1. P.K. Ladwig, J.E. Asplin, G.F. Stuntz, W.A. Wachter, B.E. Henry, US Patent 6069287 (2000), to Exxon Research and Engineering Corporation.
2. J.P. Dath, W. Vermeiren, K. Herrenbout, WO 00/78894 (2000), to Fina Oil and Chemical Corporation.
3. L.D. Johnson, E.K. Nariman, A.R. Ware, US Patent 6222087 (2001), to Mobil Oil Corporation.
4. T.R. Steffens, P.K. Ladwig, US Patent 6455750 (2002), to Exxonmobil Chemical Patents Incorporation.