Preparation and Properties of Open Pore Polyurethane (OPP)

U.S. Patent 3,574,160, "Open-Pore Polyurethane Product", Robert T. Jefferson, Ival O. Salyer, issued April 6, 1971.

U.S. Paten 3,580,843, "Chromategraphic Medium and Method", Ival O. Salyer, Robert T. Jefferson, and William D Ross, issued May 28, 1971.

Salyer, I.O. , Schwendeman, J.L. , and Jefferson , R.L. , "Polymethane Precipitation Foam", presented at the 156th meeting of the American Chemical Society Atlantic City, N.J., September 8-14, 1968.

Ross, W.E. , and Jefferson, R.T. "In Situ Formed Open Pore Polyurethane as Chromatography Supports", J Chromatographic Science, Vol 5 ( 1970), p 386-389.

Bowen, H.J.M. , "Absorption by Polymethane Foams. New Method of Separation". J Chem Soc A 1970, p. 1082-85.