WO200200578-A2 -- US3445541-A   ;  US3775505-A   CHEVRON RES CO (CALI);  US3864417-A   CHEVRON RES CO (CALI)   HUGHES T R;  US6566569-B1 -- EP353915-A   BRITISH PETROLEUM CO PLC (BRPE)   BARRI S A I;  EP498182-A1   ;  GB1117568-A   ;  US2882244-A   ;  US3130007-A   ;  US3216789-A   ;  US3308069-A   ;  US3415736-A   ;  US3415737-A   ;  US3484499-A   ;  US3546102-A   ;  US3574092-A   ;  US3668268-A   ;  US3668269-A   ;  US3679575-A   ;  US3692470-A   MOBIL OIL CORP (MOBI);  US3699035-A   CHEVRON RES CO (CALI);  US3702886-A   MOBIL OIL CORP (MOBI);  US3709979-A   MOBIL OIL CORP (MOBI);  US3728410-A   CHEVRON RES CO (CALI);  US3773845-A   CHEVRON RES CO (CALI);  US3775505-A   CHEVRON RES CO (CALI);  US3784622-A   CHEVRON RES CO (CALI);  US3808285-A   CHEVRON RES CO (CALI);  US3832449-A   MOBIL OIL CORP (MOBI);  US3852207-A   CHEVRON RES CO (CALI);  US3856876-A   CHEVRON RES CO (CALI);  US3864417-A   CHEVRON RES CO (CALI)   HUGHES T R;  US3904513-A   MOBIL OIL CO (MOBI)   FISCHER R H,  MILSTEIN D,  PETERS A W; 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