A few years ago there was a crowdfunded instant cold brew machine based on acoustic cavitation called Osma.[1] I don't think it's still in production. I met the founder during testing at Chromatic Coffee in San Jose, and took delivery of one of the first units. Cool concept, but it didn't work very well

[1] https://www.engadget.com/osma-pro-cold-brew-coffee-machine-r...