;  US6929680-B2 -- US2982721-A   ;  US3469934-A   ;  US3618331-A   CHEVRON RES CO (CALI);  US4000990-A   NRG NUFUEL CO (NRGN-Non-standard);  RESERVE SYNTHETIC F (RESE-Non-standard)   BINGHAM L A;  US4080424-A   INST GAS TECHNOLOGY (IGTE)   MILLER L N,  MACRISS R A,  ZAWACKI T S;  US4097250-A   SNAMPROGETTI SPA (SNAM);  US4270937-A   CNG RES CO (CNGR-Non-standard)   ADLER R J,  BROSILOW C B,  BROWN W R;  US4478798-A   LINDE AG (LINM)   KARWAT H;  US4518399-A   MONSANTO CO (MONS)   CROSKELL H,  GRAHAM T E;  US4681612-A   KOCH PROCESSES LTD (KOCH)   OBRIEN J V,  HOLMES A S,  HOPEWELL R B;  US4701187-A   AIR PROD & CHEM INC (AIRP)   CHOE J S,  AUVIL S R,  AGRAWAL R;  US4749555-A   SHELL OIL CO (SHEL)   BUSH W V;  US4770676-A   AIR PROD & CHEM INC (AIRP)   SIRCAR S,  KUMAR R,  KOCH W R,  VANSLOUN J;  US4869894-A   AIR PROD & CHEM INC (AIRP)   WANG S I,  KOCH W R;  US5059405-A   BIO-GAS DEV INC (BIOG-Non-standard)   WATSON J R,  KOPLIN B;  US5451249-A   INT FUEL CELLS CORP (ITFU)   SEDERQUIST R A,  LESIEUR R R,  SANDELLI G J,  SPIEGEL R J,  TROCCIOLA J C,  HEALY H C;  US5453210-A   LUBRIZOL CORP (LUBR)   CLEVELAND W K S,  BARDASZ E A;  US5514129-A   VALLEYLAB INC (VALL-Non-standard)   SMITH G C;  US5529612-A   SOUTHERN PETROLEUM LAB INC (SPET-Non-standard)   TROOST J R;  US5642630-A   ABDELMALEK F T (ABDE-Individual);  RUTSCH M J (RUTS-Individual)   ABDELMALEK F T,  RUTSCH M J;  US5681360-A   ACRION TECHNOLOGIES INC (ACRI-Non-standard)   BROWN W R,  SIWAJEK L A,  COOK W J;  US5817093-A   ETHICON ENDO-SURGERY INC (ETHI)   WILLIAMSON W P,  YATES D C;  US5838008-A   UNIV WOLLONGONG (UYWO-Non-standard)   ESLER M B,  GRIFFITH D W T;  US5842357-A   ACRION TECHNOLOGIES INC (ACRI-Non-standard)   BROWN W R,  COOK W J,  SIWAJEK L A;  US5938819-A   GAS SEPARATION TECHNOLOGY LLC (GASS-Non-standard)   SEERY M W;  US5961701-A   VISION ALMET LTD (VISI-Non-standard)   HLYNSKY J;  US6071326-A   ECOGAS CORP (ECOG-Non-standard)   HALL T L;  US20010001782-A1   ;  US825-H   EXXON PRODN RES CO (ESSO)   GREEN J R,  MORGAN F L;  WO1999039814-A2