On September 26, 1933, U.S. Patent No. D90793½ issued to C.T. Coxner:

The patent is notable because of its number “90793 ½.” This is one of the rare fractional patents. The USPTO would ocassionally lose track and in order to keep the patents in the correct order would have to give a patent a fractional number. We have written about fractional patents before here: https://patents.harnessip.com/?p=2261, but today’s fractional patent is even more special because it is a fractional design patent.

Other fractional patents include 126½, RE1,217½, RE1,242½, 2,712,152½, 3,262,124½, 1400½, and one other fractional design patent: D1093½