Electrokinetic transducing met | Lee | 1988 | C | Corona wind, Offset wires to thicker bars. |
| US | 4789801 | Electrokinetic transducing met | Lee | 1988 | C | Corona wind, Offset wires to thicker aerodynamic bars. |
| EP | 370846 | Electroacoustic Transducer | Fourriere | 1990 | C | Tolteque, Corona/Glow modulated by plates. JP2174398, FR2638930 |
| FR | 2685156 | Tranducteur electroacoustique, et enceinte... | Bayle Pierre, Gibert Alain | 1991 | C | Many point to plane corona? |
| JP | 4027300 | Method and device for arc sound | Eizo | 1992 | A | Arc/flame nozzle, a TIG welder |
| US | 5220246 | Method and apparatus for tran | Ide, Hashimoto | 1993 | A | Possible glow discharge (arc column), single point to plane. Based on DC TIG welder. |
| JP | 6327099 | Speaker utilizing DC corona dis | Masaaki | 1994 | B | Point to plane corona discharge,+ push pull |
| GB | 2312590 | Corona Discharge Loudspeaker | Howard | 1997 | C | Corona wind wires with grids either side. |
| GB | 2403372 | Corona Discharge Loudspeaker | Chambers | 2004 | C | Corona wind |
| WO | 127810 | Electroststic Loudspeaker and ... | Krichtapovitch | 2007 | C | Kronos EPA application (not granted yet, company closed), corona wind |
| JP | 20082326235 | Headphone | Audio Technica KK, Akino Yutaka | 2007 | B | Plasma headphone |
| JP | 2010141858 | Sound generator | Sony Corp | 2008 | B | Sony's attempt at a plasma tweeter design |
| CN | 101778327 | Electricity and sound conversion... | Yao Zongdong | 2010 | B | Plasma speaker controlled by magnetic field, or not the translation is vague |
| CN | 202218397 | Plasma loudspeaker | Zhao Ge, Gao Yifeng, Cao Dong | 2011 | B | Plasma speaker, classic style with two electrodes, a reflector behind |
| DE | 102010026112 | Plasma tweeter e.g. teslums tweeter, for e.g. acoustic lab | Braun Alexander | 2012 | B | Plasma speaker on tesla coil |
| RU | 2496254 | Electric-arc loudspeaker | Boris G. Viger | 2012 | B | Plasma tweeter EAL/VA7 of Viger Audio/Plasma Voice |
| CN | 101820573 | Control device for plasma loudspeaker and plasma loudspeaker | Lu Yulong | 2013 | B | Plasma speaker amp |
| JP | 5281428 | Microphone | Yu Akino | 2013 | B | Plasma based microphone |
| JP | 5474614 | Electroacoustic transducer | Yu Akino | 2014 | B | Plasma speaker |
| JP | 5777540 | Electroacoustic transducer | Yu Akino | 2015 | B | Plasma speaker and microphone |
| CN | 105763985 | Plasma loudspeaker earphone | Shi Peng | 2016 | B | Plasma headphone |
| CN | 205902064 | Electron tube ionic loudspeaker | Zhang Zaifei | 2017 | B | Basic plasma speaker valve amplifier |
| JP | 6099143 | Electroacoustic transducer | Yu Akino | 2017 | B | Plasma speaker |
| CN | 107948895 | Microwave plasma loudspeaker | Fu Wenjie | 2018 | B | Microwave generated plasma |
| CN | 110430515 | Improved plasma loudspeaker | Hu Zhenqiang | 2019 | B | Circular arrangement of plasmas |
| WO | 2019135196 | Electronic effects device and method | Ilja KRUMINS, Martins MELKIS, Kristaps KALVA | 2019 | B | Plasma in a gas discharge tube |
| EP | 3513576 | Plasma speaker | Gilligan | 2020 | B | Multiple small plasma tweeters to create a full-range plasma |
| US | 201862627839 | System and Method for Acoustic to Electronic Transduction | Johan Carlsson | 2020 | B | Plasma microphone for structural listening |
| EP | 4116967 | Plasma Based Noise Reduction System | Sergeev Stanislav, Lissek Herve,Volery Maxime | 2023 | C | Corona Wind Speaker used for Noise Reduction |
