I’m not a trademark lawyer, but I used to work with them in the UK. From what I recall, trademarks need to described in language accessible to ‘everyman’ to be

I’m not a trademark lawyer, but I used to work with them in the UK. From what I recall, trademarks need to described in language accessible to ‘everyman’ to be protectable. So when I was there, about 5 years ago, I don’t recall that there had been a successful bid to trademark a smell because a gas chromatograph didn’t fit the bill.