EP987054-A1 -- EP764466-A2   MATSUSHITA ELECTRIC IND CO LTD (MATU)   YASUMOTO E,  HATOH K,  GAMOU T;  US4994247-A   PHILLIPS PETROLEUM CO (PHIP)   TOOLEY P A,  KOLS J H;  US5238670-A   AIR LIQUIDE CANADA LTEE (AIRL)   LOUISE J,  MOLLARET B,  THONNELIER J Y;  US6162558-A -- EP764466-A2   MATSUSHITA ELECTRIC IND CO LTD (MATU)   YASUMOTO E,  HATOH K,  GAMOU T;  JP07256112-A   ;  JP10101303-A   TOYOTA JIDOSHA KK (TOYT)   KAWATSU S,  TAKI M;  JP10261425-A   ;  US3939062-A   ;  US4172817-A   ;  US4303552-A   GRACE & CO W R (GRAC)   ERNEST M V,  WELSH W A;  US4377495-A   ;  US4417083-A   STE ELF-FRANCE (ERAP)   BREYSSE M,  BERNARD J R;  US4447551-A   EXXON RES & ENG CO (ESSO)   FUNG S C,  RICE S W,  WEISSMAN W,  CARTER J L,  KMAK W S;  US4514284-A   ;  US4517076-A   ;  US4518708-A   ;  US4537839-A   JOHNSON MATTHEY PLC (JOHO)   CAMERON D;  US4994247-A   PHILLIPS PETROLEUM CO (PHIP)   TOOLEY P A,  KOLS J H;  US5009872-A   ATOMIC ENERGY OF CANADA LTD (ATOC);  CHUANG K T (CHUA-Individual)   CHUANG K T,  MCMONAGLE J B,  QUAIATTINI R J,  SEDDON W A,  CLEGG D E;  US5017357-A   PHILLIPS PETROLEUM CO (PHIP)   KOLTS J H,  TOOLEY P A,  BROWN S H;  US5114901-A   ;  US5200375-A   MOBIL OIL CORP (MOBI)   DESSAU R M;  US5202299-A   GENERAL MOTORS CORP (GENK)   SYMONS W T,  BECKMEYER R F;  US5238670-A   AIR LIQUIDE CANADA LTEE (AIRL)   LOUISE J,  MOLLARET B,  THONNELIER J Y;  US5248566-A   US DEPT ENERGY (USAT)   KUMAR R,  AHMED S,  KRUMPELT M,  MYLES K M;  US5271916-A   GENERAL MOTORS CORP (GENK)   GUANTE J,  VANDERBORGH N E,  NGUYEN T V;  US5316871-A   GENERAL MOTORS CORP (GENK)   SWATHIRAJAN S,  MIKHAIL Y M;  US5482680-A   BALLARD POWER SYSTEMS INC (BLRD)   WILKINSON D P,  VOSS H H,  DUDLEY J,  LAMONT G J,  BASURA V;  US5518705-A   BALLARD POWER SYSTEMS INC (BLRD)   MCNEILLY L,  WATKINS D S,  BUSWELL R F,  COHEN R;  US5612012-A   NGK INSULATORS LTD (NIGA)   SOMA T,  TAKAHASHI T,  ISOMURA M;  US5637415-A   GENERAL MOTORS CORP (GENK)   MELTSER M A,  HOCH M M;  US5702838-A   MATSUSHITA ELECTRIC IND CO LTD (MATU)   YASUMOTO E,  HATOH K,  GAMOU T;  JP3197881-B2 -- JP07256112-A   ;  JP09320624-A   ;  JP10101303-A   TOYOTA JIDOSHA KK (TOYT)   KAWATSU S,  TAKI M;  JP10261425-A   ;  EP987054-B1 -- EP764466-A2   MATSUSHITA ELECTRIC IND CO LTD (MATU)   YASUMOTO E,  HATOH K,  GAMOU T;  US4994247-A   PHILLIPS PETROLEUM CO (PHIP)   TOOLEY P A,  KOLS J H;  US5238670-A   AIR LIQUIDE CANADA LTEE (AIRL)   LOUISE J,  MOLLARET B,  THONNELIER J Y