US2003012992-A1 -- US3061658-A   ;  US3279772-A   ;  US3507702-A   UNITED AIRCRAFT CORP (UNAC);  US3677823-A   ;  US4129685-A   UNITED TECHNOLOGIES CORP (UNAC);  US4177328-A   US SEC OF AIR FORCE (USAF)   ROGERS H H;  US4463067-A   ENGELHARD CORP (ENGH)   ADIHART O J,  COHN J G,  FEIGENBAUM H,  KAUFMAN A;  US4530886-A   UNITED TECHNOLOGIES CORP (UNAC)   SEDERQUIST R A;  US4584249-A   NAT AERO & SPACE ADMIN (USAS)   SMITHRICK J J;  US4643954-A   US DEPT ENERGY (USAT);  US GOVERNMENT (USGO)   SMITH J L;  US4765396-A   NAT AERO & SPACE ADMIN (USAS)   SEIDENBERG B;  US4769297-A   INT FUEL CELLS CORP (ITFU)   REISER C A,  SAWYER R D;  US4826742-A   INT FUEL CELLS CORP (ITFU)   REISER C A;  US4883116-A   NAT AERO & SPACE ADMIN (USAS)   SEIDENBERG B,  SWANSON T D;  US4929414-A   US SEC OF AIR FORCE (USAF)   LEONARD J F,  BEAM J E;  US5064732-A   INT FUEL CELLS CORP (ITFU)   MEYER A P;  US5246551-A   CHEMETICS INT INC (CHEM-Non-standard)   PLETCHER D,  GENDERS J D,  WEINBERG N L,  SPIEGEL E F;  US5262250-A   TANAKA KIKINZOKU KOGYO KK (TANI);  WATANABE M (WATA-Individual)   WATANABE M;  US5314761-A   MANNESMANN AG (MANS);  KTI GROUP BV (KTIK-Non-standard)   PIETROGRAN P,  GIACOBBE F;  US5322744-A   FUJI ELECTRIC CO LTD (FJIE)   KOSEKI K;  US5358799-A   ROLLS ROYCE & ASSOC LTD (RORO)   GARDNER F J;  US5368786-A   WISCONSIN ALUMNI RES FOUND (WISC)   MACAULAY P D,  VIGNALI J C,  DINAUER W R,  OTIS D R,  EL-WAKIL M M;  US5382478-A   BALLARD POWER SYSTEMS INC (BLRD)   WOZNICZKA B M,  CHOW C Y;  US5432023-A   TOSHIBA KK (TOKE)   YAMADA S,  KANDA M,  YAMAMOTO M,  SUZUKI N,  KANAZAWA R,  MOTOMIYA A,  KONDO T,  UCHIDA T,  HASHIMOTO K,  NIKI H,  SASAKI K,  TSURUTA S;  US5458837-A   POLYCERAMICS INC (POLY-Non-standard)   HAYES K G,  ROBERTS P A;  US5534363-A   ROCKWELL INT CORP (ROCW)   NAVRATIL J D,  SPROUSE K M;  US5641586-A   UNIV CALIFORNIA OFFICE TECHNOLOGY (REGC)   WILSON M S;  US5686199-A   ALLIED-SIGNAL INC (ALLC)   WALSWORTH E,  CAVALCA C,  HOMEYER S T;  US5705118-A   POLYCERAMICS INC (POLY-Non-standard)   SPITULNIK F R,  ROBERTS P A,  HAYES K G;  US5759394-A   ALLIED-SIGNAL INC (ALLC)   ROHRBACH R P,  JONES G W,  UNGER P D,  BAUSE D,  XUE L,  DOONDERO R;  US5853909-A   INT FUEL CELLS LLC (ITFU-Non-standard)   REISER C;  US5891221-A   ALLIED-SIGNAL INC (ALLC)   JONES G,  DONDERO R,  UNGER P,  BAUSE D,  ROHRBACH R,  XUE L;  US5972530-A   ELECTROCHEM INC (ELEC-Non-standard)   SHELEKIN A B,  BUSNELL C L,  PIEN M S;  US5998058-A   INT FUEL CELLS CORP (ITFU)   FREDLEY R R;  US6015633-A   PLUG POWER LLC (PLUG-Non-standard)   CARLSTROM C M,  ACKER W P;  US6057051-A   MATSUSHITA ELECTRIC IND CO LTD (MATU)   UCHIDA M,  FUKUOKA Y,  SUGAWARA Y,  EDA N;  US6066408-A   PLUG POWER INC (PLUG-Non-standard)   VITALE N G,  JONES D O;  US6080357-A   KATAYAMA SPECIAL IND LTD (KATA-Non-standard)   SUGIKAWA H;  US6146779-A   PLUG POWER INC (PLUG-Non-standard)   WALSH M M;  US6210612-B1   PORVAIR CORP (PORU)   PICKRELL G R,  BUTCHER K R;  US6221522-B1   SIEMENS WESTINGHOUSE POWER CORP (SIEI)   ZAFRED P R,  DEDERER J T,  TOMLINS G W,  TOMS J M,  FOLSER G R,  SCHMIDT D S,  SINGH P,  HAGER C A;  US6232005-B1   GENERAL MOTORS CORP (GENK)   PETTIT WILLIAM H;  US6232010-B1   LYNNTECH INC (LYNN-Non-standard)   SALINAS C,  CISAR A J,  MURPHY O J,  SIMPSON S,  MOADDEL H,  JENG K,  WENG D;  US6235665-B1   PORVAIR CORP (PORU)   PICKRELL G R,  BUTCHER K R;  US6383519-B1   PARTISYN INC (PART-Non-standard)   SAPIESZKO R S,  DYCHALA D H,  ERBE E M;  US6555262-B1   HONEYWELL INT INC (HONE)   KAISER M,  REHG T J;  US858-H   US SEC OF AIR FORCE (USAF)   LEONARD J F,  VUKSON S,  FRITTS D H,  KIM K Y;  US6913844-B2 -- US3061658-A   ;  US3279772-A   ;  US3507702-A   UNITED AIRCRAFT CORP (UNAC);  US3677823-A   ;  US4129685-A   UNITED TECHNOLOGIES CORP (UNAC);  US4177328-A   US SEC OF AIR FORCE (USAF)   ROGERS H H;  US4463067-A   ENGELHARD CORP (ENGH)   ADIHART O J,  COHN J G,  FEIGENBAUM H,  KAUFMAN A;  US4530886-A   UNITED TECHNOLOGIES CORP (UNAC)   SEDERQUIST R A;  US4584249-A   NAT AERO & SPACE ADMIN (USAS)   SMITHRICK J J;  US4643954-A   US DEPT ENERGY (USAT);  US GOVERNMENT (USGO)   SMITH J L;  US4765396-A   NAT AERO & SPACE ADMIN (USAS)   SEIDENBERG B;  US4769297-A   INT FUEL CELLS CORP (ITFU)   REISER C A,  SAWYER R D;  US4826742-A   INT FUEL CELLS CORP (ITFU)   REISER C A;  US4883116-A   NAT AERO & SPACE ADMIN (USAS)   SEIDENBERG B,  SWANSON T D;  US4929414-A   US SEC OF AIR FORCE (USAF)   LEONARD J F,  BEAM J E;  US5064732-A   INT FUEL CELLS CORP (ITFU)   MEYER A P;  US5176966-A   BALLARD POWER SYSTEMS INC (BLRD)   EPP D G,  WIENS B I;  US5246551-A   CHEMETICS INT INC (CHEM-Non-standard)   PLETCHER D,  GENDERS J D,  WEINBERG N L,  SPIEGEL E F;  US5262250-A   TANAKA KIKINZOKU KOGYO KK (TANI);  WATANABE M (WATA-Individual)   WATANABE M;  US5314761-A   MANNESMANN AG (MANS);  KTI GROUP BV (KTIK-Non-standard)   PIETROGRAN P,  GIACOBBE F;  US5322744-A   FUJI ELECTRIC CO LTD (FJIE)   KOSEKI K;  US5358799-A   ROLLS ROYCE & ASSOC LTD (RORO)   GARDNER F J;  US5368786-A   WISCONSIN ALUMNI RES FOUND (WISC)   MACAULAY P D,  VIGNALI J C,  DINAUER W R,  OTIS D R,  EL-WAKIL M M;  US5382478-A   BALLARD POWER SYSTEMS INC (BLRD)   WOZNICZKA B M,  CHOW C Y;  US5432023-A   TOSHIBA KK (TOKE)   YAMADA S,  KANDA M,  YAMAMOTO M,  SUZUKI N,  KANAZAWA R,  MOTOMIYA A,  KONDO T,  UCHIDA T,  HASHIMOTO K,  NIKI H,  SASAKI K,  TSURUTA S;  US5458837-A   POLYCERAMICS INC (POLY-Non-standard)   HAYES K G,  ROBERTS P A;  US5534363-A   ROCKWELL INT CORP (ROCW)   NAVRATIL J D,  SPROUSE K M;  US5641586-A   UNIV CALIFORNIA OFFICE TECHNOLOGY (REGC)   WILSON M S;  US5686199-A   ALLIED-SIGNAL INC (ALLC)   WALSWORTH E,  CAVALCA C,  HOMEYER S T;  US5705118-A   POLYCERAMICS INC (POLY-Non-standard)   SPITULNIK F R,  ROBERTS P A,  HAYES K G;  US5759394-A   ALLIED-SIGNAL INC (ALLC)   ROHRBACH R P,  JONES G W,  UNGER P D,  BAUSE D,  XUE L,  DOONDERO R;  US5853909-A   INT FUEL CELLS LLC (ITFU-Non-standard)   REISER C;  US5891221-A   ALLIED-SIGNAL INC (ALLC)   JONES G,  DONDERO R,  UNGER P,  BAUSE D,  ROHRBACH R,  XUE L;  US5972530-A   ELECTROCHEM INC (ELEC-Non-standard)   SHELEKIN A B,  BUSNELL C L,  PIEN M S;  US5998058-A   INT FUEL CELLS CORP (ITFU)   FREDLEY R R;  US6015633-A   PLUG POWER LLC (PLUG-Non-standard)   CARLSTROM C M,  ACKER W P;  US6057051-A   MATSUSHITA ELECTRIC IND CO LTD (MATU)   UCHIDA M,  FUKUOKA Y,  SUGAWARA Y,  EDA N;  US6066408-A   PLUG POWER INC (PLUG-Non-standard)   VITALE N G,  JONES D O;  US6080357-A   KATAYAMA SPECIAL IND LTD (KATA-Non-standard)   SUGIKAWA H;  US6146779-A   PLUG POWER INC (PLUG-Non-standard)   WALSH M M;  US6210612-B1   PORVAIR CORP (PORU)   PICKRELL G R,  BUTCHER K R;  US6221522-B1   SIEMENS WESTINGHOUSE POWER CORP (SIEI)   ZAFRED P R,  DEDERER J T,  TOMLINS G W,  TOMS J M,  FOLSER G R,  SCHMIDT D S,  SINGH P,  HAGER C A;  US6232005-B1   GENERAL MOTORS CORP (GENK)   PETTIT WILLIAM H;  US6232010-B1   LYNNTECH INC (LYNN-Non-standard)   SALINAS C,  CISAR A J,  MURPHY O J,  SIMPSON S,  MOADDEL H,  JENG K,  WENG D;  US6235665-B1   PORVAIR CORP (PORU)   PICKRELL G R,  BUTCHER K R;  US6383519-B1   PARTISYN INC (PART-Non-standard)   SAPIESZKO R S,  DYCHALA D H,  ERBE E M;  US6555262-B1   HONEYWELL INT INC (HONE)   KAISER M,  REHG T J;  US858-H   US SEC OF AIR FORCE (USAF)   LEONARD J F,  VUKSON S,  FRITTS D H,  KIM K Y