What groundbreaking invention did Goodyear patent today?

Unknown-3June 15, 1844 — The Goodyear company patented the vulcanization of rubber. Charles Goodyear obtained his first patent to produce rubber on June 17, 1837.

However vulcanization makes the material much more durable. This discovery changed the industrial world.

Vulcanized rubber is malleable, durable and non-stick — and therefore it proved to be a very effective material for sealing small gaps.