Static resistant initiator

Claim 1

AN ELECTRIC BLASTING CAP ASSEMBLY WHICH COMPRISES A SUBSTANTIALLY CYCLINDRICAL METALLIC SHELL, CLOSED AT ONE END; A DIELECTRIC BODY WITHIN SAID SHELL, AND SPACED FROM THE SAID CLOSED END, AS A CLOSURE THEREFOR; AN ELONGATED SEMICONDUCTIVE PLUG WITHIN, AND COAXIAL WITH, SAID SHELL INTERMEDIATE SAID CLOSED END AND SAID DIELECTRIC BODY, SAID PLUG CONTAINING SUBSTANTIALLY CYLINDRICAL END SECTIONS OF DIFFERENT CROSS SECTIONAL DIAMETERS AND DISPOSED WITH ITS LARGER DIAMETER END SECTION ADJACENT SAID DIELECTRIC PLUG AND ITS SMALLER DIAMETER END SECTION INTERMEDIATE SAID LARGER DIAMETER END SECTION AND SAID CLOSED SHELL END, AND STEPPED INWARDLY FROM THE LARGER DIAMETER END SECTION TO THE SMALLER DIAMETER END SECTION, IN AT LEAST A FIRST STAGE, ALONG A CONICAL SURFACE AT AN ANGLE ALPHA, DESCRIBED HEREINAFTER; SAID SEMICONDUCTIVE BODY BEING DISPOSED AT THE ENTIRE SIDE WALL SURFACE OF ITS LARGER DIAMETER END SECTION IN DIRECT, AND ELECTRICALLY CONDUCTIVE, CONTACT WITH THE INNER WALL OF SAID SHELL, AND ALONG THE REMAINDER OF ITS LENGTH IN SPACED APART RELATIONSHIP WITH THE SHELL INNER WALL TO FORM AN ANNULUS THEREWITH; A PAIR OF ELECTRICAL CONDUCTOR WIRES EXTENDING LONGITUDINALLY, AND SPACED APART, INTO SAID SHELL THROUGH SAID DIELECTRIC BODY AND SAID SEMICONDUCTIVE PLUG AND TERMINATING INTERMEDIATE SAID CLOSED SHELL END AND THE SAID SEMICONDUCTIVE PLUG; AN ELECTRICAL RESISTANCE WIRE CONNECTING THE TERMINAL ENDS OF SAID CONDUCTORS; AN IGNITION COMPOSITION, WITHIN SAID SHELL, INTERMEDIATE SAID SEMICONDUCTIVE PLUG AND SAID CLOSED SHELL END IN DIRECT