Production of composite metal sheet or strip

Claim 1

A METHOD OF MAKING A COMPOSITE INLAY METAL SHEET OR STRIP WHICH COMPRISES LIGHTLY ADHERING AT LEAST ONE STRIP ELEMENT OF METALLIC MATERIAL SELECTED FROM THE GROUP CONSISTING OF PLATINUM METAL AND ALLOYS OF PLATINUM WITH AT LEAST ONE OTHER PLATINUM GROUP METAL TO AT LEAST ONE FACE OF A BASE ELEMENT OF REFRACTORY METAL SELECTED FROM THE GROUP CONSISTING OF TITANIUM, TANTALUM, NIOBIUM, VANADIUM, ZIRCONIUM TO FORM A COMPOSITE BI-METAL ASSEMBLY WITH SAID STRIP ELEMENT LYING SUPERIMPOSED ON SAID BASE ELEMENT, ENCASING SAID ASSEMBLY IN A METALLIC SHEATH WHILE LOCATING A STOP-WELD MATERIAL BETWEEN AT LEAST SAID STRIP AND SAID SHEATH, HEATING SAID BI-METAL ASSEMBLY TO A TEMPERATURE WITHIN THE RANGE OF 800-950*C. AND APPLYING PRESSURE WITHIN THE RANGE FROM 1/2 TO 5 TONS/SQ. IN. TO THE HEATED ASSEMBLY SIMULTANEOUSLY AND UNIFORMLY THROUGHOUT THE WHOLE AREA OF MUTUAL CONTACT OF THE CONSTITUENT ELEMENTS THEREOF, WHEREBY SAID STRIP ELEMENT IS FORCED CLEANLY INTO THE MATERIAL OF SAID BASE ELEMENT AND SAID ELEMENTS ARE INTIMATELY BONDED TO ONE ANOTHER IN MUTUALLY FLUSH AND ACCURATELY DELINEATED RELATIONSHIP.