Glass electrode apparatus and process for making same

Claim 1

AN ELECTRODE ASSEMBLY FOR DETERMINING CONCENTRATIONS OF A FIRST SPECIES OF ION IN AN ENVIRONMENT HAVING A CONCENTRATION OF A SECOND IONIC SPECIES, SAID ASSEMBLY COMPRISING, IN COMBINATION; A FIRST ELECTRODE COMPRISING A MEMBRANE OF GLASS PREFERENTIALLY SENSITIVE TO SAID FIRST SPECIES AND HAVING IN INTIMATE PHYSICAL AND ELECTRICAL CONTACT WITH THE SURFACE THEREOF A SOLID, FUSED, ELECTRICALLY-CONDUCTIVE, INTEGRAL MASS OF AN IONIC MATERIAL; A SECOND ELECTRODE COMPRISING A MEMBRANE OF GLASS PREFERENTIALLY SENSITIVE TO SAID SECOND SPECIES, AND HAVING IN INTIMATE PHYSICAL AND ELECTRICAL CONTACT WITH ONE SURFACE THEREOF A SOLID, FUSED, ELECTRICALLYCONDUCTIVE, INTEGRAL MASS OF AN IONIC MATERIAL; MEANS FOR DISPOSING SAID ELECTRODE SO THAT AT LEAST PORTIONS FO OPPOSITE SURFACES OF SAID MEMBRANE ARE ADAPTED TO CONTACT SAID ENVIRONMENT; AND METALLIC, ELECRICALLY-CONDUCTIVE LEADS OF A METAL SELECTED FROM THE GROUP CONSISITNG OF SILVER AND THALLIUM IN INTIMATE PHYSICAL AND ELECTRICAL CONTACT WITH EACH OF SAID MASSES OF IONIC MATERIAL, SAID MATERIALS BEING SUBSTANTIALLY A HALIDE OF THE METAL; AND MEANS FOR ELECTRICALLY CONNECTING SAID ELECTRODES TO ONE ANOTHER THROUGH A MEASURING DEVICE.