WO9919249-A1 -- EP262947-A   JOHNSON MATTHEY PLC (JOHO)   JENKINS J W;  EP656317-A1   SHELL INT RES MIJ BV (SHEL)   JACOBS L L G,  LEDNOR P W,  LIMAHELU A G G,  SCHOONEBEEK R J,  VONKEMAN K A;  EP262947-B1   JOHNSON MATTHEY PLC (JOHO)   JENKINS J W;  JP58091002-A   ;  US4087259-A   TOYOTA CHUO KENKYUSHO KK (TOYW);  US4115074-A   TOYO ENG CORP (TOXS);  MITSUI TOATSU CHEM INC (MITK);  WO1996000186-A1   ;  AU737880-B -- EP656317-A1   SHELL INT RES MIJ BV (SHEL)   JACOBS L L G,  LEDNOR P W,  LIMAHELU A G G,  SCHOONEBEEK R J,  VONKEMAN K A;  EP262947-B1   JOHNSON MATTHEY PLC (JOHO)   JENKINS J W;  US4087259-A   TOYOTA CHUO KENKYUSHO KK (TOYW);  EP1025039-B1 -- EP262947-A   JOHNSON MATTHEY PLC (JOHO)   JENKINS J W;  EP656317-A1   SHELL INT RES MIJ BV (SHEL)   JACOBS L L G,  LEDNOR P W,  LIMAHELU A G G,  SCHOONEBEEK R J,  VONKEMAN K A;  JP58091002-A   ;  US4087259-A   TOYOTA CHUO KENKYUSHO KK (TOYW);  US4115074-A   TOYO ENG CORP (TOXS);  MITSUI TOATSU CHEM INC (MITK);  WO1996000186-A1   ;  US6673270-B1 -- US4844837-A   ENGELHARD MINERALS CORP (ENGH);  US5338488-A   COUNCIL SCI RES (COUN-Non-standard)   PRABHAKAR B,  MAMMAN A S,  SANSARE S D,  CHOUDHARY V R,  RAJPUT A M;  US5628931-A   SHELL CANADA LTD (SHEL)   LEDNOR P W,  SENDEN M M G,  VAN DER ZWET G P;  US5741440-A   EASTMAN CHEM CO (EACH)   COOPER J L,  INGRAM E M;  US5929286-A   UNIV CHICAGO (UYCG)   KRUMPELT M,  AHMED S,  KUMAR R,  DOSHI R;  EP303438-A   DAVY MCKEE CORP (POGC)   DUNSTER M,  KORCHNAK J D;  EP656317-A1   SHELL INT RES MIJ BV (SHEL)   JACOBS L L G,  LEDNOR P W,  LIMAHELU A G G,  SCHOONEBEEK R J,  VONKEMAN K A;  EP262947-B1   JOHNSON MATTHEY PLC (JOHO)   JENKINS J W;  US4087259-A   TOYOTA CHUO KENKYUSHO KK (TOYW);  US4115074-A   TOYO ENG CORP (TOXS);  MITSUI TOATSU CHEM INC (MITK);  US4897253-A   JOHNSON MATTHEY PLC (JOHO)   JENKINS J W;  US5149464-A   GAS RES INST (GASR-Non-standard)   GREEN M L H;  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;  US5762658-A   JOHNSON MATTHEY PLC (JOHO)   EDWARDS N,  FROST J C,  JONES A,  PIGNON J F;  WO1992011199-A1   ;  JP4261768-B2 -- JP07048101-A   ;  JP07196301-A   ;  JP07284666-A   ;  JP08002902-A   ;  JP08176557-A   ;  JP51035691-A   TOYOTA CHUO KENKYUSHO KK (TOYW);  JP52078601-A   ;  JP58091002-A   ;  JP63147802-A   JOHNSON MATTHEY PLC (JOHO)   JENKINS J W;  JP10502047-W   JOHNSON MATTHEY PLC (JOHO)   EDWARDS N,  FROST J C,  JONES A,  PIGNON J F;  WO1995032148-A1