US6266977-B1 -- US3511058-A   LINDE AG (LINM);  US4272269-A   ;  US4584006-A   FLEXIVOL INC (FLEX-Non-standard)   APFFEL F;  US4617039-A   ORTLOFF CORP (ORTL-Non-standard);  PRO-QUIP CORP (PROQ-Non-standard);  ELCOR CORP (ELCO-Non-standard)   BUCK L L;  US4707170-A   AIR PROD & CHEM INC (AIRP)   AYRES C L,  ROWLES H C;  US4714487-A   AIR PROD & CHEM INC (AIRP)   ROWLES H C;  US4749393-A   ;  US4752312-A   ;  US4895584-A   PRO-QUIP CORP (PROQ-Non-standard)   BUCK L L,  KEY R D;  US4921514-A   AIR PROD & CHEM INC (AIRP)   ROWLES H C,  AYRES C L;  US5019143-A   ADV EXTRACTION TECH (ADEX-Non-standard);  MEHRTA Y R (MEHR-Individual)   MEHRA Y R;  US5275005-A   ELCOR CORP (ELCO-Non-standard)   HUDSON H M,  CAMPBELL R E,  WILKINSON J D;  US5287703-A   ;  US5377490-A   AIR PROD & CHEM INC (AIRP)   HOWARD L J,  ROWLES H C;  US5461870-A   TECHNIP CIE FR ETUD & CONSTR (TCHP)   PARADOWSKI H;  US5483806-A   AIR PROD & CHEM INC (AIRP)   MILLER J P,  ALLAM R J,  SMITH C D,  TOPHAM A K J;  US5502971-A   ABB LUMMUS CREST INC (ALLM)   WADSWORTH D M,  MCCARTHY F D,  STANLEY S J;  US5520724-A   LINDE AG (LINM)   BAUER H,  BECKER H;  US5555748-A   ELCOR CORP (ELCO-Non-standard)   PIERCE M C,  HUDSON H M,  CAMPBELL R E,  WILKINSON J D;  US5568737-A   ELCOR CORP (ELCO-Non-standard)   CAMPBELL R E,  WILKINSON J D,  HUDSON H M;  US5768912-A   BHP PETROLEUM PTY LTD (BRHI)   DUBAR C A;  US6041620-A   PRAXAIR TECHNOLOGY INC (PRAX)   OLSZEWSKI W J,  ACHARYA A,  WEBER J A,  RASHAD M A,  ARMAN B;  US6041621-A   PRAXAIR TECHNOLOGY INC (PRAX)   OLSZEWSKI W J,  WEBER J A,  ACHARYA A,  ARMAN B;  US6065305-A   PRAXAIR TECHNOLOGY INC (PRAX)   ARMAN B,  BONAQUIST D P,  ACHARYA A,  ROYAL J H,  OLSZEWSKI W J,  WEBER J A;  WO1997013109-A1   ;  EP1148309-A1 -- US4707170-A   AIR PROD & CHEM INC (AIRP)   AYRES C L,  ROWLES H C;  US5379597-A   AIR PROD & CHEM INC (AIRP)   HOWARD L J,  ROWLES H C;  US5626034-A   MANLEY D (MANL-Individual);  HADDAD H (HADD-Individual)   HADDAD H,  MANLEY D;  EP1148309-B1 -- US4707170-A   AIR PROD & CHEM INC (AIRP)   AYRES C L,  ROWLES H C;  US5379597-A   AIR PROD & CHEM INC (AIRP)   HOWARD L J,  ROWLES H C;  US5626034-A   MANLEY D (MANL-Individual);  HADDAD H (HADD-Individual)   HADDAD H,  MANLEY D;  JP3602807-B2 -- JP06055001-A   ;  JP07280431-A   ;  JP03501352-W