1. Hogan, J. P. and Banks, R. L.U.S. Patent 2,825,721 to Phillips Petroleum Company, filed Aug.1954, Issued Mar. 1958.
2. Hogan, J. P. and Banks, R. L.Belgian Patent 530,617, filed Jan, 1955; filed in the U.S. Jan 1953 S.N. 333,576; also issued as Austrian Pat App. 864/54 filed Aug 6, 1954.
3. Ziegler, K.; Breil, H.; Martin, H.; Holzkamp, E.German Patent 973,626, Filed Nov 17, 1953, Issued April 14, 1960. See also U.S. Patent 3, 257,332, Filed Nov 15, 1954, Issued June 21, 1966.
4. Zletz, A.U.S. Patent 2,692,257 (filed April 28, 1951, issued Oct. 19, 1954) to Standard Oil (later Amoco) describes polymerizing ethylene using molybdenum oxide on alumina as a catalyst. However, management, perhaps influenced by consultants, did not understand the potential importance of the polymer.