Patent ID: 7047626
Filing Date: 2006-05-23
Classification: H01C,Y10T

Abstract:
1. Method of making an encapsulated electrically resistive heater, said method comprising: (a) providing a mold having a cavity therein, (b) centrally positioning an electrically resistive heating element in said cavity, (c) said cavity having a length and width greater than the length and width of said electrically resistive heating element, thereby to provide a space between said cavity and said electrically resistive heating element, said space extending completely around the sides of said electrically resistive heating element (d) said electrically resistive heating element having a first face and a second face opposite said first face, (e) said second face contacting the bottom of said cavity, (f) applying a first thermosetting molding compound to said first face of said electrically resistive heating element, (g) forcing a press into said mold against said first thermosetting molding compound, thereby to force said first thermosetting molding compound against the first face of said electrically resistive heating element and into said space, (h) allowing said first thermosetting molding compound to cross-link, (i) removing said electrically resistive heating element from said mold, reversing said electrically resistive heating element and reinserting said electrically resistive heating element into said cavity, said first thermosetting molding compound contacting the bottom of said cavity, (j) securing electrodes to said second face of said electrically resistive heating element, (k) applying a second thermosetting molding compound to said second face of said electrically resistive heating element, (l) forcing a press into said mold against said second thermosetting molding compound thereby to force said second thermosetting molding compound against the second face of said electrically resistive heating element and into contact with said first thermosetting molding compound in said space, (m) allowing said second thermosetting molding compound to cross-link, (n) removing the now-formed encapsulated electrically resistive heating element from said mold, (o) removing a portion of said encapsulation from around the ends of said electrodes to permit connection to a source of electricity.