Elimination of potentially harmful electrical and magnetic field

Details Elimination of potentially harmful electrical and magnetic field Elimination of potentially harmful electrical and magnetic field

1989-10-11

1993-06-08

Walberg, Teresa J.

Electric heating

Heating devices

With heater-unit housing, casing, or support means

219212, H05B 334

Patent

active

052181855

ABSTRACT:
Diverse methods for eliminating potentially harmful periodically varying electrical and magnetic fields which emanate from electric blankets, heating pads, and other electrical appliances intended for use proximate to the human body. One approach entails the use of a self-shielding coaxial cable as the heating element with core and sheath connected electrically in flux-cancelling fashion to minimize emanated magnetic and electrical fields. Another approach involves the use of heating elements, may otherwise be of currently conventional construction, powered with filtered dc to avoid potentially harmful alternating fields and produce harmless stationary fields instead. Ground integrity assurance means are also provided to avoid the emanation from the blanket or appliance of alternating electric fields which might otherwise result from connection to an improperly polarized alternating current source.

REFERENCES:
patent: 1972720 (1934-09-01), Tarpley
patent: 2344820 (1944-03-01), Kearsley
patent: 3373262 (1968-03-01), Howell
patent: 4095228 (1978-06-01), Meinke
patent: 4908497 (1990-03-01), Hjortsberg
Holt, Charles A., Electronic Circuits, .COPYRGT.1978 pp. 812-815.
N.Y. Times, "Scientists Debate Health Hazards . . . ", Jul. 1989.

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