Almost all the labels had their own alleged, patented audio process, but many of them were pure fantasy (Riverside's Judson blurb certainly was), in the tradition of Paramount's "electrically recorded" claims, which aural evidence indicated meant nothing more than that there was an electric bulb lighting the studio.
That said, I used to frequent a wonderful opera-oriented restaurant in Philly and vaguely recall seeing on the walls old Victor posters from the 78 rpm period claiming "high fidelity". I looked for something like that online, but in vain.