Over the last half century, fast food has become a nearly $300 billion dollar staple for Americans on the go. And it was a series of entrepreneurs who created some of the biggest innovations not just in fast food, but in the entire history of food. Hope you’re hungry! From the invention of the hamburger patty by the eventual founder of White Castle, to the McDonald’s Speedee system that has been replicated by countless fast-food chains, to the 30 minutes or less guarantee that started a delivery revolution… these are the groundbreaking ideas that make up fast food’s greatest innovations.