US7011694-B1 -- JP06071148-A   ;  US4230463-A   MONSANTO CO (MONS)   HENIS J M S,  TRIPODI M K;  US4242208-A   TEIJIN LTD (TEIJ)   KAWAGUCHI T,  TAKETANI Y,  MINEMATSU H;  US4551156-A   STANDARD OIL CO OHIO (STAH)   LI G S;  US4659343-A   CYNARA CO (CYNA-Non-standard)   KELLY R M;  US4690873-A   ;  US4981497-A   DU PONT DE NEMOURS & CO E I (DUPO)   HAYES R A;  US5032149-A   ;  US5034027-A   ;  US5074891-A   HOECHST CELANESE CORP (FARH)   KOHN R S,  JONES S R,  MUELLER W H;  US5085676-A   DU PONT DE NEMOURS & CO E I (DUPO)   EKINER O M,  HAYES R A,  MANOS P;  US5207908-A   X-FLOW BV (XFLO-Non-standard)   KOENHEN D M,  TINNEMANS A H;  US5215554-A   PERMEA INC (PERM-Non-standard)   KRAMER P W,  MURPHY M K,  STOOKEY D J,  HENIS J M S,  STEDRONSKY E R;  US5232472-A   DU PONT DE NEMOURS & CO E I (DUPO);  AIR LIQUIDE (AIRL)   SIMMONS J W,  EKINER O M;  US5248319-A   DU PONT DE NEMOURS & CO E I (DUPO)   EKINER O M,  SIMMONS J W;  US5266100-A   ;  US5320650-A   ;  US5334697-A   AIR LIQUIDE SA (AIRL)   SIMMONS J W;  US5558936-A   HOECHST CELANESE CORP (FARH)   CHUNG T,  KAFCHINSKI E R;  US5591250-A   GAS RES INST (GASR-Non-standard)   HOUDE A Y,  ZHOU G,  STERN S A,  KAWAKAMI H;  US5611843-A   ;  US5618332-A   AIR LIQUIDE SA (AIRL)   EKINER O M,  FLEMING G K;  US5679133-A   DOW CHEM CO (DOWC)   MOLL D J,  BURMESTER A F,  YOUNG T C,  MCREYNOLDS K B,  CLARK J E,  HOTZ C Z,  WESSLING R A,  QUARDERER G J,  LARCHER R M,  JEANES T O,  BECK H N,  BALES S E,  SMITH B L;  US5702503-A   HOECHST CELANESE CORP (FARH)   TSE TANG M;  US5725633-A   ;  US5756643-A   EXXON RES & ENG CO (ESSO)   SARTORI G,  HO W S W,  THALER W A,  DALRYMPLE D C;  US5820659-A   AIR LIQUIDE SA (AIRL)   EKINER O M,  FLEMING G K;  US5837032-A   DOW CHEM CO (DOWC)   MOLL D J,  BURMESTER A F,  YOUNG T C,  MCREYNOLDS K B,  CLARK J E,  HOTZ C Z,  WESSLING R A,  QUARDERER G J,  LARCHER R M,  JEANES T O,  BECK H N,  BALES S E,  SMITH B L;  US5882382-A   NITTO DENKO CORP (NITL)   HACHISUGA H,  IKEDA K;  US5922104-A   KOREA ADV INST SCI & TECHNOLOGY (KOAD)   PARK H C,  NAH J S,  KANG Y S,  LEE C J;  US5939520-A   AIR PROD & CHEM INC (AIRP)   LANGSAM M;  US6156097-A   DU PONT DE NEMOURS & CO E I (DUPO)   OBRIEN W G,  NOELKE C J,  HARKER R C;  US6156381-A   MG GENERON INC (MGGE-Non-standard)   LEONG P J,  COAN F L,  JENSVOLD J A,  JEANS T O;  US6171472-B1   ;  US6296684-B1   AIR LIQUIDE SA (AIRL)   EKINER O M;  US6383258-B1   ;  US6383265-B1   AIR LIQUIDE SA (AIRL)   EKINER O M;  US6660062-B2   LIU Y (LIUY-Individual);  LI D (LIDD-Individual);  WANG R (WANG-Individual);  CHUNG T (CHUN-Individual)   LIU Y,  LI D,  WANG R,  CHUNG T;  WO1998041308-A1