Stillwater company wins trademark battle over nail-driving game Hammer-Schlagen A Stillwater firm retains its 2000 trademark rights over Hammer-Schlagen. March 14, 2021 — 2:23pm Text size Copy shortlink: A Stillwater company with a 21-year-old trademark for the popular drinking game Hammer-Schlagen has won a trademark infringement battle with a Chaska brewery. U.S. District Chief Judge John Tunheim ruled in early March that WRB Inc.'s trademark remains valid and enforceable. The trademark was established in 2000, according to th...