On October 3, 1967, U.S. Patent No. D208849 issued to James D. Smth and Rober C. Flint on a Sign:

The sign in question was the Flint’s Hamburger sign, a hamburger chain with multiple locations in Ohio, and at least one North Carolina location, although none of the locations have survived..

The sign was topped with a neon-lot Roto-sphere, an icon of the 1960’s, although it was not part of the design as it is shown in dashed lines. Only about 200 Roto-spheres were made, and unlike FIlnt’s, at least a few survive: