GB2341561 A: Hydrogen Purifier (22-03-2000), G. Hoogers

EP1155465: Electrode Structure (21-11-2001), S.J. Cooper, G. Hoogers

EP1192681: Gas Diffusion Substrate And Electrode (03-04-2002), S.C. Ball, S.J. Cooper, G.A. Hards, G. Hoogers, D. Thompsett