At first, Claude did not think about a neon lamp. He wanted to extract pure oxygen to sell it to hospitals and welders. But the oxygen kept coming with a retinue of inert gases. Driving the unwelcome guests into tubes under low pressure, he discovered that the tubes were glowing: those with neon were glowing red, while tubes with argon generated blue light. That was when the entrepreneur's head came aflame. And the streets in cities and towns lit up.
On November 9, 1911, the Parisian inventor Georges Claude patented neon advertising