Although a quick search of the USPTO suggests that brake manufacturer extraordinaire Brembo S.p.a. holds only a paltry few-score US patents, the most visceral piece of IP they own IMO is the totally mesmerizing sound that their motorcycle brakes make.
My bike’s front brakes are twin 320mm semi-floating discs with 4-piston 4-pad calipers. The noise is something of a cross between that dull buzz you get from the insects at night out in a field mixed with something mechanical – like a low whirring of ball bearings being spun. I can’t really put it into words. All I know is that it’s distinctive, memorable, lovely, and makes me smile! They should get a trademark on that noise! Fantastico!