Electric heater plate and terminal thereof

• US 3,895,218 A
• Filed: 05/02/1974
• Issued: 07/15/1975
• Est. Priority Date: 05/02/1974
• Status: Expired due to Term

• Current Assignee: William C. Cooke
• Original Assignee: William C. Cooke
• Inventors: Cooke, William C.
• Primary Examiner(s): Mayewsky, Volodymyr Y.
• Application Number:
  US05/466,466
• Time in Patent Office: 439 Days
• Field of Search: 219/203,522,543,549 117/211,212 174/68.5 338/308,309
• US Class Current: 219/543
• CPC Class Codes: H05B 3/06 Heater elements structurally combined with coupling elements or holders
• CPC Class Codes: H05B 3/265 the insulating base being an inorganic material, e.g. ceramic H05B3/262 takes precedence

Abstract

An electric heater plate is disclosed comprising a sheet of tempered glass with a metallized aluminum circuit extending over the face thereof for carrying an electrical heating current. At the terminals of the metallized aluminum circuit there is provided a terminal area of silver between the glass and the metallized aluminum coating, which silver terminals are each exposed through a small opening in the metallized aluminum coating such that lead wires may be soldered to the silver through said openings.

Claims

1. An electric heater plate comprising a sheet of tempered glass, at least a pair of terminal areas on one face of said glass sheet and a terminal member formed of a layer of silver bonded to said glass sheet within each terminal area, an electrically conductive heating circuit of aluminum extending in a pattern over said one face and including a terminal disposed over each terminal area to cover completely said terminal member, said heating circuit bonded both to said one face of said glass sheet and to each terminal member and in electrical contact with the latter, and an opening in each terminal of said heating circuit at said terminal areas through to each terminal member for exposing a portion of each underlying terminal member whereby said electric heater plate is adapted for electrical connection in an external circuit.

2. The electric heater plate of claim 1 wherein said heating circuit is formed by a grid connecting said terminals.

3. The electric heater plate of claim 1 including a coating of heat resistant lacquer overlying at least the silver exposed through said opening whereby to protect said silver from atmospheric corrosion.

4. The electric heater plate of claim 3 in which said coating extends over substantially the entire surface of said plate including the heating circuit and the exposed glass sheet.

5. The electric heater plate of claim 4 in which the portion of said heater circuit overlying said silver layer has a minimum dimension parallel to the plane of said plate of 5/8 inch.

6. The electric heater plate of claim 5 in which the area of said silver layer is substantially equal to that of a square 1/2 inch by 1/2 inch in size.

7. The electric heater plate of claim 6 in which the portion of said aluminum circuit overlying said silver layer has an area substantially equal to that of a rectangle 5/8 inch by 3/4 inch in size.

8. The electric heater plate of claim 7 in which said opening is a circle substantially 3/8 inch in diameter.

9. In an electric heater plate in which an electrically conductive aluminum circuit is bonded to one face of a sheet of tempered glass and in which said circuit includes at least a pair of terminal areas for receipt of a lead wire, the improvement in which each terminal area comprises a layer of silver bonded to said one surface of said glass sheet, said aluminum circuit overlies completely, is bonded to and in electric connection with said silver layer, and an opening in said aluminum circuit at said terminal areas exposing said silver layer for receipt of a lead wire whereby said electrically conductive aluminum circuit is adapted for connection in an external circuit.