US2003031970-A1 -- US2999534-A   ;  US3199505-A   ;  US3253641-A   ;  US3817687-A   AER CORP (AERA-Non-standard);  US3897193-A   SHELL OIL CO (SHEL)   KATTAN A,  GWYN J E;  US3914095-A   COMBUSTION UNLIMITE (COMB-Non-standard)   STRAITZ J F;  US3999936-A   HASSELMANN D E M (HASS-Individual)   HASSELMANN D E M;  US4009985-A   HIRT COMBUSTION ENG (HIRT-Non-standard)   HIRT J H;  US4063874-A   CLEAN AIR ENG INC (CLEA-Non-standard)   STARY M L,  BROWN E L,  PRIDONOFF E L;  US4087228-A   PROCESS PRODS INC (PROC-Non-standard)   DATIS A P;  US4292020-A   HIRT COMBUSTION ENG (HIRT-Non-standard)   HIRT J H;  US4680004-A   HIRT COMBUSTION ENG (HIRT-Non-standard)   HIRT J H;  US5107906-A   SWENSON P F (SWEN-Individual)   SWENSEN P F,  EVERSOLE G H;  US5364262-A   PHILLIPS D E (PHIL-Individual)   PHILLIPS D E;  US5421719-A   TOSHIBA KK (TOKE)   SAITO K,  KUMAZAWA K;  US5540208-A   NABCO CORP (NIAI)   KIKUTANI I;  US5938427-A   MATSUSHITA ELEC IND CO LTD (MATU)   SUZUKI J,  HOSAKA M,  MAENISHI A,  YOSHIDA Y;  US6065957-A   NIPPONDENSO CO LTD (NPDE)   KONDO Y,  UEHARA M,  MATSUOKA A;  US7008219-B2 -- DE3402160-A   ;  JP03075408-A   ;  JP05180397-A   ;  JP59225212-A   ;  US2999534-A   ;  US3199505-A   ;  US3253641-A   ;  US3817687-A   AER CORP (AERA-Non-standard);  US3897193-A   SHELL OIL CO (SHEL)   KATTAN A,  GWYN J E;  US3914095-A   COMBUSTION UNLIMITE (COMB-Non-standard)   STRAITZ J F;  US3999936-A   HASSELMANN D E M (HASS-Individual)   HASSELMANN D E M;  US4009985-A   HIRT COMBUSTION ENG (HIRT-Non-standard)   HIRT J H;  US4063874-A   CLEAN AIR ENG INC (CLEA-Non-standard)   STARY M L,  BROWN E L,  PRIDONOFF E L;  US4087228-A   PROCESS PRODS INC (PROC-Non-standard)   DATIS A P;  US4292020-A   HIRT COMBUSTION ENG (HIRT-Non-standard)   HIRT J H;  US4680004-A   HIRT COMBUSTION ENG (HIRT-Non-standard)   HIRT J H;  US5107906-A   SWENSON P F (SWEN-Individual)   SWENSEN P F,  EVERSOLE G H;  US5364262-A   PHILLIPS D E (PHIL-Individual)   PHILLIPS D E;  US5421719-A   TOSHIBA KK (TOKE)   SAITO K,  KUMAZAWA K;  US5540208-A   NABCO CORP (NIAI)   KIKUTANI I;  US5938427-A   MATSUSHITA ELEC IND CO LTD (MATU)   SUZUKI J,  HOSAKA M,  MAENISHI A,  YOSHIDA Y;  US6065957-A   NIPPONDENSO CO LTD (NPDE)   KONDO Y,  UEHARA M,  MATSUOKA A;  WO2000031461-A1   ;  WO2000047463-A1   ;  JP4050019-B2 -- JP02242003-A   ;  JP05133509-A   ;  JP05180397-A   ;  JP08219397-A   ;  JP10172737-A   ;  JP11173549-A   ;  JP11226424-A   ;  JP53091873-A   ;  JP57061899-A   ;  JP2001167781-A