Frustoconical – the Right Word for the Right Shape

Another unusual pair of words that are common only in a patent attorney’s lexicon are frustoconical and frustopyramidal, meaning¬† truncated cone and truncated pyramid, respectively.¬† Frustoconical appears in the claims fo 8432 patents since 1976, frustopyramidal in only 80 patents since 1976.

If you need to describe the shape of a truncated cone, frustoconical is exactly what you need to use.¬† Even though the work is obscure, it is doubtful that it is any harder for a lay person to understand than “truncated cone” than frustoconical.

U.S. Patent No. 8,534,460, Fig. 2 showing a “tapering frustoconical sidewall 32”