Raymond Loewy is well-known as an industrial designer but he was also responsible for some of the world's most iconic logos. Pictured below are several sketches that Loewy did for the new Exxon logo:

Big business moved more slowly back then; the sketches were done by Loewy in 1966 but the name change and new logo didn't go into effect until 1972. Loewy was also responsible for several other logos: Shell, Hoover, BP, Nabisco, Canada Dry, and U.S. Mail.