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Low thermal mass solid plate surface heating unit

  • US 3,895,216 A
  • Filed: 09/30/1974
  • Issued: 07/15/1975
  • Est. Priority Date: 09/30/1974
  • Status: Expired due to Term
First Claim
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1. A LOW THERMAL MASS SOLID PLATE SURFACE HEATING UNIT COMPRISING A TIN PLATE OF COMPOSITE SHEET MATERIAL WITH A CORE OF HIGH THERMAL CONDUCTIVITY SELECTED FROM A GROUP COMPRISING COPPER SILVER AND ALUMINUM, AND TOP AND BOTTOM LAYERS SELECTED FROM A GROUP COMPRISING STAINLESS STEEL, NICKLE AND CHROMIUM, AND LOW CARBON STEEL, SAID TOP AND BOTTOM LAYERS SERVING TO REINFORCE THE CORE AND RESTRICT ITS OXIDATION AND CORROSION, AN INSULATION LAYER OF HIGH ELECTRICAL RESISTIVITY SUBSTANTIALLY COVERING THE BOTTOM LAYER OF THE COMPOSITION PLATE, AND A FILM HEATER OF DOUBLE SPIRAL FORM BONDED TO THE INSULATING LAYER AND SERVING AS AN ELECTRICAL RESISTANCE HEATING ELEMENT, AND ELECTRICAL TERMINAL MEANS COPERATING WITH THE COMPOSITE PLATE AND ELECTRICALLY CONNECTED TO THE FILM HEATER AND ADAPTED TO CONNECT THE SURFACE HEATING UNIT IN A POWDER CIRCUIT TO PROVIDE A LOW ENERGY UNIT OF HIGHEST THEMAL EFFICIENCY, SAID ELECTRICAL TERMINAL MEANS BEING LOCATED ADJACENT THE CENTER OF THE DOUBLE SPIRAL FILM HEATER PATTERN TO CREATE A GENERALLY UNIFORM CIRCULAR HEATING PATTERN BENEATH THE COMPOSITE PLATE.

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