WO9934466-A1 -- DE19509748-A1   DEUT FORSCH LUFT RAUMFAHRT EV (DELF)   BEVERS D;  DE19509749-A1   DEUT FORSCH LUFT RAUMFAHRT EV (DELF)   BEVERS D,  WAGNER N;  EP736921-A1   JOHNSON MATTHEY PLC (JOHO);  BALLARD POWER SYSTEMS INC (BLRD)   WILKINSON D P,  VOSS H H,  PRATER K B,  HARDS G A,  RALPH T R,  THOMPSETT D;  US5290642-A   ALLIED-SIGNAL INC (ALLC)   MINH N O,  HORNE C R;  US5536278-A   HYDRO QUEBEC (QUGO)   ST-AMANT G,  DUVAL M;  WO1997023919-A1   ;  WO1997047052-A1   ;  WO1997023916-A2   ;  US6291091-B1 -- DE19509749-A1   DEUT FORSCH LUFT RAUMFAHRT EV (DELF)   BEVERS D,  WAGNER N;  DE19509748-C2   DEUT FORSCH LUFT RAUMFAHRT EV (DELF)   BEVERS D;  EP718903-A1   JAPAN GORE TEX INC (NIGO)   KATO H;  EP736921-A1   JOHNSON MATTHEY PLC (JOHO);  BALLARD POWER SYSTEMS INC (BLRD)   WILKINSON D P,  VOSS H H,  PRATER K B,  HARDS G A,  RALPH T R,  THOMPSETT D;  US4157432-A   EXXON RES & ENG CO (ESSO)   LUNDBERG R D,  MAKOWSKI H S,  BOCK J;  US4437952-A   DU PONT DE NEMOURS & CO E I (DUPO)   SMITH R A,  WITHERS M S;  US4645602-A   AMF INC (AMMA);  CUNIO INC (CUNI-Non-standard);  BARNES R G (BARN-Individual);  CUNO INC (CUNO)   BARNES R G,  MEYERING M T;  US4954388-A   GORE & ASSOC INC W L (GORE);  DUPONT DENEMOUS (DUPO);  DU PONT DE NEMOURS & CO E I (DUPO);  MALLOUK R S (MALL-Individual)   MALLOUK R S,  BRANCA P A,  PERRY R L;  US5290642-A   ALLIED-SIGNAL INC (ALLC)   MINH N O,  HORNE C R;  US5447636-A   DU PONT DE NEMOURS & CO E I (DUPO)   BANERJEE S;  US5536278-A   HYDRO QUEBEC (QUGO)   ST-AMANT G,  DUVAL M;  US5599614-A   GORE & ASSOC INC W L (GORE)   BAHAR B,  HOBSON A R,  KOLDE J A;  US5744015-A   STANDARD OIL CO OHIO (STAH)   CABLE T L,  FRYE J G,  KLIEWER W R,  MAZANEC T J;  WO1997023919-A1   ;  WO1997047052-A1   ;  WO1997023916-A2   ;  EP1042837-B1 -- DE19509748-A1   DEUT FORSCH LUFT RAUMFAHRT EV (DELF)   BEVERS D;  DE19509749-A1   DEUT FORSCH LUFT RAUMFAHRT EV (DELF)   BEVERS D,  WAGNER N;  EP736921-A1   JOHNSON MATTHEY PLC (JOHO);  BALLARD POWER SYSTEMS INC (BLRD)   WILKINSON D P,  VOSS H H,  PRATER K B,  HARDS G A,  RALPH T R,  THOMPSETT D;  US5290642-A   ALLIED-SIGNAL INC (ALLC)   MINH N O,  HORNE C R;  US5536278-A   HYDRO QUEBEC (QUGO)   ST-AMANT G,  DUVAL M;  WO1997023919-A1   ;  WO1997047052-A1   ;  WO1997023916-A2