Thanks to Wahid Gurdien for pointing out that a patent application by Andrea Rossi to the Australian Patent office has now been opened on their website:
The title is: ELECTRIC ENERGY GENERATOR AND ELECTRIC ENERGY GENERATION METHOD, and it was filed in December 2021.
Here is the abstract:
The creation of these virtual particles is favoured by the high density of allowable energy states in vacuum, while they are hindered by the relatively low number of permitted states in an ordinary metallic conductor. This difference may be exploited to generate a high efficiency electric energy generator and this is what this invention has been made for.
The objective is solved by An electricity generator set made by a conductive hollow enclosure, made by metals or quartz containing conductors, connected with a power source that powers an electron gun made by a tungsten-hafnium alloy, upon which is a grid, so that the electrons hit a target at the opposite side, while a magnet forces the
electrons to run in straight line toward the target, and the enclosure is grounded until its hollow is saturated, so that when it is saturated MOSFET impedes the electrons to go to ground, and a diode has to allow the
electrons go to a capacitor and from the capacitor to a load.
The full patent can be downloaded at the link above.