of Deringer's workmen also left the company to set up their own duplicates, whilst others copied his pistols as closely as possible with some even putting on its Deringer name and trademark. Deringer fought these infringements for most of his business life. The Deringer v. Plate ruling, in which the California Supreme Court ruled in the company's favor, became a landmark in trademark law. Death Deringer died in 1868 at the age of 81 and was buried in Laurel Hill Cemetery in Philadelphia. See also Concealed carry in the United States References External links "The Booth Deringer—Genuine Artifact or Replica?" at FBI.gov Bond Arms - Modern manufacturer of derringers American Derringer - Modern manufacturer of derringers 1786 births 1868 deaths 19th-century American businesspeople 19th-century American inventors Burials at Laurel Hill Cemetery (Philadelphia) Businesspeople from Philadelphia Derringers Firearm designers Gunsmiths People from Easton, Pennsylvania Weapon designers