US6280864-B1 -- EP989094-A2   HALDOR TOPSOE AS (TOPS)   CHRISTENSEN T S,  HANSEN J B,  CHRISTENSEN P S,  PRIMDAHL I I;  US2191510-A   ;  US3469944-A   ;  US4479925-A   KELLOGG CO M W (PULL)   SHIRES P,  CASSATA J,  MANDELIK B,  VANDIJK C;  US4522894-A   ENGELHARD MINERALS CORP (ENGH)   HWANG H S,  HECK R M,  YARRINGTON R M;  US4691071-A   ;  US4692306-A   KINETICS TEC INT (KINE-Non-standard)   MINET R G,  WARREN D;  US4716023-A   ENERGY RES CORP (ENER-Non-standard)   CHRISTNER L G,  KOEHLER S A;  US4861348-A   HITACHI LTD (HITA)   KOYAMA K,  SUGITA N,  SAKAGUCHI H,  SEIKI N,  HANZAWA A;  US4863712-A   IMPERIAL CHEM IND PLC (ICIL)   TWIGG M V,  SENGELOW W M;  US4869894-A   AIR PROD & CHEM INC (AIRP)   WANG S I,  KOCH W R;  US4925456-A   ;  US4943493-A   INT FUEL CELLS CORP (ITFU)   VARTANIAN G;  US5143800-A   WESTINGHOUSE ELECTRIC CORP (WESE)   REICHNER P,  GEORGE R A,  HOOVER D Q,  SHOCKLING L A;  US5181937-A   STONE & WEBSTER ENG CORP (STWE)   KARAFIAN M,  TSANG I C;  US5226928-A   TOKYO ELECTRIC POWER CO (TOEP);  KOBE SEIKO SHO KK (KOBM)   MAKABE T,  SATO H,  HAGIWARA A,  AOKI M,  SUGIMURA H,  KAWABATA T;  US5401589-A   VICKERS SHIPBUILDING & ENG (VICS);  CJBD LTD (CJBD-Non-standard)   PALMER I,  SEYMOUR C M,  DAMS R A J;  US5486428-A   ROLLS ROYCE PLC (RORO)   GARDNER F J,  DAY M J,  BRANDON N P,  BROWNELL J B;  US5595833-A   ROLLS ROYCE PLC (RORO)   GARDNER F J,  DAY M J,  BRANDON N P,  BROWNELL J B;  US5609834-A   ISHIKAWAJIMA HARIMA HEAVY IND (ISHI)   HAMADA K,  MIZUSAWA M,  KOGA M;  US5641585-A   LOCKHEED IDAHO TECHNOLOGIES CO (LOCK)   LESSING P A,  ZUPPERO A C;  US5648182-A   EQUOS RES KK (EQUS);  AISIN AW CO LTD (AISW)   HARA T,  KATO K,  TAKADA C;  US5651833-A   ;  US5733347-A   INT FUEL CELLS CORP (ITFU)   LESIEUR R R;  US5741474-A   NGK INSULATORS LTD (NIGA)   ISOMURA M,  SOMA T,  TAKAHASHI T;  US5858314-A   ZTEK CORP (ZTEK-Non-standard)   HSU M S,  HOAG E D;  US5861441-A   MARATHON OIL CO (MAOC)   WAYCUILIS J J;  US6120923-A   INT FUEL CELLS LLC (ITFU)   VAN DINE L L,  BONVILLE L J;  WO1997045887-A1   ;  WO1998013294-A1   ;  WO1998046347-A1   ;  WO1998008771-A2