Precision electrical fuse

Claim 1

A PRECISION ELECTRICAL FUSE FOR PROJECTING AN ELECTRIC CIRCUIT, SAID FUSE COMPRISING THE COMBINATION OF AN ELECTRICALLY INSULATING SUBSTRATE WHICH HAS A LOW THERMAL CONDUCTIVITY AND IS RESISTANT TO HIGH TEMPERATURES, A PAIR OF SPACED APART ELECTRICALLY CONDUCTIVE FUSE ELECTRODES DEPOSITED ON THE SURFACE OF SAID SUBSTRATE IN INTIMATE CONTACT THEREWITH, A COMPOSITE METAL-GLASS FUSE ELEMENT EXTENDING BETWEEN SAID ELECTRODES AND INCLUDING A THIN LAYER OF ELECTRICALLY CONDUCTIVE FUSE METAL SELECTED FROM THE GROUP CONSISTING OF GOLD AND PLATINUM ON THE SURFACE OF SAID SUBSTRATE, SAID METAL LAYER EXTENDING BETWEEN AND ELECTRICALLY CONNECTING SAID ELECTRODES, SAID FUSE METAL BEING ADAPTED TO BLOW WHEN THE ELECTRICAL CURRENT THERETHROUGH EXCEEDS A PREDETERMINED LEVEL, AND A LAYER OF ELECTRICALLY INSULATING GLASS HAVING A MELTING POINT BELOW THAT OF SAID SUBSTRATE BONDED TO SAID SUBSTRATE ON OPPOSITE SIDES OF SAID FUSE METAL AND COVERING SAID FUSE METAL IN INTIMATE CONTACT THEREWITH FOR QUENCHING AND ABSORBING THE FUSE METAL AS IT IS BLOWN WHEREBY ANY ARCS WHICH TEND TO DEVELOP BETWEEN THE FUSE ELECTRODES ARE EFFECTIVELY SUPPRESSED, SAID SUBSTRATE AND SAID FUSE ELEMENT BEING ADAPTED TO MAINTAIN AN ELECTRICAL CONNECTION BETWEEN SAID ELECTRODES UNTIL THE CURRENT THROUGH SAID METAL LAYER INCREASES SUFFICIENTLY TO VAPORIZE THE SAME.