WO2007102028-A1 -- JP58093173-A   ;  JP59184469-A   ;  JP60124367-A   ;  JP63178455-A   ;  US3926676-A   SIEMENS AG (SIEI);  US5993987-A   BALLARD POWER SYSTEMS INC (BLRD)   WOZNICZKA B,  FLETCHER N J,  GIBB P R;  US6040072-A   LYNNTECH INC (LYNN-Non-standard)   MURPHY O J,  SALINAS C,  CISAR A J;  US20030207156-A1   ;  US20050042497-A1   ;  US20050208362-A1   ;  US6218039-B1   PLUG POWER INC (PLUG-Non-standard)   MEASE K L,  BRUNNER A K,  PITTS L A,  WINSLOW A F;  US2009197149-A1 -- US3342641-A   ;  US3912538-A   UNITED AIRCRAFT CORP (UNAC);  US3926676-A   SIEMENS AG (SIEI);  US4444852-A   WESTINGHOUSE ELECTRIC CORP (WESE);  US DEPT ENERGY (USAT);  US5053291-A   FUJI ELECTRIC MFG CO LTD (FJIE)   HIROTA T;  US5480735-A   INT FUEL CELLS CORP (ITFU)   PLASSE P A,  LANDSMAN D A;  US5993987-A   BALLARD POWER SYSTEMS INC (BLRD)   WOZNICZKA B,  FLETCHER N J,  GIBB P R;  US6040072-A   LYNNTECH INC (LYNN-Non-standard)   MURPHY O J,  SALINAS C,  CISAR A J;  US20020155341-A1   ;  US20030198862-A1   ;  US20030207156-A1   ;  US20040110049-A1   ;  US20050042497-A1   ;  US20050208362-A1   ;  US20060234106-A1   ;  US20090053565-A1   ;  US6218039-B1   PLUG POWER INC (PLUG-Non-standard)   MEASE K L,  BRUNNER A K,  PITTS L A,  WINSLOW A F;  US6989216-B2   PUTTAIAH R (PUTT-Individual);  MENJAK Z (MENJ-Individual);  GRADINAROVA L M (GRAD-Individual);  VENKATESAN S (VENK-Individual);  ALADJOV B (ALAD-Individual);  DHAR S (DHAR-Individual);  OVSHINSKY S R (OVSH-Individual)   PUTTAIAH R,  MENJAK Z,  GRADINAROVA L M,  VENKATESAN S,  ALADJOV B,  DHAR S,  OVSHINSKY S R;  EP1992031-B1 -- JP58093173-A   ;  JP59184469-A   ;  JP60124367-A   ;  JP63178455-A   ;  US3926676-A   SIEMENS AG (SIEI);  US5993987-A   BALLARD POWER SYSTEMS INC (BLRD)   WOZNICZKA B,  FLETCHER N J,  GIBB P R;  US6040072-A   LYNNTECH INC (LYNN-Non-standard)   MURPHY O J,  SALINAS C,  CISAR A J;  US20030207156-A1   ;  US20050042497-A1   ;  US20050208362-A1   ;  US6218039-B1   PLUG POWER INC (PLUG-Non-standard)   MEASE K L,  BRUNNER A K,  PITTS L A,  WINSLOW A F