WO200154218-A2 -- DE19629084-A1   SIEMENS AG (SIEI)   GRUENE H,  BUCHNER P,  HELMOLT R;  EP343679-A   INT FUEL CELLS CORP (ITFU)   REISER C A;  EP629015-A1   DE NORA PERMELEC SPA (ORON)   FAITA G,  MANTEGAZZA C;  EP784352-A1   NISSHINBO IND INC (NISN)   SAITO K,  HAGIWARA A,  TANNO F;  EP788172-A1   MATSUSHITA ELECTRIC IND CO LTD (MATU)   UCHIDA M,  FUKUOKA Y,  SUGAWARA Y,  EDA N;  EP977291-A1   VARTA AG (VART)   BAEUERLEIN P,  NEUMANN S;  EP1030396-A1   TOSHIBA KK (TOKE)   CHIZAWA H,  OGAMI Y,  SAITO K,  UENO M;  GB2336712-A   BG PLC (GASC)   DONG Z;  JP01186768-A   ;  JP10162842-A   ;  JP56093265-A   SANYO ELECTRIC CO (SAOL);  JP59154770-A   ;  JP63086270-A   HITACHI LTD (HITA)   TADA N,  ITO M,  KAWADA Y;  JP63270138-A   ;  US3134696-A   ;  US3436272-A   ;  US3589942-A   CONSOLIDATED NATURAL GAS (CON-Non-standard);  US5252410-A   BALLARD POWER SYSTEMS INC (BLRD)   WILKINSON D P,  VOSS H H,  PRATER K B;  US5300370-A   BALLARD POWER SYSTEMS INC (BLRD)   VOSS H H,  WILKINSON D P,  WASHINGTON K B;  US5846459-A   UCAR CARBON TECHNOLOGY CORP (UNIC)   MERCURI R A;  EP1249051-B1 -- DE19629084-A1   SIEMENS AG (SIEI)   GRUENE H,  BUCHNER P,  HELMOLT R;  EP343679-A   INT FUEL CELLS CORP (ITFU)   REISER C A;  EP629015-A1   DE NORA PERMELEC SPA (ORON)   FAITA G,  MANTEGAZZA C;  EP784352-A1   NISSHINBO IND INC (NISN)   SAITO K,  HAGIWARA A,  TANNO F;  EP788172-A1   MATSUSHITA ELECTRIC IND CO LTD (MATU)   UCHIDA M,  FUKUOKA Y,  SUGAWARA Y,  EDA N;  EP977291-A1   VARTA AG (VART)   BAEUERLEIN P,  NEUMANN S;  EP1030396-A1   TOSHIBA KK (TOKE)   CHIZAWA H,  OGAMI Y,  SAITO K,  UENO M;  GB2336712-A   BG PLC (GASC)   DONG Z;  JP01186768-A   ;  JP10162842-A   ;  JP56093265-A   SANYO ELECTRIC CO (SAOL);  JP59154770-A   ;  JP63086270-A   HITACHI LTD (HITA)   TADA N,  ITO M,  KAWADA Y;  JP63270138-A   ;  US3589942-A   CONSOLIDATED NATURAL GAS (CON-Non-standard);  US5252410-A   BALLARD POWER SYSTEMS INC (BLRD)   WILKINSON D P,  VOSS H H,  PRATER K B;  US5300370-A   BALLARD POWER SYSTEMS INC (BLRD)   VOSS H H,  WILKINSON D P,  WASHINGTON K B;  US5846459-A   UCAR CARBON TECHNOLOGY CORP (UNIC)   MERCURI R A;  US6808834-B2 -- JP01186768-A   ;  JP10162842-A   ;  WO2001054218-A2   ;  WO154218-A3