US6190536-B1 -- US4230463-A   MONSANTO CO (MONS)   HENIS J M S,  TRIPODI M K;  US4362613-A   MONSANTO CO (MONS)   MACLEAN D L G;  US4364820-A   UOP INC (UNVO)   DEGRAFF R R,  PETERS K D;  US4367135-A   MONSANTO CO (MONS)   MACLEAN D L G;  US4548619-A   UOP INC (UNVO)   STEACY P C;  US4654063-A   AIR PROD & CHEM INC (AIRP)   AGRAWAL R,  AUVIL S R;  US4772295-A   ;  US4836833-A   AIR PROD & CHEM INC (AIRP)   NICHOLAS D M,  GOFF S P,  RODEN T M,  BUSHINSKY J P;  US4857078-A   MEMBRANE TECHNOLOGY & RES INC (MEMB-Non-standard)   WALTER K;  US4892564-A   ;  US4925459-A   INST FRANCAIS DU PETROLE (INSF)   ROJEY A,  DESCHAMPS A,  GREHIER A,  ROBERT E;  US4963165-A   MEMBRANE TECHN & RE (MEMB-Non-standard)   BLUME I,  PINNAU I;  US5015268-A   ;  US5053067-A   AIR LIQUIDE CANADA LTEE (AIRL)   CHRETIEN D;  US5082481-A   LUMMUS CREST INC (LUMM)   BARCHAS K R,  HICKEY T P;  US5157200-A   INST FRANCAIS DU PETROLE (INSF)   MINKKINEN A,  MOURATOFF S,  MANK L;  US5199962-A   MEMBRANE TECHN & RE (MEMB-Non-standard)   WIJMANS J G;  US5256295-A   MEMBRANE TECHNOLOGY & RES (MEMB-Non-standard)   BAKER R W,  WIJMANS J G;  US5332424-A   AIR PROD & CHEM INC (AIRP)   SIRCAR S,  ABRARDO J M,  BAADE W F,  RAO M B;  US5332492-A   UOP (UNVO)   WEIGAND R J,  MITARITEN M J,  MAURER R T,  WHYSALL M;  US5354547-A   AIR PROD & CHEM INC (AIRP)   RAO M B,  SIRCAR S,  ABRARDO J M,  BAADE W F;  US5360533-A   UOP (UNVO)   ZIMMERMANN J E,  HAUN E C,  TAGAMOLILA C P,  LOMAS D A;  US5435836-A   AIR PROD & CHEM INC (AIRP)   SIRCAR S,  ANAND M,  RAO M B;  US5452581-A   RASTOGI A (RAST-Individual);  DINH C X (DINH-Individual);  PETTERSON W C (PETT-Individual);  VERMA V K (VERM-Individual)   VERMA V K,  PETTERSON W C,  DINH C X,  RASTOGI A;  US5507856-A   AIR PROD & CHEM INC (AIRP)   RAO M B,  SIRCAR S;  US5634354-A   AIR PROD & CHEM INC (AIRP)   ROWLES H C,  HOWARD L J;  US5670051-A   MEMBRANE TECHNOLOGY & RES INC (MEMB-Non-standard)   PINNAU I,  TOY L G,  CASILLAS C;  US5689032-A   KRAUSE/PASADYN PARTNERSHIP (KRAU-Non-standard)   KRAUSE W A,  PASADYN R C;  US5744687-A   BOC GROUP INC (BRTO)   RAMACHANDRAN R,  DAO L H;  US5785739-A   MEMBRANE TECHNOLOGY & RES INC (MEMB-Non-standard)   BAKER R W;  US5814208-A   BOC GROUP INC (BRTO)   MENON R K,  RAMACHANDRAN R