WO200227847-A2 -- DE19821767-A1   SIEMENS AG (SIEI)   WAIDHAS M,  HELMOLT R V,  BUCHNER P,  NOELSCHER C;  US5523175-A   INT FUEL CELLS INC (ITFU)   BEAL D,  MARTIN R G,  GORMAN M E;  US6117287-A   PROTON ENERGY SYSTEMS (PROT-Non-standard)   MOLTER T M,  MOULTHROP L C,  FRIEDLAND R J,  DRISTY M E;  US20010008722-A1   ;  US2002068208-A1 -- US5176966-A   BALLARD POWER SYSTEMS INC (BLRD)   EPP D G,  WIENS B I;  US5523175-A   INT FUEL CELLS INC (ITFU)   BEAL D,  MARTIN R G,  GORMAN M E;  US5698337-A   MTU FRIEDRICHSHAFEN GMBH (MOTU)   NITSCHKE F,  WIND J,  HUBER H;  US5858569-A   PLUG POWER LLC (PLUG-Non-standard)   VITALE N G,  MEACHER J;  US5928807-A   DAIMLER-BENZ AG (DAIM);  BALLARD POWER SYSTEMS INC (BLRD)   HARTMUT E;  US5976726-A   BALLARD POWER SYSTEMS INC (BLRD)   WILKINSON D P,  STUMPER J,  CAMPBELL S A,  DAVIS M T,  LAMONT G J;  US6057054-A   BALLARD POWER SYSTEMS INC (BLRD)   BARTON R H,  GIBB P R,  RONNE J A,  VOSS H H;  US6117287-A   PROTON ENERGY SYSTEMS (PROT-Non-standard)   MOLTER T M,  MOULTHROP L C,  FRIEDLAND R J,  DRISTY M E;  US20010008722-A1   ;  US6171719-B1   UNITED TECHNOLOGIES CORP (UNAC)   ROY R J,  CRITZ K M,  LEONIDA A;  US6602631-B1   LYNNTECH POWER SYSTEMS LTD (LYNN-Non-standard)   CISAR A J,  MURPHY O J,  CLARKE E T;  US6811915-B2 -- DE19821767-A1   SIEMENS AG (SIEI)   WAIDHAS M,  HELMOLT R V,  BUCHNER P,  NOELSCHER C;  US5176966-A   BALLARD POWER SYSTEMS INC (BLRD)   EPP D G,  WIENS B I;  US5523175-A   INT FUEL CELLS INC (ITFU)   BEAL D,  MARTIN R G,  GORMAN M E;  US5698337-A   MTU FRIEDRICHSHAFEN GMBH (MOTU)   NITSCHKE F,  WIND J,  HUBER H;  US5858569-A   PLUG POWER LLC (PLUG-Non-standard)   VITALE N G,  MEACHER J;  US5928807-A   DAIMLER-BENZ AG (DAIM);  BALLARD POWER SYSTEMS INC (BLRD)   HARTMUT E;  US5976726-A   BALLARD POWER SYSTEMS INC (BLRD)   WILKINSON D P,  STUMPER J,  CAMPBELL S A,  DAVIS M T,  LAMONT G J;  US6057054-A   BALLARD POWER SYSTEMS INC (BLRD)   BARTON R H,  GIBB P R,  RONNE J A,  VOSS H H;  US6117287-A   PROTON ENERGY SYSTEMS (PROT-Non-standard)   MOLTER T M,  MOULTHROP L C,  FRIEDLAND R J,  DRISTY M E;  US20010008722-A1   ;  US6171719-B1   UNITED TECHNOLOGIES CORP (UNAC)   ROY R J,  CRITZ K M,  LEONIDA A;  US6602631-B1   LYNNTECH POWER SYSTEMS LTD (LYNN-Non-standard)   CISAR A J,  MURPHY O J,  CLARKE E T