Discharge tubes functioning as thermionic generators

Official title: Discharge tubes functioning as thermionic generators {(structural combination of fuel element with thermoelectric element G21C3/40; nuclear power plants using thermionic converters G21D7/04; structural combination of a radioactive source with a thermionic converter, e.g. radioisotope batteries G21H1/10; generators in which thermal or kinetic energy is converted into electrical energy by ionisation of a fluid and removal of the charge therefrom H02N3/00)}

H01J45/00 (Discharge tubes functioning as thermionic generators) appears on 186 US grants and 204 published applications in this corpus.