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Transcript of The Invention of the Stop Sign. The Stop Sign Progress/Changes Made on the Stop Sign 1915 1925 1935 1945 1955 1965 1975 1915- A man named William Phelps Eno invented a white sign with black letters, in Detroit, Michigan. 1922- Realizing the stop sign was so important, an association was formed to make more stop signs.
He patented his invention in 1915 and during his quest to find a use for it he discovered that by bending the tubes, he could make letters that glowed. The use of neon tubes for advertising signs began in 1923, when his company Claude Neon, introduced the gas filled tubular signs to the United States. He sold two to a Packard car dealership in Los Angeles. The first neon signs were dubbed 'liquid fire' and people would stop in the street to stare at them, even in daylight, they glow visibly.