It's probably bullshit. If there would be an effect that can be reliable recreated using only a CRT and certain modulations it should not be hard to setup a double blind placebo controlled study and become famous. I presume there was and is a lot of research regarding electromagnetic waves and their influence on the human body and if you exclude effects that are caused by very high energy electromagnet waves like heating tissue or effects on the brain when using a helmet and lot's of energy nothing was ever reliable shown that would work on a CRT.

Hell, if brown note was real don't you think in the last 50 years either bored students would have attempted to implement that on campus or law enforcement would use it to disperse crowds. If this would work reliably every facility that has access to equipment to create such waves would have probably a setup to expose the new guys/students to these effects for the amusement of all.

Maybe I'm naive but extraordinary claims warrant extraordinary evidence. If this works we would have heard about it by now.

But well - if you search for the patent you are pretty much in tinfoil hat land - no amount of scepticism or reason will help there.