;  JP3768991-B2 -- JP2003175340-A   KOREA ADV INST SCI & TECHNOLOGY (KOAD)   WON J;  JP2000516014-W   DU PONT DE NEMOURS & CO E I (DUPO)   GROT W G,  RAJENDRAN G;  JP2004502008-W   UNIV STUTTGART INST CHEM VERFAHRENSTECH (UYST-Non-standard)   KERRES J,  ZHANG W,  TANG C;  US7357999-B2 -- US5795496-A   CALIFORNIA INST OF TECHNOLOGY (CALY)   YEN S S,  NARAYANAN S R,  HALPERT G,  GRAHAM E,  YAVROUIAN A;  US5919583-A   DU PONT DE NEMOURS & CO E I (DUPO)   GROT W G,  RAJENDRAN G;  US20050244697-A1   ;  US6410142-B1   ZH KOGYO GIJUTSU KENKYUHIN (ITRI)   CHIN E,  KAKU B,  SAI K,  GO S;  US6555610-B1   ;  US6630265-B1   HOKU SCI INC (HOKU-Non-standard)   TAFT K M,  KURANO M R;  CN1357565-A   ;  JP2002216777-A   HONDA GIKEN KOGYO KK (HOND)   FUKUDA K,  ASANO Y,  KANAOKA N,  SAITO N,  NANAUMI M;  JP2003175340-A   KOREA ADV INST SCI & TECHNOLOGY (KOAD)   WON J;  JP2000516014-W   DU PONT DE NEMOURS & CO E I (DUPO)   GROT W G,  RAJENDRAN G;  JP2004502008-W   UNIV STUTTGART INST CHEM VERFAHRENSTECH (UYST-Non-standard)   KERRES J,  ZHANG W,  TANG C;  KR2002077673-A   UNIV RAMOT APPLIED RES & IND DEV LTD (UYTA)   PELED E,  DUVDEVANI T,  MELMAN A,  AHARON A;  US3282875-A   DU PONT DE NEMOURS & CO E I (DUPO);  US4358545-A   DOW CHEM CO (DOWC)   EZZELL B R,  CARL W P,  MOD W A;  US4940525-A   DOW CHEM CO (DOWC)   EZZELL B R,  CARL W P;  US4985315-A   MTU FRIEDRICHSHAFEN AG (MOTU)   LEMOINE J;  US5409785-A   EQUOS RES KK (EQUS)   NAKANO N,  AZUMA R,  NAKASHIMA M,  HORIGUCHI M;  US5422411-A   BALLARD POWER SYSTEMS INC (BLRD)   WEI J,  STONE C,  STECK A E;  US5672439-A   BALLARD POWER SYSTEMS INC (BLRD)   WILKINSON D P,  JOHNSON M C,  COLBOW K M,  CAMPBELL S A;  US5795668-A   DU PONT DE NEMOURS & CO E I (DUPO)   BANERJEE S;  US5849428-A   US SEC OF ARMY (USSA)   HAMLEN R P;  US5981097-A   DU PONT DE NEMOURS & CO E I (DUPO)   RAJENDRAN G;  US6054230-A   JAPAN GORE TEX INC (NIGO)   KATO H;  US6130175-A   GORE ENTERPRISE HOLDINGS INC (GORE)   KOLDE J A,  RUSCH G;  US6194474-B1   UNIV STUTTGART LEHRSTUHL & INST CHEM VER (UYST-Non-standard)   KERRES J,  CUI W;  US6242122-B1   FORSCHUNGSZENTRUM JUELICH GMBH (KERJ)   DOHLE H,  PEINECKE V,  BUSENBENDER I,  KELS T;  US6510047-B2   NGK INSULATORS LTD (NIGA)   TAKEUCHI Y,  NANATAKI T,  KIMURA K;  WO1996029752-A1   ;  WO2001054216-A2   ;  WO2002000773-A2