Jonas Matuzas on ECW open thread found that patent application by a Czech company https://patentimages.storage.g…61dca/US20190096535A1.pdf
THE METHOD OF GENERATING THERMAL ENERGY , DEVICES OF ITS IMPLEMENTATION AND HEAT GENERATION SYSTEMS
Applicant : POWER HEAT ENERGY S . R . O . , Nusle ( CZ ) (
Inventors : Oleg OLSHANSKY , Vary ( CZ ) ; Emanuel HUBENY , Praha 5 ( CZ ) ; Andrey KOLOSOV , Volgograd ( RU )
I've found 3applications on Wipo, the previous to USPTO another to Indian patent office, and another to canada.
https://patentscope.wipo.int/s…ail.jsf?docId=US239829561
https://patentscope.wipo.int/s…ail.jsf?docId=IN236856470
https://patentscope.wipo.int/s…ail.jsf?docId=CA228902500
the WIPO applications is
https://patentscope.wipo.int/s…il.jsf?docId=WO2017152889
EPO add a chinese and korean application, and cite the oricinal Czech patent
https://worldwide.espacenet.co…&NR=109074872A&KC=A&ND=4#
https://worldwide.espacenet.co…R=20190021195A&KC=A&ND=4#
https://worldwide.espacenet.co…&NR=2016136A3&KC=A3&ND=4#
It did not find anything decisive, but maybe I missed core points.