 Preheater device for hot water heaters |
| OF THE INVENTION Water heater 10 is of conventional construction and does not per se form a part ... |
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| System for use with solar collector |
| This invention features a system for use with a solar collector, comprising a water storage tank, a ... |
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| Heat exchanger support construction |
| In order to overcome the aforementioned disadvantage of unbalanced fluid pressure forces acting on ... |
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| Solar collectors |
| The present invention is directed particularly to the latter type of solar collector but provides a ... |
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| Graded pore size heat pipe wick |
| A uniform pore-size wick has an optimum pore-size equal to twice the gravitational head. A graded ... |
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| Solar energy operated motor apparatus |
| What is claimed is: 1. A motor apparatus comprising: (a) a plurality of containers having solar ... |
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| Tandem master cylinder assembly |
| What is claimed is: 1. A tandem master cylinder assembly for use in split front and rear brake ... |
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| Turning collectors for solar radiation |
| Referring to FIGS. 1 through 4, there is shown a simple, durable mechanism for turning a solar ... |
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| Fireplace enclosure |
| I claim: 1. A fireplace enclosure, comprising in combination: a. a frame having substantially ... |
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Electrical heating device
| Details |
Inventors: Grise, Frederick G. J.;
Assignee: Flexwatt Corporation (Canton, MA)
Primary Examiner: Goldberg; E. A.
Assistant Examiner: Lateef; M. M.
Attorney, Agent or Firm:
An electrical heating device comprises a substrate, a pair of parallel, spaced apart elongated conductors extending longitudinally of the substrate, and a semi-conductor pattern carried on the substrate and electrically connected to and extending between the conductors. The semi-conductor pattern produces a thermal image for an infrared target. In some embodiments, the thermal image is irregular or circular in shape and the semi-conductor pattern includes a plurality of transversely-spaced bars having relatively wide portions outside, and relatively thin portions within, the area producing the thermal image. |
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DETAILED DESCRIPTION Referring to FIGS.
1-6 there is shown an infrared imaging target, designed to produce a thermal image similar to that produced by a real tank.
As shown, the target, generally designated 2, includes eleven heat-producing target portions, of varying size, shape and configuration mounted on a plywood support.
Target portions 4 and 5 are generally rectangular and, as shown, are designed to form images corresponding, respectively, to the tank gun and engine.
Target portion 6 is generally trapezoidal and forms an image corresponding to that of the tank turret.
In practice, the sections of target portion 6 shown in dashed lines are folded back to produce a more accurate overall image.
Target portion 8, in the shape of a circular segment, is positioned on top of target portion 6 and forms an image corresponding to that of the hatch on top of the turret.
Finally, target portions 10a through 10g each form an image corresponding to one of the tank wheels.
Target portion 4 is shown in detail in FIG.
3.
One of target portions 10 is shown in detail in FIG.
5.
As shown most clearly in FIGS.
3, 4 and 5, each of target portions 4, 6, 8 comprises a plastic substrate 12, on which a semi-conductor pattern 16 of colloidal graphite is printed.
Substrate 12 is 0.
003 inch think polyester ("Mylar"), corona discharge treated on the side thereof on which the semi-conductor is to be printed.
The semi-conductor pattern includes a pair of parallel longitudinal stripes 18, each 5/32 inch wide and spaced 24 inches apart.
The area between stripes 18, except for a 3/8 inch wide strip along the inside edge of each stripe, is coated with a dielectric, thermally-conductive non-glare solvent, carrier polyester material (obtained from Amicon Corp.
of Lexington, Mass.
).
It should be noted that the dielectric coating affects the resistivity (ohms) space of the semi-conductor pattern, typically increasing it by about 42%.
It will thus be seen that the resistivity of the coated portion of the semi-conductive pattern (e
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Heat Accumulators 
