Smith started selling burgers and root beer in Shawnee in 1953 at a drive-in restaurant called Top Hat. There he perfected many of the methods that remain in place at Sonic's more than 3,500 drive-ins. Smith controlled traffic with angled parking, used car hops to deliver food and drink and instituted an innovative intercom system for taking orders.
He also created a network of partnerships to successfully grow the chain through a profit-sharing program.
Smith was a generous benefactor, giving millions to causes in Shawnee, his adopted hometown of Edmond, and elsewhere.
Sonic, based in Oklahoma City, is a $600 million publicly traded company. The company recently celebrated the 50th anniversary of the chain's name change from Top Hat to Sonic with the publication of a book, "Sonic: The History of America's Drive-in." The book is dedicated to Smith.
Services will be 2 p.m. Friday at First Christian Church in Edmond under the direction of Matthews Funeral Home.
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