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There's this, for a start:

https://www.google.com/patents/US4349898

If there are patents, one can be sure that these things exist.

And logically, the CIA and US military would love sonic weapons. They can target people and have others think they're just crazy and paranoid. Good way to take down your opponents and damage their credibility.

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There's also this patent for a "free" energy source: https://www.google.com/patents/US6362718 (https://en.wikipedia.org/wiki/History_of_perpetual_motion_ma... has many more similar patents.)

Patents do not require showing that the described invention actually works, it just needs to be different enough from prior art to qualify.

That doesn't mean that sonic weapons don't work (I believe it's possible), but a patent alone is not enough.

How about US6960975? So, what you're saying is that we've been wrong all along about perpetual motion machines.

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