https://ploum.net/working-with-patents/
> Note that by « valid », I mean that the Patent Office didn’t found a trivial prior art for this. It doesn’t mean that there is no prior art or that I’m the real inventor or that my invention works.
An example of an insane patent:
https://www.google.com/patents/US6960975
> Space vehicle propelled by the pressure of inflationary vacuum state US 6960975 B1
(via https://www.metabunk.org/do-patents-mean-the-invention-works... )