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Not only can you, but many people have: https://en.wikipedia.org/wiki/Perpetual_motion#Patents https://en.wikipedia.org/wiki/Perpetual_motion#Patents

• catalogia 7y ago
  From that what that link says, it sounds like you could but now cannot patent perpetual motion devices, since those applications are now rejected in America and UK. Perhaps you can patent them elsewhere though.
  • ganzuul 7y ago
    IIRC they are not rejected but you have to demonstrate the invention with a physical implementation. Of course this proves nothing but it does reduce the amount of paperwork. There is legitimate research going on into reversing the casimir effect but the narrative they present is one of tribology rather than power generation.
  • bra4you 7y ago
    " it sounds like you could but now cannot patent " I am afraid such small distinctions are beyond the mental capabilities of most HN readers. I have more and more the impression of dealing with 16 y olds on HN