;  US6576208-B1 -- DE4334981-A1   DAIMLER-BENZ AG (DAIM)   PLOG C,  MAUNZ W,  STENGEL T,  ANDORF R;  DE4334983-A1   ;  DE19727589-A1   DBB FUEL CELL ENGINES GMBH (DBBF-Non-standard)   AUTENRIETH R,  STROBEL B;  EP743694-A1   TOYOTA JIDOSHA KK (TOYT)   AOYAMA S;  EP776861-A1   DAIMLER-BENZ AG (DAIM)   HEIL D,  STROBEL B,  WIESHEU N,  ZUR MEGEDE D,  BENZ U;  EP941963-A1   TOYOTA JIDOSHA KK (TOYT)   AOYAMA S;  EP955351-A1   ;  GB846153-A   ;  JP08295503-A   ;  JP10101302-A   TOYOTA JIDOSHA KK (TOYT)   AOYAMA S;  US2747970-A   ;  US3631073-A   ENGELHARD MINERALS & CHEM CORP (ENGH);  US3923646-A   UNIVERSAL OIL PROD CO (UNVO)   HILFMAN L;  US3956190-A   ;  US3972837-A   JOHNSON MATTHEY CO LTD (JOHO);  US3980589-A   ;  US3990998-A   EXXON RES & ENG CO (ESSO)   DELUCA J P,  MCVICKER G B,  MURRELL L L;  US4012337-A   ;  US4036784-A   UOP INC (UNVO);  US4051073-A   ;  US4066740-A   ;  US4077913-A   JOHNSON MATTHEY CO LTD (JOHO);  US4124537-A   ;  US4154812-A   GRACE & CO W R (GRAC)   SANCHEZ M G,  LAINE N R,  ERNEST M V;  US4175056-A   ;  US4189405-A   JOHNSON MATTHEY CO LTD (JOHO)   KNAPTON A G,  MOGILL I R;  US4206087-A   ENGELHARD MINERALS CORP (ENGH);  US4237032-A   JOHNSON MATTHEY CO LTD (JOHO)   EVANS W D J,  LARBEY R J,  STEWART T I;  US4284531-A   UNION OIL CO CALIFORNIA (UNOC)   SIMPSON H D,  GOWDY H W,  LIGHT S D;  US4340579-A   VAW VER ALUMINIUM WERKE AG (VALC)   GREBER J F,  WINKHAUS G;  US4390456-A   GRACE & CO W R (GRAC)   SANCHEZ M G,  ERNEST M V,  LAINE N R;  US4447556-A   ;  US4684618-A   AMERICAN CYANAMID CO (AMCY)   FOLEY H C,  OTOOLE M P;  US4756822-A   MOBIL OIL CORP (MOBI)   CHEN N Y,  HUANG T J H;  US4847231-A   GAS RES INST (GASR-Non-standard)   GRATZEL M,  KIWI J,  THAMPI K R;  US4910180-A   DODUCO DUERRWAECHTER FA E (DURE)   BERNDT M,  KSINSIK D;  US4943549-A   BAYER AG (FARB)   IMMEL O,  SCHWARZ H H,  THIEL R;  US4952549-A   ;  US5023226-A   BAYER AG (FARB)   IMMEL O,  SCHWARZ H H,  THIEL R;  US5248566-A   US DEPT ENERGY (USAT)   KUMAR R,  AHMED S,  KRUMPELT M,  MYLES K M;  US5773657-A   BASF AG (BADI)   RUETTER H,  RUEHL T,  BREITSCHEIDEL B,  HENKELMANN J,  HENNE A,  WETTLING T;  US5874652-A   ;  US5908607-A   SUMITOMO CHEM CO LTD (SUMO)   ABEKAWA H,  ITO Y,  HIBI T;  US5962124-A   CANON KK (CANO)   YOSHINO H,  MIURA K,  KONDO Y;  US6262132-B1   ENERGY INT CORP (ENER-Non-standard)   SINGLETON A H,  OUKACI R,  GOODWIN J G;  US6399035-B1   COSMO RES INST (MAZN);  COSMO OIL CO LTD (MAZN)   TABATA M,  MIYAMOTO K,  YOSHINARI T,  SATO K,  TAKEHARA S;  US6403844-B1   UNIV MICHIGAN STATE (UNMS)   ZHANG Z,  MILLER D J,  JACKSON J E;  US6677068-B2 -- DE4334981-A1   DAIMLER-BENZ AG (DAIM)   PLOG C,  MAUNZ W,  STENGEL T,  ANDORF R;  DE4334983-A1   ;  DE19727589-A1   DBB FUEL CELL ENGINES GMBH (DBBF-Non-standard)   AUTENRIETH R,  STROBEL B;  EP743694-A1   TOYOTA JIDOSHA KK (TOYT)   AOYAMA S;  EP776861-A1   DAIMLER-BENZ AG (DAIM)   HEIL D,  STROBEL B,  WIESHEU N,  ZUR MEGEDE D,  BENZ U;  EP941963-A1   TOYOTA JIDOSHA KK (TOYT)   AOYAMA S;  GB846153-A   ;  JP08295503-A   ;  JP09199156-A   ;  JP10101302-A   TOYOTA JIDOSHA KK (TOYT)   AOYAMA S;  US2747970-A   ;  US3631073-A   ENGELHARD MINERALS & CHEM CORP (ENGH);  US3923646-A   UNIVERSAL OIL PROD CO (UNVO)   HILFMAN L;  US3956190-A   ;  US3980589-A   ;  US4012337-A   ;  US4036784-A   UOP INC (UNVO);  US4051073-A   ;  US4066740-A   ;  US4077913-A   JOHNSON MATTHEY CO LTD (JOHO);  US4124537-A   ;  US4154812-A   GRACE & CO W R (GRAC)   SANCHEZ M G,  LAINE N R,  ERNEST M V;  US4175056-A   ;  US4189405-A   JOHNSON MATTHEY CO LTD (JOHO)   KNAPTON A G,  MOGILL I R;  US4206087-A   ENGELHARD MINERALS CORP (ENGH);  US4237032-A   JOHNSON MATTHEY CO LTD (JOHO)   EVANS W D J,  LARBEY R J,  STEWART T I;  US4284531-A   UNION OIL CO CALIFORNIA (UNOC)   SIMPSON H D,  GOWDY H W,  LIGHT S D;  US4340579-A   VAW VER ALUMINIUM WERKE AG (VALC)   GREBER J F,  WINKHAUS G;  US4390456-A   GRACE & CO W R (GRAC)   SANCHEZ M G,  ERNEST M V,  LAINE N R;  US4447556-A   ;  US4684618-A   AMERICAN CYANAMID CO (AMCY)   FOLEY H C,  OTOOLE M P;  US4756822-A   MOBIL OIL CORP (MOBI)   CHEN N Y,  HUANG T J H;  US4847231-A   GAS RES INST (GASR-Non-standard)   GRATZEL M,  KIWI J,  THAMPI K R;  US4910180-A   DODUCO DUERRWAECHTER FA E (DURE)   BERNDT M,  KSINSIK D;  US4943549-A   BAYER AG (FARB)   IMMEL O,  SCHWARZ H H,  THIEL R;  US4952549-A   ;  US5248566-A   US DEPT ENERGY (USAT)   KUMAR R,  AHMED S,  KRUMPELT M,  MYLES K M;  US5302470-A   OSAKA GAS CO LTD (OSAG);  US5686150-A   LANXIDE TECHNOLOGY CO LP (LANX)   MATSUMOTO R L K;  US5766787-A   TANAKA KIKINZOKU KOGYO KK (TANI);  WATANABE M (WATA-Individual)   WATANABE M,  UCHIDA H;  US5773657-A   BASF AG (BADI)   RUETTER H,  RUEHL T,  BREITSCHEIDEL B,  HENKELMANN J,  HENNE A,  WETTLING T;  US5962124-A   CANON KK (CANO)   YOSHINO H,  MIURA K,  KONDO Y;  US6168772-B1   WATANABE M (WATA-Individual)   WATANABE M;  US6335112-B1   AISIN SEIKI KK (AISE)   AKAKABE M,  SHA T;  JP3715482-B2 -- JP04027439-A   ;  JP07024320-A   ;  JP09266005-A   ;  JP10029803-A   ASAHI KASEI KOGYO KK (ASAH);  NOGUCHI INST (NOGK)   FUKUOKA Y,  TOMOKUNI K,  NAKAJIMA H;  JP11114423-A   NISSAN MOTOR CO LTD (NSMO)   ETO Y,  KANEKO H;  JP2001149779-A   NE CHEMCAT CORP (NECH-Non-standard);  HONDA GIKEN KOGYO KK (HOND)   NAKA T,  TAKAYAMA M,  USAKA O,  ISOBE S,  ITO T,  KURABAYASHI K;  DE10053989-B4 -- DE4334981-A1   DAIMLER-BENZ AG (DAIM)   PLOG C,  MAUNZ W,  STENGEL T,  ANDORF R;  DE4334983-A1   ;  DE19727589-A1   DBB FUEL CELL ENGINES GMBH (DBBF-Non-standard)   AUTENRIETH R,  STROBEL B;  DE2812875-C   GRACE & CO W R (GRAC)   SANCHEZ M G,  LAINE N R,  ERNEST M V;  EP743694-A1   TOYOTA JIDOSHA KK (TOYT)   AOYAMA S;  EP776861-A1   DAIMLER-BENZ AG (DAIM)   HEIL D,  STROBEL B,  WIESHEU N,  ZUR MEGEDE D,  BENZ U;  EP941963-A1   TOYOTA JIDOSHA KK (TOYT)   AOYAMA S;  EP955351-A1   ;  GB846153-A   ;  US2747970-A   ;  US3631073-A   ENGELHARD MINERALS & CHEM CORP (ENGH)