US2003208960-A1 -- US4522894-A   ENGELHARD MINERALS CORP (ENGH)   HWANG H S,  HECK R M,  YARRINGTON R M;  US4844837-A   ENGELHARD MINERALS CORP (ENGH);  US4927857-A   ENGELHARD MINERALS CORP (ENGH);  US5023276-A   ENGELHARD MINERALS CORP (ENGH);  US5106590-A   DAVY MCKEE LONDON LTD (POGC)   HOPPER A,  HILL G,  DUNSTER M;  US5486313-A   SHELL INT RES MIJ BV (SHEL);  SHELL CANADA LTD (SHEL)   DE JONG K P,  SCHOONEBEEK R J,  VONKEMAN K A,  LEDNOR P W,  OUD A E M,  VAN DER ZWET G P;  US5510056-A   SHELL INT RES MIJ BV (SHEL)   JACOBS L L G,  LEDNOR P W,  LIMAHELU A G G,  SCHOONEBEEK R J,  VONKEMAN K A;  US5639401-A   SHELL INT RES MIJ BV (SHEL);  SHELL CANADA LTD (SHEL)   JACOBS L L G,  LEDNOR P W,  VAN LOON P J M,  OOSTERVELD M,  VONKEMAN K A,  WENTINCK H M,  VAN DER ZWET G P,  LANGE J P;  US5648582-A   UNIV MINNESOTA (MINU)   HICKMAN D A,  SCHMIDT L D;  US5654491-A   UNIV MINNESOTA (MINU)   SCHMIDT L D,  GOETSCH D A;  US5658497-A   SHELL OIL CO (SHEL)   SCHOONEBEEK R J,  VAN DER ZWET G P,  SEARCY-ROBERTS K,  LEDNOR P W,  KUMAR K N P,  LANGE J;  US5669960-A   PRAXAIR TECHNOLOGY INC (PRAX)   COUCHE M R;  US5720901-A   SHELL INT RES MIJ BV (SHEL);  SHELL CANADA LTD (SHEL)   DE JONG K P,  SCHOONEBEEK R J,  VONKEMAN K A;  US5883138-A   EXXON RES & ENG CO (ESSO)   HERSHKOWITZ F,  DECKMAN H W,  REYNOLDS R P,  GONATAS C P,  FULTON J W,  SCHOENMAN L,  ITO J I,  CLAVENNA L R;  US5980857-A   BOC GROUP PLC (BRTO)   KAPOOR A,  CHEN Y,  DAVIES S P,  THOROGOOD R M,  KUMAR R;  US6092921-A   SHELL INT RES MIJ BV (SHEL)   WENTINCK H M,  VAN WOLFSWINKEL A;  EP1364911-A1 -- EP212889-A   IMPERIAL CHEM IND PLC (ICIL)   PINTO A;  FR2823192-A1   ;  US4927857-A   ENGELHARD MINERALS CORP (ENGH);  US5669960-A   PRAXAIR TECHNOLOGY INC (PRAX)   COUCHE M R;  US5980857-A   BOC GROUP PLC (BRTO)   KAPOOR A,  CHEN Y,  DAVIES S P,  THOROGOOD R M,  KUMAR R;  US6783749-B2 -- EP212889-A   IMPERIAL CHEM IND PLC (ICIL)   PINTO A;  EP303438-A   DAVY MCKEE CORP (POGC)   DUNSTER M,  KORCHNAK J D;  EP640559-A1   SNAMPROGETTI SPA (SNAM)   SANFILIPPO D,  BASINI L,  MARCHIONNA M;  EP640561-A1   SHELL INT RES MIJ BV (SHEL)   LEDNOR P W,  VONKEMAN K A;  EP842894-A1   HALDOR TOPSOE AS (TOPS)   PRIMDAHL I I;  FR2823192-A1   ;  US4522894-A   ENGELHARD MINERALS CORP (ENGH)   HWANG H S,  HECK R M,  YARRINGTON R M;  US4844837-A   ENGELHARD MINERALS CORP (ENGH);  US4927857-A   ENGELHARD MINERALS CORP (ENGH);  US5023276-A   ENGELHARD MINERALS CORP (ENGH);  US5106590-A   DAVY MCKEE LONDON LTD (POGC)   HOPPER A,  HILL G,  DUNSTER M;  US5486313-A   SHELL INT RES MIJ BV (SHEL);  SHELL CANADA LTD (SHEL)   DE JONG K P,  SCHOONEBEEK R J,  VONKEMAN K A,  LEDNOR P W,  OUD A E M,  VAN DER ZWET G P;  US5510056-A   SHELL INT RES MIJ BV (SHEL)   JACOBS L L G,  LEDNOR P W,  LIMAHELU A G G,  SCHOONEBEEK R J,  VONKEMAN K A;  US5639401-A   SHELL INT RES MIJ BV (SHEL);  SHELL CANADA LTD (SHEL)   JACOBS L L G,  LEDNOR P W,  VAN LOON P J M,  OOSTERVELD M,  VONKEMAN K A,  WENTINCK H M,  VAN DER ZWET G P,  LANGE J P;  US5648582-A   UNIV MINNESOTA (MINU)   HICKMAN D A,  SCHMIDT L D;  US5654491-A   UNIV MINNESOTA (MINU)   SCHMIDT L D,  GOETSCH D A;  US5658497-A   SHELL OIL CO (SHEL)   SCHOONEBEEK R J,  VAN DER ZWET G P,  SEARCY-ROBERTS K,  LEDNOR P W,  KUMAR K N P,  LANGE J;  US5669960-A   PRAXAIR TECHNOLOGY INC (PRAX)   COUCHE M R;  US5720901-A   SHELL INT RES MIJ BV (SHEL);  SHELL CANADA LTD (SHEL)   DE JONG K P,  SCHOONEBEEK R J,  VONKEMAN K A;  US5883138-A   EXXON RES & ENG CO (ESSO)   HERSHKOWITZ F,  DECKMAN H W,  REYNOLDS R P,  GONATAS C P,  FULTON J W,  SCHOENMAN L,  ITO J I,  CLAVENNA L R;  US5980857-A   BOC GROUP PLC (BRTO)   KAPOOR A,  CHEN Y,  DAVIES S P,  THOROGOOD R M,  KUMAR R;  US6092921-A   SHELL INT RES MIJ BV (SHEL)   WENTINCK H M,  VAN WOLFSWINKEL A;  WO1997037929-A1