[Answer] Already known for its slogan "Service with the Speed of Sound," what did the burger chain Top Hat change its name to in 1959?

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Already known for its slogan "Service with the Speed of Sound," what did the burger chain Top Hat change its name to in 1959?

• Sonic Drive-In:In 1953, Troy N. Smith converted the Top Hat, an abandoned root beer stand, to serve hamburgers and hot dogs cooked to order. Upon learning that the Top Hat name was already trademarked, Smith changed the name to Sonic Drive-In in 1959. The new name worked with their existing slogan, "Service with the Speed of Sound." Sonic revolutionized the ordering process by using curbside speakers to allow customers to place their orders without ever leaving their cars. Customers would park their cars under a canopy, place their order, and have their food delivered by a carhop — on roller skates, no less.

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