US2004074546-A1 -- US1472265-A   ;  US3019815-A   ;  US4512368-A   SUMITOMO METAL IND LTD (SUMQ)   KAMINAKA M,  TAKASHIMA H,  KABURAGI K;  US4536104-A   HOECHST AG (FARH)   BUNGERT T;  US5065794-A   UNION CARBIDE IND G (UNIC)   CHEUNG S D;  US5241867-A   BERTIN & CIE (BERU);  COHEN D (COHE-Individual)   LEGALL Y,  DAUSSET J,  MILLASSEA P,  LEGALL I;  US5325884-A   CONSERVAIR TECHNOLOGIES (CONS-Non-standard)   MIREL R J,  WILSON R E,  HUNT E C;  US5343841-A   NIPPONDENSO CO LTD (NPDE)   HATTORI I,  NOMURA Y,  KOHAMA T,  NOMURA S;  US5353828-A   ROBERTSHAW CONTROLS CO (RSHC)   TROSCINSKI D W;  US5474102-A   LOPEZ R (LOPE-Individual)   LOPEZ R;  US5664600-A   PALMER D W (PALM-Individual)   PALMER D W;  US5934327-A   GODDARD VALVE CORP (GODD-Non-standard)   NELSON D R,  RUSSELL R L;  US6532978-B1   ANALYTICON BIOTECHNOLOGIE PHARM AG (ANAL-Non-standard)   MUELLER-KUHRT L,  GOD R,  GUMM H,  BINKELE J;  US6878472-B2 -- US1472265-A   ;  US3019815-A   ;  US4512368-A   SUMITOMO METAL IND LTD (SUMQ)   KAMINAKA M,  TAKASHIMA H,  KABURAGI K;  US4536104-A   HOECHST AG (FARH)   BUNGERT T;  US4729930-A   INT FUEL CELLS CORP (ITFU)   BEAL D W,  SCHEFFLER G W;  US5065794-A   UNION CARBIDE IND G (UNIC)   CHEUNG S D;  US5241867-A   BERTIN & CIE (BERU);  COHEN D (COHE-Individual)   LEGALL Y,  DAUSSET J,  MILLASSEA P,  LEGALL I;  US5325884-A   CONSERVAIR TECHNOLOGIES (CONS-Non-standard)   MIREL R J,  WILSON R E,  HUNT E C;  US5343841-A   NIPPONDENSO CO LTD (NPDE)   HATTORI I,  NOMURA Y,  KOHAMA T,  NOMURA S;  US5353828-A   ROBERTSHAW CONTROLS CO (RSHC)   TROSCINSKI D W;  US5474102-A   LOPEZ R (LOPE-Individual)   LOPEZ R;  US5571630-A   CHEIKY M C (CHEI-Individual)   CHEIKY M C;  US5658681-A   AISIN AW CO LTD (AISW);  EQUOS RES KK (EQUS)   SATO M,  SHIRAISHI K;  US5664600-A   PALMER D W (PALM-Individual)   PALMER D W;  US5934327-A   GODDARD VALVE CORP (GODD-Non-standard)   NELSON D R,  RUSSELL R L;  US5991670-A   DBB FUEL CELL ENGINES GMBH (DBBF-Non-standard)   STRASKY D G,  MUFFORD W E;  US6048634-A   H-POWER CORP (HPOW-Non-standard)   KAUFMAN A,  TERRY P L;  US6103409-A   GENERAL MOTORS CORP (GENK)   BOSCO A D,  FRONK M H;  US6218038-B1   PLUG POWER INC (PLUG-Non-standard)   OKO U M,  ZIELINSKI W J;  US6532978-B1   ANALYTICON BIOTECHNOLOGIE PHARM AG (ANAL-Non-standard)   MUELLER-KUHRT L,  GOD R,  GUMM H,  BINKELE J