WO9521468-A1 -- US5237031-A   ;  AU9347791-A   VALENCE TECHNOLOGY INC (VALE-Non-standard)   GOLOVIN M N;  US4115206-A   PHILLIPS PETROLEUM CO (PHIP)   MURTHA T P;  US4247499-A   GENERAL ELECTRIC CO (GENE)   GLUGLA P G,  BRIANT J L,  GALLUCCI R R;  US4384115-A   DOW CHEM CO (DOWC)   RENGA J M;  US4388385-A   ;  US4394280-A   VARTA AG (VART)   VONALPEN U,  BRAEUTIGAM R,  OLIAPURAM A;  US4414607-A   ;  US4423205-A   ETHYL CORP (ETHY)   RAJAN S J;  US4432891-A   ;  US4539276-A   ;  US4557985-A   ;  US4695291-A   ;  US4747850-A   CHEVRON RES CO (CALI)   WOLLENBERG R H,  PLAVAC F;  US4830939-A   MHB JOINT VENTURE (MHBJ-Non-standard)   LEE M T,  SHACKLE D,  SCHWAB G;  US4908283-A   UBE IND LTD (UBEI)   ASHITAKA H,  TAKAHASHI T,  SHIMIZU R;  US4925751-A   MEAD CORP (MEAC);  MHB JOINT VENTURE (MHBJ-Non-standard);  DEVERSE MS CO (DEVE-Non-standard);  HOPE & LANDSGUARD ENG IN (HOPE)   SHACKLE D R,  FAUTEUX D G,  LUNDSGAARD J S;  US4990413-A   MHB JOINT VENTURE (MHBJ-Non-standard)   LEE M T,  FAUTEUX D;  US5491039-A -- US4060674-A   EXXON RES & ENG CO (ESSO)   KLEMANN L P,  NEWMAN G H;  US4115206-A   PHILLIPS PETROLEUM CO (PHIP)   MURTHA T P;  US4247499-A   GENERAL ELECTRIC CO (GENE)   GLUGLA P G,  BRIANT J L,  GALLUCCI R R;  US4384115-A   DOW CHEM CO (DOWC)   RENGA J M;  US4388385-A   ;  US4394280-A   VARTA AG (VART)   VONALPEN U,  BRAEUTIGAM R,  OLIAPURAM A;  US4414607-A   ;  US4423205-A   ETHYL CORP (ETHY)   RAJAN S J;  US4432891-A   ;  US4539236-A   VILUTIS & CO (VILU)   VILUTIS L J;  US4557985-A   ;  US4695291-A   ;  US4747850-A   CHEVRON RES CO (CALI)   WOLLENBERG R H,  PLAVAC F;  US4752544-A   ;  US4830939-A   MHB JOINT VENTURE (MHBJ-Non-standard)   LEE M T,  SHACKLE D,  SCHWAB G;  US4894302-A   DOW CHEM CO (DOWC)   HOFFMAN R J,  WINTERTON R C,  GREGORY T D;  US4908283-A   UBE IND LTD (UBEI)   ASHITAKA H,  TAKAHASHI T,  SHIMIZU R;  US4925751-A   MEAD CORP (MEAC);  MHB JOINT VENTURE (MHBJ-Non-standard);  DEVERSE MS CO (DEVE-Non-standard);  HOPE & LANDSGUARD ENG IN (HOPE)   SHACKLE D R,  FAUTEUX D G,  LUNDSGAARD J S;  US4990413-A   MHB JOINT VENTURE (MHBJ-Non-standard)   LEE M T,  FAUTEUX D;  US5237031-A