The US Military patents tons of wild ideas that are almost certainly impossible but they want dibs on it
The US patent system doesn’t require that you demonstrate that the thing you’re patenting actually works, just that you detail what it is and how it would work. There are tons and tons of patents out there for systems and ideas that can’t work, or that no one would bother implementing
Anything really good is just classified not patented. Patents have the disadvantage of needing to be published so most important things in industry are held as trade secrets, and in the government they’re classified. The really really good stuff is classified top secret with compartmentalized access so even if you have clearance, unless it directly applies to the work you do you can’t know
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