US Patent 3, 383, 289: Int.Cl. 195-28 / R.L. Raymond, D. Wilmington, V.W. Jamison. Microbiological oxidation of alkylbenzenes. Prospect Park, Pa. assigners to Sun Oil Company, Philadelphia, Pa., a corporation of New Jersay. Filed: 24.11.65, Ser. No. 509, 621. 1965.