Electric resistance heating devices – Heating devices – Concentrated heated air stream
Reexamination Certificate
1999-12-24
2001-05-01
Walberg, Teresa (Department: 3742)
Electric resistance heating devices
Heating devices
Concentrated heated air stream
C392S384000, C219S225000
Reexamination Certificate
active
06226450
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to an electric field shielding apparatus, and more particularly to consumer electric appliances equipped with electric field shielding apparatus.
2. Discussion of the Related Art
It has been discovered that magnetic and electric fields affect biological matter and, consequently, cause health problems in human. Such health problems may be linked to cancer and other ailments. The electric fields are very common in modem society where consumer electric appliances are frequently used at homes and offices. Commonly, electric field is generated by power lines, transformers and electric motors. The electric blankets or pads which we use to keep warm also generate one or more forms of electric field. Home appliance, such as hair dryer, computer, refrigerator, also causes substantially amount of electric field. In fact, some studies have shown that there may be a direct correlation between electric blankets and certain medical conditions.
As it is well known that the electric field permeates through practically every kind of substances with the exception of conductive or ferromagnetic materials. Thus, attempting to block electric field generated from such appliances as electric blanket, home appliance using ferromagnetic materials may not be practical due to its cost.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide electronic devices having the effect of shielding electric field, preferably by providing conductive wiring therein which is connected to a ground prong of electrical wall receptacles.
Additional features and advantages of the invention will be set forth in the description which follows and in part will be apparent from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
To achieve these and other advantages and in accordance with the purpose of the present invention, as embodied and broadly described, an electric field shielding apparatus used with an electrical device comprises a housing body at least partially surrounding the electrical device; and a conductive shield medium arranged with the shape of the housing body to at least partially surround the electrical device to substantially reflect electric field generated from the electrical device.
According to an aspect of the present invention, the conductive shield medium is a thin conductive layer coated on the interior surface of the housing body. Alternatively, the conductive shield medium is a conductive mesh placed against interior surface of the housing body. In addition, the conductive shield medium may be integrally mixed with the housing body to make the housing body substantially electrically conductive. In other words, the conductive AS shield medium may be in a powder form which is mixed with plastic power, the mixture of which is then heated and poured into an injection mold to form a housing body of an electric device.
To effectively block or absorb the electric field generated from a device, the conductive shield medium is preferably grounded by being connected to a ground prong of a power outlet.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the invention as claimed.
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Dahbour Fadi H.
Lee & Hong
Walberg Teresa
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