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An electrical heating device comprises a substrate, an elongated conductor extending longitudinally of the substrate, a semi-conductor pattern carried on the substrate and electrically connected to and extending from the conductor pair, and a sealing layer overlying the conductor and sealed to the s

An electrical heating device comprises a substrate, an elongated conductor extending longitudinally of the substrate, a semi-conductor pattern carried on the substrate and electrically connected to and extending from the conductor pair, and a sealing layer overlying the conductor and sealed to the substrate at opposite sides of the conductor. The conductor comprises a pair of rectangular in cross-section metallic conductor elements, placed one on top of the other in face-to-face engagement with and unattached to each other. The bottom conductor elements faces towards the substrate and the upper conductor elements faces towards and engaging the sealing layer. Adjacent one end of the device, the upper conductor elements is folded back longitudinally upon itself to expose an upper surface of the lower conductor element and a lower surface of the upper conductor element, and wherein a wire engages and is electrically connected to the thus exposed upper surface of said lower conductor element and the thus exposed lower surface of said upper conductor element.

대표청구항 ▼

An electrical heating device comprising an elongated conductor, a semi-conductor pattern electrically connected to and extending from said conductor, and electrically insulating sealing layers on top of and below said conductor and said semi-conductor pattern, said device being characterized in that

An electrical heating device comprising an elongated conductor, a semi-conductor pattern electrically connected to and extending from said conductor, and electrically insulating sealing layers on top of and below said conductor and said semi-conductor pattern, said device being characterized in that: said conductor comprises a pair of rectangular in cross-section metallic conductor elements, placed one on top of the other in face-to-face engagement with and unattached to each other, the bottom one of said conductor elements facing towards one of said sealing layers and the upper one of said conductor elements facing towards and engaging the other of said sealing layers, the upper one of said conductor elements adjacent an end of said device is folded back longitudinally upon itself to expose an upper surface of the lower one of said conductor elements and a lower surface of the upper one of said conductor elements, and a wire engages and is electrically connected to at least one of the thus exposed upper surface of said lower one of said conductor elements and the thus exposed lower surface of said upper one of said conductor elements.