Professor Alexander Chernetsky at the Moscow Georgi Plekhanov Institute discovered the power benefits of tapping vacuum plasma energy. He build a new type of high-frequency plasma generator that could give out power almost 5 greater than the energy it consumed. He came to the USA and like all free energy inventors died suddenly. He had a car "accident".
Did Big Oil eliminate him? Most likely. He threated the biggest cartel on the Earth with his invention.
They most certainly did, and a lot of others too.
"... and no-one has taken up his research." Another dead end; literally.
And where is the research? SkunkWorks?
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