If he hadn't discussed this on here first, he would have had a shot at a patent - the other criteria are not that hard to satisfy in this case (I have a bunch of patents, so I know the criteria fairly well). The toughest thing in those criteria in this case is that multi scale patents may have been written broadly enough that this is already covered (a smart patent lawyer has probably already patented multi scales in general, not just the ones where the lower tuned strings are longer). if that's the case, you've lost "novel" so you're dead in the water. Either way, discussing your invention in public - even just once (an online forum is definitely public) means the idea is no longer patentable, as it's in the public domain. So, next idea you have that you think might be patentable, don't tell us until after you've filed for a patent. One of my patents (the coolest idea I ever had during my career), the idea was rolling around in my head for 15 or 20 years before we started working on it - there was a problem that I couldn't resolve, but when we started making the first prototype, the solution erupted in my brain in the wee hours one morning. As I didn't talk about it with anyone outside my company before we filed, we were able to patent that idea. Now, if only my company (I have since retired) were to make that product.....
Appreciate the feedback from someone who has been there and done that. My amateur/layman read would be that it isn’t new/novel or “not obvious” in that this sounds like flipping the orientation of the neck & strings based what is already being used for fanned fret designs. Maybe I’m misunderstanding the OP, and/or don’t know enough about how new/novel/obvious are defined in this area. Thanks.
Editing to add this Shaw quote. It doesn’t mean that all unreasonable thoughts result in progress, but that you might have to be somewhat unreasonable change the world.
The reasonable man adapts himself to the world: the unreasonable one persists in trying to adapt the world to himself. Therefore all progress depends on the unreasonable man.
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