Public Use
Patent
Utilization of a completed invention in a nonexperimental manner in public, i.e., under conditions permitting a party who is not under an obligation of secrecy to observe the invention. MPEP 2133.03, MPEP 2133.03(a).
A public or commercial use of an invention. If the public use occurred more than one year before the filing date of the patent application, obtaining a U.S. patent would be barred. If a use is experimental, then it is not a public use. Sometimes experimental use is referred to an exception to the public-use bar.