Corrosion proof shielding tape for shielding telephone cables

Claim 1

AN ELECTRIC CABLE COMPRISING A CORE INCLUDING INSULATED CONDUCTOR MEANS, A LAMINATED SHIELD COMPLETELY SURROUNDING THE CIRCUMFERENCE OF THE CORE AND COMPRISING A METAL STRIP AND PLASTIC LAMINATE COVERING THE INNER AND OUTER SURFACES OF THE STRIP, EACH OF THE PLASTIC LAMINATES BEING BONDED TO THE STRIP WITHOUT USE OF INTERMEDIATE ADHESIVE LAYERS AND WITH THE BOND IN THE METAL BEING ACHIEVED BY THE PRESENCE OF CARBOXYL GROUPS IN THE SAID FILM TO OBTAIN A CHEMICAL BOND THAT MAINTAINS THE BOND IN THE PRESENCE OF A MOIST COROSIVE ATMOSPHERE THAT DETERIORATES THE METAL OF THE STRIP AND IN THE PRESENCE OF LIQUID THAT CORRODES THE METAL OF THE STRIP WHEREBY CORROSIVE ATMOSPHERE AND LIQUID THAT REACHES THE STRIP THROUGH A PUNCTURE IN THE SHIELD PROGRESSES ONLY EDGEWISE FROM THE PUNCTURE OVER AN EXPOSURE AREA EQUAL TO THE PRODUCT OF THE PUNCTURE PERIMETER TIMES THE THICKNESS OF THE STRIP, AND AN OUTER JACKET OF INSULATION OVER THE OUTSIDE OF THE SHIELD AND HAVING ANY ADHERENCE TO THE OUTER LAMINATE OF THE SHIELD SUBSTANTIALLY LESS THAN THE BONDING OF THE LAMINATE TO THE STRIP.