The flagship product was invented in 1957 by Morris D. Rouff which manufactured industrial cleaning supplies. The inventor's family claim that it was named for the birthday of the inventor's wife, Ruth, on April the 9th . The company eventually took Formula 409 to a 55 percent share of the spray-cleaner market, and six years later, Harrell, Woodcock & Linkletter sold the company to Clorox for $7 million..