Electric heating cord with non-heating core-conducting element and reduced EMF emissions

• US 6,002,117 A
• Filed: 03/10/1998
• Issued: 12/14/1999
• Est. Priority Date: 03/10/1998
• Status: Expired due to Fees

• Current Assignee: Il Young Pak
• Original Assignee: Il Young Pak
• Inventors: Pak, Il Young
• Primary Examiner(s): Paschall, Mark
• Assistant Examiner(s): DAHBOUR, HENRY
• Application Number:
  US09/038,359
• Time in Patent Office: 644 Days
• Field of Search: 219/211, 219/212, 219/547, 219/549, 219/527, 219/528, 219/542, 219/543, 219/544, 604/113
• US Class Current: 219/549
• CPC Class Codes: H05B 3/56 Heating cables

Abstract

A heating cord utilizes a non-heating core conductor that is wrapped with a high temperature insulator. The high temperature insulator is wrapped with a heat resistant insulator, wherein the heat resistant insulator is spirally wound with a heat generating wire. Finally, an insulation sheath covers entire embodiment forming a heat-generating cord. The core conductor and the heat generating wire are connected, forming a single electronic circuit wherein the electric current flowing along the core conductor flows in the opposite direction of the electric current flowing along the heat generating wire. As a result, the opposing electromagnetic fields generated by the opposing flows of electric current neutralize each other and function to reduce electromagnetic field emissions generally known to be harmful to humans. The present design allows safe operation well above the approximate 100 watt limitation inherent in designs that utilize resistive, heating-generating core elements.

Claims

1. A heating cord comprising:

a) a non-resistive core conducting element;

(1) wherein said non-resistive core conducting element does not emit heat;

(2) wherein said non-resistive core conducting element is oriented longitudinally within said heating cord;

b) a high temperature insulator wrapped upon said non-resistive core conducting element;

c) a heat resistant insulator wrapped upon said high temperature insulator;

d) a resistive heat generating wire;

(1) wherein said resistive heat generating wire is spirally wound upon said heat resistant insulator;

(2) wherein said resistive heat generating wire is longitudinally wound with respect to said heating cord;

(3) wherein said core conducting element and said resistive heat generating wire are connected to form a single electronic circuit;

(a) wherein when a current is passed through said electronic circuit, said current flowing in said resistive heat generating wire flows in an opposite direction with respect to said current flowing in said core conducting element;

(b) wherein EMF emissions are offset by said current flowing in opposite directions in said resistive heat generating wire and said core conducting element;

e) an insulation sheath wrapped upon said resistive heat generating wire and said heat resistant insulator.