EP1254712-A1 -- DE3643332-A   NIPPON ENGELHARD KK (ENGH)   ITO T,  MATSUZAWA S,  KATO K;  EP355853-A   NE CHEMCAT CORP (NECH-Non-standard)   ITOH T,  KATO K;  EP386764-A   NE CHEMCAT CORP (NECH-Non-standard)   ITOH T,  KATOH K;  EP694982-A1   DEGUSSA AG (DEGS)   BRAND R,  FREUND A,  LANG J,  LEHMANN T,  OHMER J,  TACKE T,  HEINZ G,  SCHWARZ R;  EP994520-A1   DEGUSSA-HUELS AG (DEGS)   AUER E,  GERHARD H,  LEHMANN T,  SCHWARZ R,  STARZ K;  EP880188-A2   DEGUSSA AG (DEGS)   AUER E,  FREUND A,  LEHMANN T,  STARZ K,  SCHWARZ R,  STENKE U;  EP1046423-A2   DEGUSSA-HUELS AG (DEGS)   MUSSMANN L,  LINDNER D,  HARRIS M,  KREUZER T,  LOX E;  US4137373-A   UNITED TECHNOLOGIES CORP (UNAC)   JALAN V M,  BUSHNELL C L;  US4145314-A   EXXON RES & ENG CO (ESSO)   FUNG S C,  PAN Y C;  US5132193-A   PHYSICAL SCI INC (PHYS-Non-standard)   REDDY V N R,  TAYLOR E J;  US5133842-A   PHYSICAL SCIENCES I (PHYS-Non-standard)   TAYLOR E J,  MONIZ G A;  US5861222-A   DEGUSSA AG (DEGS)   FISCHER A,  WENDT H,  ZUBER R;  EP1254712-B1 -- DE3643332-A   NIPPON ENGELHARD KK (ENGH)   ITO T,  MATSUZAWA S,  KATO K;  EP355853-A   NE CHEMCAT CORP (NECH-Non-standard)   ITOH T,  KATO K;  EP386764-A   NE CHEMCAT CORP (NECH-Non-standard)   ITOH T,  KATOH K;  EP694982-A1   DEGUSSA AG (DEGS)   BRAND R,  FREUND A,  LANG J,  LEHMANN T,  OHMER J,  TACKE T,  HEINZ G,  SCHWARZ R;  EP994520-A1   DEGUSSA-HUELS AG (DEGS)   AUER E,  GERHARD H,  LEHMANN T,  SCHWARZ R,  STARZ K;  EP880188-A2   DEGUSSA AG (DEGS)   AUER E,  FREUND A,  LEHMANN T,  STARZ K,  SCHWARZ R,  STENKE U;  EP1046423-A2   DEGUSSA-HUELS AG (DEGS)   MUSSMANN L,  LINDNER D,  HARRIS M,  KREUZER T,  LOX E;  US4137373-A   UNITED TECHNOLOGIES CORP (UNAC)   JALAN V M,  BUSHNELL C L;  US4145314-A   EXXON RES & ENG CO (ESSO)   FUNG S C,  PAN Y C;  US5132193-A   PHYSICAL SCI INC (PHYS-Non-standard)   REDDY V N R,  TAYLOR E J;  US5133842-A   PHYSICAL SCIENCES I (PHYS-Non-standard)   TAYLOR E J,  MONIZ G A;  US5861222-A   DEGUSSA AG (DEGS)   FISCHER A,  WENDT H,  ZUBER R