;  US6693060-B2 -- KR2001046300-A   KOREA RES INST CHEM TECHNOLOGY (KRIC)   JANG J S,  LEE S S,  PARK J N,  PARK S E;  KR2002021721-A   KOREA GAS CORP (KOGA-Non-standard);  KOREA RES INST CHEM TECHNOLOGY (KRIC);  KYUNGDONG CITYGAS CO LTD (KYUN-Non-standard)   BAEK Y S,  CHOI R S,  JANG J S,  JUN G W,  NOH H S,  OH Y S,  PARK S E,  SONG T Y;  KR2002026074-A   ;  US3644198-A   UNIVERSAL OIL PROD CO (UNVO);  US4046715-A   UOP INC (UNVO)   WILHELM F C;  US4079097-A   UOP INC (UNVO)   ANTOS G J;  US4471144-A   UOP INC (UNVO)   ARENA B J;  US4529718-A   RHONE POULENC SPECIALITES CHIM (RHON)   DUPIN T;  US4722920-A   TOYOTA CENT RES & DEV LAB (TOYW)   KIMURA M,  OZAWA M,  ISOTANI A;  US4891350-A   RHONE-POULENC CHIMI (RHON)   CHOPIN T,  GARREAU F,  KNIPPER M,  NORTIER P,  SCHUPPISER J L;  US4918042-A   TOYOTA JIDOSHA KK (TOYT);  NIPPON STEEL CORP (YAWA);  NIPPON KINZOKU CO LTD (KINZ)   TAKADA T,  MATSUMOTO S,  AOYAGI H,  YAMANAKA M,  OMURA K,  YASHIRO T;  US4920089-A   UNILEVER NV (UNIL)   VANBEEK W P,  DENHOED W,  VANLEEUWEN W A,  POELS E K,  VISSER C;  US4962280-A   ENGELHARD DE MEERN BV (ENGH);  HARSHAW CHEM CO (HARS)   TIJBURG I G M,  GEUS J W;  US4968660-A   VEG-GASINST NV (VEGG-Non-standard);  GAS DE FRANCE (GAZD)   TIJBURG I I M,  GEUS J W;  US5002909-A   MONTEDISON SPA (MONT)   MONTINO F,  SPOTO G;  US5081095-A   GENERAL MOTORS CORP (GENK)   BEDFORD R E,  TSANG C H M;  US5102850-A   GRACE & CO-CONN W R (GRAC)   SANCHEZ M G,  SCHMIDT S R,  ERNEST M V;  US5155085-A   SUMITOMO CHEM CO LTD (SUMO);  US5545602-A   TEXACO DEV CORP (TEXC)   NELSON G V,  NONGBRI G,  PRATT R E,  SHERWOOD D E,  DAI P E;  US5597771-A   ENGELHARD CORP (ENGH)   LUI Y,  DETTLING J C,  WAN C,  HU Z;  US5849977-A   UOP (UNVO)   OROSKAR A R,  KOCAL J A;  US5877106-A   ASEC MFG (ASEC-Non-standard)   KHARAS K C,  MITSCHE R T,  ROBOTA H J,  GATTER M G;  US5972820-A   ASEC MFG (ASEC-Non-standard)   KHARAS K C,  MITSCHE R T,  ROBOTA H J,  GATTER M G;  US6326329-B1   ASEC MFG (ASEC-Non-standard)   NUNAN J G;  US6514904-B1   UOP LLC (UNVO)   MOSER M D,  SHEPHERD R E,  RINGWELSKI A Z,  PARK J Y G