WO200228544-A1 -- US4325843-A   SHELL OIL CO (SHEL)   SLAUGH L H,  HOXMEIER R J;  US4702784-A   KERNFORSCHUNGSANLAGE JUELICH (KERJ)   NAOUMIDIS A,  NEUMEISTER H,  SCHIRBACH A,  STRUCK B D,  TRIEFENBAC D;  US4990372-A   AIR PROD & CHEM INC (AIRP)   SUNDER S,  GARG D,  DYER P N;  US5277987-A   AIR PROD & CHEM INC (AIRP)   CECCARELLI C,  DYER P N,  GARG D,  STEVENS R E;  US6551569-B1 -- US3077385-A   ;  US3848062-A   PPG IND INC (PITT);  US3902917-A   BOSCH GMBH ROBERT (BOSC);  US3943005-A   SIEMENS AG (SIEI);  US4325843-A   SHELL OIL CO (SHEL)   SLAUGH L H,  HOXMEIER R J;  US4664899-A   GTE PROD CORP (SYLV)   KIMMEL E R,  SHAFFER M E,  PINKOWSKI T R,  HARRIS G L;  US4702784-A   KERNFORSCHUNGSANLAGE JUELICH (KERJ)   NAOUMIDIS A,  NEUMEISTER H,  SCHIRBACH A,  STRUCK B D,  TRIEFENBAC D;  US4990372-A   AIR PROD & CHEM INC (AIRP)   SUNDER S,  GARG D,  DYER P N;  US5277987-A   AIR PROD & CHEM INC (AIRP)   CECCARELLI C,  DYER P N,  GARG D,  STEVENS R E;  US5945231-A   CALIFORNIA INST OF TECHNOLOGY (CALY)   SURAMPUDI S,  HALPERT G,  NARAYANAN S;  US5993506-A   TOSHIBA TUNGALLOY KK (TTUN)   KOBAYASHI M,  KITAMURA K,  KINOSHITA S;  GB2385063-A -- US4325843-A   SHELL OIL CO (SHEL)   SLAUGH L H,  HOXMEIER R J;  US4702784-A   KERNFORSCHUNGSANLAGE JUELICH (KERJ)   NAOUMIDIS A,  NEUMEISTER H,  SCHIRBACH A,  STRUCK B D,  TRIEFENBAC D;  US4990372-A   AIR PROD & CHEM INC (AIRP)   SUNDER S,  GARG D,  DYER P N;  US5277987-A   AIR PROD & CHEM INC (AIRP)   CECCARELLI C,  DYER P N,  GARG D,  STEVENS R E;  EP1383611-A1 -- US3077385-A   ;  US3902917-A   BOSCH GMBH ROBERT (BOSC);  US5200060-A   AMOCO CORP (STAD)   SAJKOWSKI D J,  OYAMA S T;  US6090992-A   PHILLIPS PETROLEUM CO (PHIP)   DRAKE C A,  WU A;  WO2000041808-A1   ;  WO2002028773-A1   ;  US6696184-B1 -- US3077385-A   ;  US3848062-A   PPG IND INC (PITT);  US3902917-A   BOSCH GMBH ROBERT (BOSC);  US3943005-A   SIEMENS AG (SIEI);  US4325843-A   SHELL OIL CO (SHEL)   SLAUGH L H,  HOXMEIER R J;  US4664899-A   GTE PROD CORP (SYLV)   KIMMEL E R,  SHAFFER M E,  PINKOWSKI T R,  HARRIS G L;  US4702784-A   KERNFORSCHUNGSANLAGE JUELICH (KERJ)   NAOUMIDIS A,  NEUMEISTER H,  SCHIRBACH A,  STRUCK B D,  TRIEFENBAC D;  US4990372-A   AIR PROD & CHEM INC (AIRP)   SUNDER S,  GARG D,  DYER P N;  US5277987-A   AIR PROD & CHEM INC (AIRP)   CECCARELLI C,  DYER P N,  GARG D,  STEVENS R E;  US5945231-A   CALIFORNIA INST OF TECHNOLOGY (CALY)   SURAMPUDI S,  HALPERT G,  NARAYANAN S;  US5993506-A   TOSHIBA TUNGALLOY KK (TTUN)   KOBAYASHI M,  KITAMURA K,  KINOSHITA S