Patent US4352008A successfully refreshed from Google Patents.
US4352008A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric heating device for heating the interior of a switch cabinet
Assignee: Eichenauer Heizelemente GmbH and Co KG
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Filing: 1979-12-31
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Granted: 1982-09-28
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Expires: 1999-12-31
Abstract
Abstract An electric heating device for heating the interior of a cabinet containing electrical apparatus, such as a switch or distribution apparatus, to prevent sweating or condensation therein, includes at least one PTC electrical resistance heating and temperature self-regulating heating element situated in the interior of an elongated body made of thermally conductive material that is thermally connected to a radiator. The radiator is formed by a pair of flat base plates extending laterally from opposite sides of the body and radiator fins extending only from the base plates and only from one flat side thereof. The body is a massive hollow element having a wall thickness greater than that of the base plates and fins and a height greater than the thickness of the base plates. The body, base plates and fins are formed as a one piece extrusion. A permanent magnet may be used to secure the body to the interior surface of a steel cabinet.
Inventors
- 👤 Edwin Hofer
- 👤 Helmut Ohnmacht
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:46
CPC Classifications
H; H05; H05B; H05B3/00; H05B3/40; H05B3/42; H05B3/48; H05B3/50; H02; H02B; H02B1/00; H02B1/56; H02B1/565
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
136 words
A heating device for warming the interior of a cabinet containing electrical apparatus, said heating device comprising at least one PTC electrical resistance heating and temperature regulating device which is situated in the interior of a body made of thermally conductive material that is connected in a thermally conductive manner to a radiator, said radiator comprising a pair of flat base plates projecting from opposite sides of said body and radiator fins extending only from said base plates and only outwardly from one flat side thereof, wherein said body is a massive hollow element having a wall thickness greater than that of said base plates and fins and a height substantially greater than the wall thickness of said base plates, and wherein said body, base plates and fins are unitarily formed as a one piece extrusion.
Claim 2
Dependent Claim
136 words
A heating device for warming the interior of a cabinet containing electrical apparatus, said heating device comprising at least one PTC electrical resistance heating and temperature regulating device which is situated in the interior of a body made of thermally conductive material that is connected in a thermally conductive manner to a radiator, said radiator comprising a pair of flat base plates projecting from opposite sides of said body and radiator fins extending only from said base plates and only outwardly from one flat side thereof, wherein said body is a massive hollow element having a wall thickness greater than that of said base plates and fins and a height substantially greater than the wall thickness of said base plates, and wherein said body, base plates and fins are unitarily formed as a one piece extrusion.
Claim 3
Dependent Claim
61 words
A heating device according to claim 1, wherein said massive hollow element is elongated, said flat base plates are connected along the length of said opposite sides so as to extend from the center thereof in a common plane extending laterally of said massive hollow element, and said fins extend lengthwise along said base plates parallel to said massive hollow element.
Claim 4
Dependent Claim
39 words
A heating device according to claim 1 or 2, wherein said body projects from said base plate on a side opposite to the radiator fins, and wherein a securing element is attached to said body at said opposite side.
Claim 5
Dependent Claim
14 words
A heating device according to claim 3, wherein said securing element is a magnet.
Claim 6
Dependent Claim
14 words
A heating device according to claim 1, wherein said massive hollow element is elongated.
Claim 7
Dependent Claim
25 words
A heating device according to claim 1, wherein said PTC element is cemented into a cavity within said massive hollow element with thermally conductive cement.
Claim 8
Dependent Claim
30 words
A heating device according to claim 1, wherein said massive hollow element has a cavity that is open only at one end and within which said PTC element is situated.
Claim 9
Dependent Claim
17 words
A heating device according to claim 1, wherein said fins are inclined relative to said base plate.
References Cited (Backward Citations)
CA704047A
Cited
GB219497A
Cited
US1660218A
Cited
US1884585A
Cited
CH224916A
Cited
US2683209A
Cited
US2861163A
Cited
FR71739E
Cited
US3243753A
Cited
US3194944A
Cited
US3338476A
Cited
US3396458A
Cited
US3564199A
Cited
US3748439A
Cited
GB1408765A
Cited
US3824328A
Cited
DE7323567U
Cited
GB1480833A
Cited
US3940591A
Cited
GB1501918A
Cited
DE2525367A1
Cited
DE2531692A1
Cited
US4091267A
Cited
DE2855645A1
Cited
DE2832959A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-09-27 | 1986-03-29 | 1986-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-09-27 | 1990-03-29 | 1990-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-09-27 | 1994-03-29 | 1994-09-28 | $7700.00 | Window Closed / Lapsed |