WO9730264-A2 -- EP87283-A   UNICORN INDS PLC (UNIC-Non-standard);  NL IND INC (NATL)   GRAININGER A J;  EP156235-A   NORTON CHRISTENSEN INC (NORT);  EASTMAN CHRISTENSEN CO (EAST-Non-standard)   MESKIN A K;  EP352811-A   NORTON CO (NORT)   HYUN S C,  SUNG C M,  MERRILL L,  CHEN S H,  CSILLAG F;  EP604211-A1   DE BEERS IND DIAMOND DIV PTY LTD (DBEE)   OLMSTEAD B R,  ADIA M M,  TANK K,  ASHBY K P;  EP733777-A2   CAMCO DRILLING GROUP LTD (CMCO)   MATTHIAS T R,  NEWTON A,  SARIK D J;  GB2270492-A   GENERAL ELECTRIC CO (GENE)   FRAZEE R L;  GB2275068-A   BAKER HUGHES INC (BAKO)   SMITH R H;  GB2285236-A   BAKER HUGHES INC (BAKO)   TIBBITS G A;  US4811801-A   SMITH INT INC (SMIT)   SALESKY W J,  CAMPBELL B L;  US4871377-A   FRUSHOUR R H (FRUS-Individual)   FRUSHOUR R H;  US5032147-A   FRUSHOUR R H (FRUS-Individual)   FRUSHOUR R H;  US5119714-A   HUGHES TOOL CO (HUGH)   SCOTT D E,  JUREWICZ S R;  US5316095-A   BAKER HUGHES INC (BAKO)   TIBBITTS G;  US5437343-A   BAKER HUGHES INC (BAKO)   COOLEY C H,  LUND J B,  SMITH R H;  WO9730264-A3 -- EP87283-A   UNICORN INDS PLC (UNIC-Non-standard);  NL IND INC (NATL)   GRAININGER A J;  EP156235-A   NORTON CHRISTENSEN INC (NORT);  EASTMAN CHRISTENSEN CO (EAST-Non-standard)   MESKIN A K;  EP352811-A   NORTON CO (NORT)   HYUN S C,  SUNG C M,  MERRILL L,  CHEN S H,  CSILLAG F;  EP604211-A1   DE BEERS IND DIAMOND DIV PTY LTD (DBEE)   OLMSTEAD B R,  ADIA M M,  TANK K,  ASHBY K P;  EP733777-A2   CAMCO DRILLING GROUP LTD (CMCO)   MATTHIAS T R,  NEWTON A,  SARIK D J;  GB2270492-A   GENERAL ELECTRIC CO (GENE)   FRAZEE R L;  GB2275068-A   BAKER HUGHES INC (BAKO)   SMITH R H;  GB2285236-A   BAKER HUGHES INC (BAKO)   TIBBITS G A;  US4811801-A   SMITH INT INC (SMIT)   SALESKY W J,  CAMPBELL B L;  US4871377-A   FRUSHOUR R H (FRUS-Individual)   FRUSHOUR R H;  US5032147-A   FRUSHOUR R H (FRUS-Individual)   FRUSHOUR R H;  US5119714-A   HUGHES TOOL CO (HUGH)   SCOTT D E,  JUREWICZ S R;  US5316095-A   BAKER HUGHES INC (BAKO)   TIBBITTS G;  US5437343-A   BAKER HUGHES INC (BAKO)   COOLEY C H,  LUND J B,  SMITH R H;  US5924501-A -- EP219959-A   SMITH INT INC (SMIT)   HALL D R;  EP411831-A   REED TOOL CO (CMCO)   NEWTON T A;  EP480895-A   SANDVIK AB (SANV)   WALDENSTRO M,  FISCHER U,  HILLERT L,  DENNIS M;  GB2115460-A   UNICORN INDS PLC (UNIC-Non-standard);  NL IND INC (NATL)   GRAININGER A J;  GB2193740-A   DE BEERS IND DIAMOND DIV PTY LTD (DBEE)   TOMLINSON P N,  TANK K;  GB2240797-A   ;  US3745623-A   ;  US4109737-A   GENERAL ELECTRIC CO (GENE);  US4323130-A   STRATA BIT CORP (STRA-Non-standard)   MAHLON D;  US4381825-A   ;  US4396077-A   STRATA BIT CORP (STRA-Non-standard)   RADTKE R P;  US4410054-A   MAURER ENG INC (MAUR-Non-standard)   NAGEL D D,  APARICIO T;  US4442909-A   ;  US4478298-A   PETROLEUM CONCEPTS (PETR-Non-standard)   HAKE L W,  HUFF C F,  MILLER J W;  US4494618-A   SANTRADE LTD (SANV);  STRATA BIT CORP (STRA-Non-standard)   RADTKE R P;  US4498549-A   ;  US4499795-A   STRATA BIT CORP (STRA-Non-standard)   RADTKE R P;  US4499958-A   STRATA BIT CORP (STRA-Non-standard)   RADTKE R P,  MORRIS W V;  US4511006-A   UNICORN INDS LTD (UNIC-Non-standard);  GRAINGER A J (GRAI-Individual)   GRAINGER A J;  US4545441-A   WILLIAMSON K E (WILL-Individual)   WILLIAMSON K E;  US4592433-A   STRATA BIT CORP (STRA-Non-standard)   DENNIS M D;  US4593777-A   NL IND INC (NATL)   BARR J D;  US4604106-A   SMITH INT INC (SMIT)   HALL D R,  RUSSELL M E,  HALL H T;  US4606418-A   REED TOOL CO (CMCO)   THOMPSON C M;  US4607711-A   ;  US4632196-A   ;  US4690691-A   GENERAL ELECTRIC CO (GENE)   KOMANDURI R;  US4702649-A   ;  US4705123-A   ;  US4714385-A   ;  US4724913-A   STRATA BIT CORP (STRA-Non-standard)   MORRIS W V;  US4729440-A   SMITH INT INC (SMIT)   HALL D R;  US4764434-A   SANDVIK AB (SANV)   ARONSSON S B,  WALDENSTRO M G;  US4784023-A   DIAMANT BOART-STRAT (DIAM-Non-standard)   DENNIS M D;  US4792001-A   SHELL INT RES MIJ BV (SHEL)   ZIJSLING D H;  US4797138-A   GENERAL ELECTRIC CO (GENE)   KOMANDURI R;  US4858707-A   SMITH INT INC (SMIT)   JONES K W,  FYFE G;  US4861350-A   DE BEERS IND DIAMOND DIV PTY LTD (DBEE);  PHAAL C (PHAA-Individual)   PHAAL C,  BURNAND R P;  US4869330-A   EASTMAN CHRISTENSEN CO (EAST-Non-standard)   TIBITTS G A;  US4871377-A   FRUSHOUR R H (FRUS-Individual)   FRUSHOUR R H;  US4872520-A   TRITON ENGIN SERV C (TRIT-Non-standard)   NELSON J R;  US4926950-A   SHELL INT RES MIJ BV (SHEL)   ZIJSLING D H;  US4976324-A   BAKER HUGHES INC (BAKO);  TIBBITTS G A (TIBB-Individual)   TIBBITTS G A;  US4984642-A   SOC IND COMBUSTIBLE (COMB-Non-standard)   RENARD P,  SIONNET J;  US4987800-A   REED TOOL CO (CMCO)   GASAN J A,  TAYLOR M R,  BEX P;  US5011515-A   FRUSHOUR R H (FRUS-Individual)   FRUSHOUR R H;  US5016718-A   TANDBERG G (TAND-Individual)   TANDBERG G;  US5027912-A   EASTMAN CHRISTENSEN CO (EAST-Non-standard);  BAKER HUGHES INC (BAKO);  EASTMAN TELECO CO (EAST-Non-standard)   JURGENS R;  US5028177-A   NORTON CHRISTENSEN INC (NORT);  EASTMAN CHRISTENSEN CO (EAST-Non-standard)   MESKIN A K,  MERRILL L,  PAY C R;  US5045092-A   SMITH INT INC (SMIT)   KESHAVEN M K;  US5054246-A   DE BEERS IND DIAMOND DIV PTY LTD (DBEE);  PHAAL C (PHAA-Individual)   PHAAL C,  MASTRANTON N;  US5103922-A   ;  US5119714-A   HUGHES TOOL CO (HUGH)   SCOTT D E,  JUREWICZ S R;  US5120327-A   DIAMANT BOART STRATABIT USA INC (DIAM-Non-standard)   DENNIS M D;  US5127923-A   US SYNTHETIC CORP (USSY-Non-standard)   BUNTING J,  POPE B;  US5135061-A   REED TOOL CO (CMCO)   NEWTON T A;  US5154245-A   SANDVIK AB (SANV)   WALDENSTRO M,  HILLERT L,  FISCHER U,  DENNIS M;  US5159857-A   DRESSER IND INC (DRES)   JUREWICZ S R,  SCOTT D E;  US5161627-A   BURKETT K H (BURK-Individual)   BURKETT K H;  US5173090-A   DRESSER IND INC (DRES)   JUREWICZ S R,  SCOTT D E;  US5199512-A   CURLETT H B (CURL-Individual)   CURLETT H B;  US5238074-A   BAKER HUGHES INC (BAKO)   TIBBITTS G A,  JOHNS K;  US5248006-A   BAKER HUGHES INC (BAKO)   SCOTT D E,  JUREWICZ S R;  US5264283-A   SANDVIK AB (SANV)   WALDENSTRO M,  FISCHER U,  HILLERT L,  DENNIS M;  US5273125-A   DRESSER IND INC (DRES)   JUREWICZ S R,  SCOTT D E;  US5279375-A   BAKER HUGHES INC (BAKO)   TRUJILLO W R,  TIBBITTS G A;  US5287936-A   BAKER HUGHES INC (BAKO)   SCOTT D E,  GRIMES R E;  US5291957-A   CURLETT H B (CURL-Individual)   CURLETT H B;  US5301762-A   TOTAL (PETF)   BESSON A;  US5314033-A   BAKER HUGHES INC (BAKO)   TIBBITTS G A;  US5316095-A   BAKER HUGHES INC (BAKO)   TIBBITTS G;  US5332051-A   SMITH INT INC (SMIT)   KNOWLTON H R;  US5335738-A   SANDVIK AB (SANV)   WALDENSTRO M,  FISCHER U,  HILLERT L,  DENNIS M;  US5337844-A   BAKER HUGHES INC (BAKO)   TIBBITTS G;  US5346026-A   BAKER HUGHES INC (BAKO)   SCOTT D E,  PESSIER R C O;  US5351772-A   BAKER HUGHES INC (BAKO)   SMITH R H;  US5355969-A   US SYNTHETIC CORP (USSY-Non-standard)   FARR R J,  GRAHAM K G,  HARDY J W,  POPE B J;  US5370717-A   DE BEERS IND DIAMOND DIV PTY LTD (DBEE)   LLOYD A I G,  TANK K;  US5379853-A   SMITH INT INC (SMIT)   JONES K W,  CROCKETT R B,  LOCKWOOD M C,  DIXON R H,  REED C A;  US5379854-A   DENNIS TOOL CO (DENN-Non-standard)   DENNIS T M;  US5433280-A   BAKER HUGHES INC (BAKO)   SMITH R H;  US5435403-A   BAKER HUGHES INC (BAKO)   TIBBITTS G A;  US5437343-A   BAKER HUGHES INC (BAKO)   COOLEY C H,  LUND J B,  SMITH R H;  US5443565-A   ;  US5447208-A   BAKER HUGHES INC (BAKO)   LUND J B,  SMITH R H;  US5460233-A   BAKER HUGHES INC (BAKO)   MEANY N C,  COOLEY C H,  TIBBITS G A;  US5467836-A   BAKER HUGHES INC (BAKO)   SCOTT D E,  PESSIER R C O,  GRIMES R E;  US5472376-A   DE BEERS IND DIAMOND DIV PTY LTD (DBEE)   OLMSTEAD B R,  ADIA M M,  TANK K,  ASHBY K P;  US5492188-A   BAKER HUGHES INC (BAKO)   CHAVES A A,  SMITH R H;  US5499688-A   DENNIS TOOL CO (DENN-Non-standard)   DENNIS M D;  US5590729-A   BAKER HUGHES INC (BAKO)   COOLEY C H,  TIBBITTS G A,  HANSEN W R;  US5605199-A   CAMCO DRILLING GROUP LTD (CMCO)   NEWTON A;  US5662720-A   GENERAL ELECTRIC CO (GENE)   OTIGHEARNAIGH E M;  US32036-E   STRATA BIT CORP (STRA-Non-standard)   MAHLON D;  US6082223-A -- EP219959-A   SMITH INT INC (SMIT)   HALL D R;  EP411831-A   REED TOOL CO (CMCO)   NEWTON T A;  EP480895-A   SANDVIK AB (SANV)   WALDENSTRO M,  FISCHER U,  HILLERT L,  DENNIS M;  GB2115460-A   UNICORN INDS PLC (UNIC-Non-standard);  NL IND INC (NATL)   GRAININGER A J;  GB2193740-A   DE BEERS IND DIAMOND DIV PTY LTD (DBEE)   TOMLINSON P N,  TANK K;  GB2240797-A   ;  US3745623-A   ;  US4109737-A   GENERAL ELECTRIC CO (GENE);  US4323130-A   STRATA BIT CORP (STRA-Non-standard)   MAHLON D;  US4381825-A   ;  US4396077-A   STRATA BIT CORP (STRA-Non-standard)   RADTKE R P;  US4410054-A   MAURER ENG INC (MAUR-Non-standard)   NAGEL D D,  APARICIO T;  US4442909-A   ;  US4478298-A   PETROLEUM CONCEPTS (PETR-Non-standard)   HAKE L W,  HUFF C F,  MILLER J W;  US4494618-A   SANTRADE LTD (SANV);  STRATA BIT CORP (STRA-Non-standard)   RADTKE R P;  US4498549-A   ;  US4499795-A   STRATA BIT CORP (STRA-Non-standard)   RADTKE R P;  US4499958-A   STRATA BIT CORP (STRA-Non-standard)   RADTKE R P,  MORRIS W V;  US4511006-A   UNICORN INDS LTD (UNIC-Non-standard);  GRAINGER A J (GRAI-Individual)   GRAINGER A J;  US4545441-A   WILLIAMSON K E (WILL-Individual)   WILLIAMSON K E;  US4592433-A   STRATA BIT CORP (STRA-Non-standard)   DENNIS M D;  US4593777-A   NL IND INC (NATL)   BARR J D;  US4604106-A   SMITH INT INC (SMIT)   HALL D R,  RUSSELL M E,  HALL H T;  US4606418-A   REED TOOL CO (CMCO)   THOMPSON C M;  US4607711-A   ;  US4632196-A   ;  US4690691-A   GENERAL ELECTRIC CO (GENE)   KOMANDURI R;  US4702649-A   ;  US4705123-A   ;  US4714385-A   ;  US4724913-A   STRATA BIT CORP (STRA-Non-standard)   MORRIS W V;  US4729440-A   SMITH INT INC (SMIT)   HALL D R;  US4764434-A   SANDVIK AB (SANV)   ARONSSON S B,  WALDENSTRO M G;  US4784023-A   DIAMANT BOART-STRAT (DIAM-Non-standard)   DENNIS M D;  US4792001-A   SHELL INT RES MIJ BV (SHEL)   ZIJSLING D H;  US4797138-A   GENERAL ELECTRIC CO (GENE)   KOMANDURI R;  US4858707-A   SMITH INT INC (SMIT)   JONES K W,  FYFE G;  US4861350-A   DE BEERS IND DIAMOND DIV PTY LTD (DBEE);  PHAAL C (PHAA-Individual)   PHAAL C,  BURNAND R P;  US4869330-A   EASTMAN CHRISTENSEN CO (EAST-Non-standard)   TIBITTS G A;  US4871377-A   FRUSHOUR R H (FRUS-Individual)   FRUSHOUR R H;  US4872520-A   TRITON ENGIN SERV C (TRIT-Non-standard)   NELSON J R;  US4926950-A   SHELL INT RES MIJ BV (SHEL)   ZIJSLING D H;  US4976324-A   BAKER HUGHES INC (BAKO);  TIBBITTS G A (TIBB-Individual)   TIBBITTS G A;  US4984642-A   SOC IND COMBUSTIBLE (COMB-Non-standard)   RENARD P,  SIONNET J;  US4987800-A   REED TOOL CO (CMCO)   GASAN J A,  TAYLOR M R,  BEX P;  US5011515-A   FRUSHOUR R H (FRUS-Individual)   FRUSHOUR R H;  US5016718-A   TANDBERG G (TAND-Individual)   TANDBERG G;  US5027912-A   EASTMAN CHRISTENSEN CO (EAST-Non-standard);  BAKER HUGHES INC (BAKO);  EASTMAN TELECO CO (EAST-Non-standard)   JURGENS R;  US5028177-A   NORTON CHRISTENSEN INC (NORT);  EASTMAN CHRISTENSEN CO (EAST-Non-standard)   MESKIN A K,  MERRILL L,  PAY C R;  US5045092-A   SMITH INT INC (SMIT)   KESHAVEN M K;  US5054246-A   DE BEERS IND DIAMOND DIV PTY LTD (DBEE);  PHAAL C (PHAA-Individual)   PHAAL C,  MASTRANTON N;  US5103922-A   ;  US5119714-A   HUGHES TOOL CO (HUGH)   SCOTT D E,  JUREWICZ S R;  US5120327-A   DIAMANT BOART STRATABIT USA INC (DIAM-Non-standard)   DENNIS M D;  US5127923-A   US SYNTHETIC CORP (USSY-Non-standard)   BUNTING J,  POPE B;  US5135061-A   REED TOOL CO (CMCO)   NEWTON T A;  US5152194-A   SMITH INT INC (SMIT)   KESHAVAN M K,  MCDONOUGH S D,  SLAUGHTER R H;  US5154245-A   SANDVIK AB (SANV)   WALDENSTRO M,  HILLERT L,  FISCHER U,  DENNIS M;  US5159857-A   DRESSER IND INC (DRES)   JUREWICZ S R,  SCOTT D E;  US5161627-A   BURKETT K H (BURK-Individual)   BURKETT K H;  US5173090-A   DRESSER IND INC (DRES)   JUREWICZ S R,  SCOTT D E;  US5199512-A   CURLETT H B (CURL-Individual)   CURLETT H B;  US5238074-A   BAKER HUGHES INC (BAKO)   TIBBITTS G A,  JOHNS K;  US5248006-A   BAKER HUGHES INC (BAKO)   SCOTT D E,  JUREWICZ S R;  US5264283-A   SANDVIK AB (SANV)   WALDENSTRO M,  FISCHER U,  HILLERT L,  DENNIS M;  US5273125-A   DRESSER IND INC (DRES)   JUREWICZ S R,  SCOTT D E;  US5279375-A   BAKER HUGHES INC (BAKO)   TRUJILLO W R,  TIBBITTS G A;  US5287936-A   BAKER HUGHES INC (BAKO)   SCOTT D E,  GRIMES R E;  US5291957-A   CURLETT H B (CURL-Individual)   CURLETT H B;  US5301762-A   TOTAL (PETF)   BESSON A;  US5314033-A   BAKER HUGHES INC (BAKO)   TIBBITTS G A;  US5316095-A   BAKER HUGHES INC (BAKO)   TIBBITTS G;  US5332051-A   SMITH INT INC (SMIT)   KNOWLTON H R;  US5335738-A   SANDVIK AB (SANV)   WALDENSTRO M,  FISCHER U,  HILLERT L,  DENNIS M;  US5337844-A   BAKER HUGHES INC (BAKO)   TIBBITTS G;  US5346026-A   BAKER HUGHES INC (BAKO)   SCOTT D E,  PESSIER R C O;  US5351772-A   BAKER HUGHES INC (BAKO)   SMITH R H;  US5355969-A   US SYNTHETIC CORP (USSY-Non-standard)   FARR R J,  GRAHAM K G,  HARDY J W,  POPE B J;  US5370717-A   DE BEERS IND DIAMOND DIV PTY LTD (DBEE)   LLOYD A I G,  TANK K;  US5379853-A   SMITH INT INC (SMIT)   JONES K W,  CROCKETT R B,  LOCKWOOD M C,  DIXON R H,  REED C A;  US5379854-A   DENNIS TOOL CO (DENN-Non-standard)   DENNIS T M;  US5433280-A   BAKER HUGHES INC (BAKO)   SMITH R H;  US5435403-A   BAKER HUGHES INC (BAKO)   TIBBITTS G A;  US5437343-A   BAKER HUGHES INC (BAKO)   COOLEY C H,  LUND J B,  SMITH R H;  US5443565-A   ;  US5447208-A   BAKER HUGHES INC (BAKO)   LUND J B,  SMITH R H;  US5460233-A   BAKER HUGHES INC (BAKO)   MEANY N C,  COOLEY C H,  TIBBITS G A;  US5467836-A   BAKER HUGHES INC (BAKO)   SCOTT D E,  PESSIER R C O,  GRIMES R E;  US5472376-A   DE BEERS IND DIAMOND DIV PTY LTD (DBEE)   OLMSTEAD B R,  ADIA M M,  TANK K,  ASHBY K P;  US5492188-A   BAKER HUGHES INC (BAKO)   CHAVES A A,  SMITH R H;  US5499688-A   DENNIS TOOL CO (DENN-Non-standard)   DENNIS M D;  US5566779-A   ;  US5590729-A   BAKER HUGHES INC (BAKO)   COOLEY C H,  TIBBITTS G A,  HANSEN W R;  US5605199-A   CAMCO DRILLING GROUP LTD (CMCO)   NEWTON A;  US5662720-A   GENERAL ELECTRIC CO (GENE)   OTIGHEARNAIGH E M;  US5743346-A   GENERAL ELECTRIC CO (GENE)   FLOOD G M,  JOHNSON D M,  WILLIAMS B E;  US32036-E   STRATA BIT CORP (STRA-Non-standard)   MAHLON D;  EP828917-B1 -- EP87283-A   UNICORN INDS PLC (UNIC-Non-standard);  NL IND INC (NATL)   GRAININGER A J;  EP156235-A   NORTON CHRISTENSEN INC (NORT);  EASTMAN CHRISTENSEN CO (EAST-Non-standard)   MESKIN A K;  EP352811-A   NORTON CO (NORT)   HYUN S C,  SUNG C M,  MERRILL L,  CHEN S H,  CSILLAG F;  EP604211-A1   DE BEERS IND DIAMOND DIV PTY LTD (DBEE)   OLMSTEAD B R,  ADIA M M,  TANK K,  ASHBY K P;  EP733777-A2   CAMCO DRILLING GROUP LTD (CMCO)   MATTHIAS T R,  NEWTON A,  SARIK D J;  GB2270492-A   GENERAL ELECTRIC CO (GENE)   FRAZEE R L;  GB2275068-A   BAKER HUGHES INC (BAKO)   SMITH R H;  GB2285236-A   BAKER HUGHES INC (BAKO)   TIBBITS G A;  US4811801-A   SMITH INT INC (SMIT)   SALESKY W J,  CAMPBELL B L;  US4871377-A   FRUSHOUR R H (FRUS-Individual)   FRUSHOUR R H;  US5032147-A   FRUSHOUR R H (FRUS-Individual)   FRUSHOUR R H;  US5119714-A   HUGHES TOOL CO (HUGH)   SCOTT D E,  JUREWICZ S R;  US5316095-A   BAKER HUGHES INC (BAKO)   TIBBITTS G;  US5437343-A   BAKER HUGHES INC (BAKO)   COOLEY C H,  LUND J B,  SMITH R H