Electric heating – Heating devices – Combined with diverse-type art device
Reexamination Certificate
2000-03-22
2001-02-27
Hoang, Tu Ba (Department: 3742)
Electric heating
Heating devices
Combined with diverse-type art device
C219S520000, C126S271100
Reexamination Certificate
active
06194686
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates generally to ground thawing devices and more specifically it relates to a portable ground thawing panel system for thawing an area of frozen ground to allow digging in the wintertime.
2. Description of the Prior Art
Ground heating devices have been in use for years. Typically, a heating devices utilized to thaw frozen ground circulate a heated fluid such as water or air to transfer heat to the frozen ground thereby thawing the frozen ground to allow digging and other ground work to occur.
Conventional ground heating devices require a significant heat source to the heat the fluid along with pumps to circulate the heated fluid about tubing or other structure. Conventional ground heating devices are complicated. to utilize and are difficult to repair when damaged.
Examples of patented heating devices include U.S. Pat. No. 5,820,301 to Bruckelmyer; U.S. Pat. No. 5,441,038 to Ohmann; U.S. Pat. No. 3,868,825 to Boyce; U.S. Pat. No. 5,033,452 to Carriere; U.S. Pat. No. 5,964,402 to Jakobson; U.S. Pat. No. 3,132,642 to Fingland which are all illustrative of such prior art.
While these devices may be suitable for the particular purpose to which they address, they are not as suitable for thawing an area of frozen ground to allow digging in the wintertime. Conventional ground thawing devices are bulky and difficult to utilize.
In these respects, the portable ground thawing panel system according to the present invention substantially departs from the conventional concepts and designs of the prior art, and in so doing provides an apparatus primarily developed for the purpose of thawing an area of frozen ground to allow digging in the wintertime.
SUMMARY OF THE INVENTION
In view of the foregoing disadvantages inherent in the known types of thawing devices now present in the prior art, the present invention provides a new portable ground thawing panel system construction wherein the same can be utilized for thawing an area of frozen ground to allow digging in the wintertime.
The general purpose of the present invention, which will be described subsequently in greater detail, is to provide a new portable ground thawing panel system that has many of the advantages of the ground thawing devices mentioned heretofore and many novel features that result in a new portable ground thawing panel system which is not anticipated, rendered obvious, suggested, or even implied by any of the prior art thawing devices, either alone or in any combination thereof.
To attain this, the present invention generally comprises an upper member, a plurality of outer member secured to the upper member, a layer of insulation adjacent the upper member, a divider member adjacent the insulation opposite the upper member, and an electrical heating element secured to the divider member opposite of the insulation. The heating element may be temperature self-regulating or a thermostat may be electrically connected to the heating element.
There has thus been outlined, rather broadly, the more important features of the invention in order that the detailed description thereof may be better understood, and in order that the present contribution to the art may be better appreciated. There are additional features of the invention that will be described hereinafter and that will form the subject matter of the claims appended hereto.
In this respect, before explaining at least one embodiment of the invention in detail, it is to be understood that the invention is not limited in its application to the details of construction and to the arrangements of the components set forth in the following description or illustrated in the drawings. The invention is capable of other embodiments and of being practiced and carried out in various ways. Also, it is to be understood that the phraseology and terminology employed herein are for the purpose of the description and should not be regarded as limiting.
A primary object of the present invention is to provide a portable ground thawing panel system that will overcome the shortcomings of the prior art devices.
A second object is to provide a portable ground thawing panel system for thawing an area of frozen ground to allow digging in the wintertime.
Another object is to provide a portable ground thawing panel system that efficiently thaws frozen ground.
An additional object is to provide a portable ground thawing panel system that is easy and simple to utilize.
A further object is to provide a portable ground thawing panel system that does not require a fuel source such as propane or a circulating pump.
Another object is to provide a portable ground thawing panel system that is portable.
Other objects and advantages of the present invention will become obvious to the reader and it is intended that these objects and advantages are within the scope of the present invention.
To the accomplishment of the above and related objects, this invention may be embodied in the form illustrated in the accompanying drawings, attention being called to the fact, however, that the drawings are illustrative only, and that changes may be made in the specific construction illustrated and described within the scope of the appended claims.
REFERENCES:
patent: 3132642 (1964-05-01), Fingland
patent: 3303324 (1967-02-01), Appleman
patent: 3479490 (1969-11-01), Stark
patent: 3868825 (1975-03-01), Boyce
patent: 3936661 (1976-02-01), Furuishi et al.
patent: 3961157 (1976-06-01), Miller et al.
patent: 5033452 (1991-07-01), Carriere
patent: 5371340 (1994-12-01), Stanfield
patent: 5387778 (1995-02-01), Stanger
patent: 5441038 (1995-08-01), Ohmann
patent: 5820301 (1998-10-01), Bruckelmyer
patent: 5964402 (1999-10-01), Jakobson
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