Fusible fire sensing tape formed of metal particles dispersed in a flexible plastic binder

Claim 1

A TEMPERATURE SENSING TAPE, FOR USE IN A HEAT DETECTION SYSTEM, COMPRISING IN COMBINATION: (A) AN ELONGATED, DIMENSIONALLY STABLE, ELECTRICALLY NON-CONDUCTIVE, SYNTHETIC PLASTIC SHEET CARRIER OF SLIGHT THICKNESS; (I) SAID CARRIER BEING COMPOSED TO BE DESTRUCTIBLE BY HEAT IN THE TEMPERATURE RANGE OF FROM ABOUT 175*F. TO ABOUT 550*F.; (B) SUPERIMPOSED ON SAID CARRIER A SLENDER, THIN, FLEXIBLE STRIPE OF ELECTRICALLY CONDUCTIVE-LOW RESISTIVITY METALLIC MATERIAL, (I) SAID METALLIC MATERIAL BEING COMPOSED OF FINELY DIVIDED PARTICLES OF A LOW RESISTANCE HIGHTEMPERATURE-FUSING METAL DISPERSED IN A SOLID FLEXIBLE PLASTIC BINDER; (II) SAID BINDER BEING COMPOSED TO BE DESTRUCTIBLE BY HEAT IN THE RANGE OF FROM ABOUT 175*F. TO ABOUT 550*F. (III) SAID STRIP BEING NARROWER THAN SAID CARRIER, AND BEING ADHERENT TO AN EXPOSED FACE OF SAID CARRIER, AND EXTENDING CONTINUOUSLY ALONG THE LENGTH OF SAID CARRIER, (C) WHEREBY THE INDICATED DEGREE OF HEAT APPLIED EXTERNALLY TO SAID TAPE ACTS UPON SAID CARRIER SO THAT IT NO LONGER PROPERLY SUPPORTS SAID STRIP, AND ACTS ON SAID STRIPE CAUSING IT TO PART SO AS TO INTERRUPT AN ELECTRICAL CIRCUIT.