Electrical safety detonator

Claim 1

IN A DETONATOR INCLUDING A HOLLOW CASE WITH AN OPEN END; AN ELECTRICALLY-IGNITED BLASTING CAP DISPOSED WITHIN SAID CASE; AND A METAL CLOSURE MEMBER SEALINGLY CLOSING SAID OPEN END AGAINST ENTRY OF FLUID AND HAVING AT LEAST ONE PASSAGE EXTENDING THERETHROUGH, THE IMPROVEMENT COMPRISING: AN ELECTRICALLY-CONDUCTIVE METAL CONDUCTOR MEMBER PROVIDING AN ELECTRICAL CONNECTION BETWEEN SAID BLASTING CAP AND THE EXTERIOR OR SAID CLOSURE MEMBER AND HAVING A SHOULDER ABUTTING SAID CLOSURE MEMBER AND PERIPHERAL SURFACE PORTIONS RECEIVED IN COMPLEMENTARY SURFACE PORTIONS OF SAID PASSAGE, AT LEAST ONE OF SAID METAL CONDUCTOR AND CLOSURE MEMBERS BEING OF ALUMINUM AND HAVING ITS SURFACE PORTIONS ANODIZED TO PROVIDE ELECTRICAL INSULATION BETWEEN SAID MEMBERS; AND SEAL MEANS FOR PRESSURE SEALING SAID CONDUCTOR MEMBER IN AND RELATIVE TO SAID CLOSURE MEMBER INCLUDING AN ANNULAR SEALING RING SEALINGLY ENGAGED BETWEEN SAID METAL CONDUCTOR AND CLOSURE MEMBERS.