On September 26, 1967, U.S. Patent Nos. D208754 and D208755 issued to John O. Hruby each on a Water Fountain:

What is unique about these patents is that they are directed to the flowing water, and not any permanent physical structure. Unfortunately for Mr. Hruby, he had to go to the CCPA get his patents. See, Application of John O. Hruby, Jr, 373 F.2d 997 (C.C.P.A. 1967).