Process for ensuring non-corrosive contacts on heating rods

Claim 2

A PROCESS PERMITTING OF ENSURING A DURABLE ELECTRICAL CONTACT BETWEEN A REFRACTORY MATERIAL INTENDED TO BE BROUGHT TO HIGH TEMPERATURE AND ELECTRICAL CURRENT INPUT AND OUTPUT ELEMENTS, TO WHICH THIS MATERIAL IS CONNECTED THE SAID PROCESS CONSISTING IN DISPOSING BETWEEN THE REFRACTORY MATERIAL AND THE CONNCTION ELEMENTS A PASTE CONSTITUTED BY A MIXTURE OF A FATTY SUBSTANCE AND A SOLVENT WITH A POWDER OF AN ELECTRICALLY CONDUCTIVE METAL HAVING A MELTING POINT APPRECIABLY LOWER THAN THAT OF THE MATERIAL CONSTITUTING THE CONNECTION ELEMENTS, AND THEN HEATING THE ASSEMBLY THUS CONSTITUTED ABOVE A TEMPERATURE HIGHER THAN THE MELTING POINT OF SAID METAL WHEREIN THE PASTE IS CONSTITUTED BY 97% ALUMINUM POWDER, 2% OF DAMMAR GUM AND 1% OF TURPENTINE OIL.

Claim 3

A PROCESS FOE ENSURING A DURABLE NON-CORROSIVE CONTACT BETWEEN A HEATING ROD MEMBER MADE OF AN ELECTRICALLY CONDUCTIVE AND REFRACTORY MATERIAL OF THE CLASS INCLUDING SILICAN CARBIDE AND ELECTRICAL CURRENT CONNECTION ELEMENTS AFFIXED THERETO, SAID PROCESS COMPRISING THE STEPS OF FASHIONING SAID CONNCTION ELEMENTS OF A REFRACTORY METAL NOT SUBSTANTIALLY OXIDIZABLE AT THE TEMPERATURES ENCOUNTERED DURING PROCESSING AND USE SELECTED FROM A CLASS INCLUDING CERTAIN GRADES OF STEEL, FASHIONING SAID CONNECTION ELEMENTS AS CYLINDRICAL METALLIC TIPS HAVING A BLIND BORE WITH A DIAMETER GREATER THAN THAT OF THE ROD AND INTO WHICH FITS THE TWO ENDS OF THE ROD, DISPOSING BETWEEN THE MEMBER AND SAID ELEMENTS A PASTE CONSTITUTED BY A MIXTURE OF A FATTY SUBSTANCE AND A SOLVENT WITH A POWDER OF AN ELECTRICALLY CONDUCTIVE METAL HAVING A MELTING POINT APPRECIABLY LOWER THAN THAT OF THE REFRACTING METAL SELECTED FROM A CLASS INCLUDING ALUMINUM, AND RAPIDLY AND PROGRESSIVELY INCREASING PASSAGE OF ELECTRIC CURRENT THROUGH SAID CONNECTION ELEMENTS TO BRING SAID ROD TO INCANDESCENCE BY THE JOULE EFFECT AT A TEMPERATURE EXCEEDING THE MELTING POINT OF SAID CONDUCTIVE METAL AND BELOW THE CORROSION POINT OF SAID REFRACTORY METAL WHEREBY A CONNECTION IS MADE FREE OF THE FORMATION OF INSULATING OXIDES ON THE CONTRACTING SURFACES.

Claim 4

A PROCESS FOE ENSURING A DURABLE NON-CORROSIVE CONTACT BETWEEN A HEATING ROD MEMBER MADE OF AN ELECTRICALLY CONDUCTIVE AND REFRACTORY MATERIAL OF THE CLASS INCLUDING SILICAN CARBIDE AND ELECTRICAL CURRENT CONNECTION ELEMENTS AFFIXED THERETO, SAID PROCESS COMPRISING THE STEPS OF FASHIONING SAID CONNCTION ELEMENTS OF A REFRACTORY METAL NOT SUBSTANTIALLY OXIDIZABLE AT THE TEMPERATURES ENCOUNTERED DURING PROCESSING AND USE SELECTED FROM A CLASS INCLUDING CERTAIN GRADES OF STEEL, FASHIONING SAID CONNECTION ELEMENTS AS CYLINDRICAL METALLIC TIPS HAVING A BLIND BORE WITH A DIAMETER GREATER THAN THAT OF THE ROD AND INTO WHICH FITS THE TWO ENDS OF THE ROD, DISPOSING BETWEEN THE MEMBER AND SAID ELEMENTS A PASTE CONSTITUTED BY A MIXTURE OF A FATTY SUBSTANCE AND A SOLVENT WITH A POWDER OF AN ELECTRICALLY CONDUCTIVE METAL HAVING A MELTING POINT APPRECIABLY LOWER THAN THAT OF THE REFRACTING METAL SELECTED FROM A CLASS INCLUDING ALUMINUM, AND RAPIDLY AND PROGRESSIVELY INCREASING PASSAGE OF ELECTRIC CURRENT THROUGH SAID CONNECTION ELEMENTS TO BRING SAID ROD TO INCANDESCENCE BY THE JOULE EFFECT AT A TEMPERATURE EXCEEDING THE MELTING POINT OF SAID CONDUCTIVE METAL AND BELOW THE CORROSION POINT OF SAID REFRACTORY METAL WHEREBY A CONNECTION IS MADE FREE OF THE FORMATION OF INSULATING OXIDES ON THE CONTRACTING SURFACES.