ALEXANDRIA, Va., Sept. 15 -- United States Patent no. 12,739,962, issued on Sept. 15.

"Electron beam generation apparatus and electron beam generation method" was invented by Tomonao Hosokai (Osaka, Japan), Yanjun Gu (Osaka, Japan) and Zhan Jin (Osaka, Japan).

According to the abstract* released by the U.S. Patent & Trademark Office: "An electron beam generation apparatus includes a supersonic nozzle configured to generate the supersonic gas flow flowing along a first direction under a vacuum atmosphere; a knife edge configured to be inserted into the supersonic gas flow from one side in a second direction intersecting the first direction and form a shock wave in the supersonic gas flow; and a radiation unit configured to radiate the puls...