US6296766-B1 -- US3933628-A   BIO-GAS OF COLORADO (BIOG-Non-standard)   VARANI F T;  US4100023-A   MCDONALD BA (MCDO-Individual)   MCDONALD B A;  US4161426-A   ;  US4437987-A   THORNTON M L (THOR-Individual)   THRONTON M L,  BOYT A J;  US4613433-A   ;  US4648968-A   CHICAGO BRIDGE & IRON CO (CBRI)   CUTLER D R;  US4710292-A   ATARA CORP (ATAR-Non-standard)   DEVOS J;  US5080786-A   ;  US5082486-A   ;  US5158593-A   DELIMA D D (DELI-Individual)   DELIMA D D;  US5185079-A   UNIV IOWA STATE RES FOUND INC (IOWA)   DAGUE R R;  US5207911-A   SAN VALERIANO SPA (SVAL-Non-standard)   PELLEGRIN R,  TASCA S,  TASCA F;  US5227051-A   ;  US5240611-A   ;  US5248423-A   DEGREMONT (DEGM);  INRA INST NAT RECH AGRONOMIQUE (INRG);  CNRS CENT NAT RECH SCI (CNRS)   MOLETTA R,  EHLINGER F,  COUDERC J;  US5282879-A   ENICHEM AGRIC SPA (ENIE)   BACCARANI C;  US5310485-A   ;  US5389258-A   ORGANIC WASTE SYSTEMS NV (ORGA-Non-standard)   SMIS J R G,  DE BAERE L A;  US5393317-A   RELAND IND INC (RELA-Non-standard)   ROBINSON E C;  US5423895-A   BAKER HUGHES INC (BAKO)   BROWN D P,  WIGHT J L,  COOK L W;  US5451319-A   ;  US5470745-A   ;  US5490933-A   ;  US5500118-A   ;  US5500123-A   INST GAS TECHNOLOGY (IGTE)   SRIVASTAVA V J;  US5500306-A   ZTEK CORP (ZTEK-Non-standard)   WEI I W,  HSU M S;  US5525228-A   ;  US5525229-A   UNIV NORTH CAROLINA STATE (UYNC)   SHIH J C H;  US5527464-A   BARTHA I (BART-Individual)   BARTHA I,  HEREDY S;  US5529692-A   REA RECYCLING ENERGIE ABFALL GMBH (REAR-Non-standard)   KUEBLER H;  US5547578-A   KRUEGER SYSTEMS AS I (KRUE-Non-standard)   NIELSEN M K;  US5581459-A   HITACHI LTD (HITA)   YAHAGI H,  YODA M,  HARA N,  WATANABE S,  ENBUTSU I,  BABA K;  US5589068-A   KRUEGER SYSTEMS AS I (KRUE-Non-standard)   NIELSEN M K;  US5597399-A   BASU D (BASU-Individual);  BASU S M (BASU-Individual)   BASU S M,  BASU D;  US5601720-A   SCHMID W (SCHM-Individual)   SCHMID W;  US5637219-A   GRAESSER CONTACTORS LTD (GRAE-Non-standard)   ROBINSON LF,  SKILL S C,  BENTLEY J;  US5774633-A   HITACHI LTD (HITA)   BABA K,  ENBUTSU I,  MARUHASHI F,  WATANABE S,  YAHAGI H,  MATSUZAKI H,  MATSUMOTO H,  NOGITA S;  US5806903-A   GEORGE S R (GEOR-Individual)   GEORGE S R