US5484666-A -- US3278336-A   ;  US3615838-A   ;  US3814631-A   ALSTHOM SOC GEN CONSTR ELEC (ALST);  US4346150-A   EXXON RES & ENG CO (ESSO)   BELLOWS R J,  GRIMES P G,  NEWBY K R,  EINSTEIN H,  TSIEN E;  US4403018-A   ELECTROCHEM ENERGIECONVERSIE (ELEC-Non-standard)   ALFENAAR M,  LEIJEN J J P,  SCHLOESSER W J;  US4743518-A   INT FUEL CELLS CORP (ITFU)   ROMANOWSKI W E;  US4943495-A   MITSUBISHI DENKI KK (MITQ)   OKADA T,  MIYAZAKI M,  TANAKA T,  HATOU C,  MUKAI M;  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;  US5326650-A   NGK INSULATORS LTD (NIGA)   ISHIDA Y;  US5342706-A   INST GAS TECHNOLOGY (IGTE)   PETRI R J,  MARIANOWSKI L G;  US3134697-A   ;  US3297484-A   GENERAL ELECTRIC CO (GENE);  US3297490-A   AMERICAN CYANAMID CO (AMCY);  US4057479-A   BILLINGS ENERGY RES (BILL-Non-standard)   CAMPBELL B C;  US4214969-A   GENERAL ELECTRIC CO (GENE);  UNITED TECHNOLOGIES CORP (UNAC)   LAWRANCE R J;  US4478917-A   HITACHI LTD (HITA)   FUJITA K,  TAMURA K,  KAWANA H,  IWAMOTO K,  HORIBA T;  US5176966-A   BALLARD POWER SYSTEMS INC (BLRD)   EPP D G,  WIENS B I;  WO9609659-A1 -- EP242201-A   WESTINGHOUSE ELECTRIC CORP (WESE)   DRAPER R,  YOUNG W E,  SPURRIER F,  DILMORE J A;  EP329161-A   ISHIKAWAJIMA HARIMA JUKOGYO KK (ISHI)   ZAIMA N,  HIRATA T,  HOTTA M;  JP03119665-A   ;  JP63121267-A   ;  KR9401913-B1   ;  KR94001913-B1   ;  US5176966-A   BALLARD POWER SYSTEMS INC (BLRD)   EPP D G,  WIENS B I;  AU684230-B -- US4943495-A   MITSUBISHI DENKI KK (MITQ)   OKADA T,  MIYAZAKI M,  TANAKA T,  HATOU C,  MUKAI M;  US5176966-A   BALLARD POWER SYSTEMS INC (BLRD)   EPP D G,  WIENS B I;  EP783771-B1 -- EP242201-A   WESTINGHOUSE ELECTRIC CORP (WESE)   DRAPER R,  YOUNG W E,  SPURRIER F,  DILMORE J A;  EP329161-A   ISHIKAWAJIMA HARIMA JUKOGYO KK (ISHI)   ZAIMA N,  HIRATA T,  HOTTA M;  JP03119665-A   ;  JP63121267-A   ;  KR9401913-B1   ;  US5176966-A   BALLARD POWER SYSTEMS INC (BLRD)   EPP D G,  WIENS B I