Patent US4597648A successfully refreshed from Google Patents.
Patent US4575619A successfully refreshed from Google Patents.
US4575619A
Expired / Lapsed
US
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Electrical heating unit with serpentine heating element
Assignee: GENEAL SIGNAL TECHNOLOGY Corp (DE CORP)
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Filing: 1984-05-08
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Granted: 1986-03-11
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Expires: 2004-05-08
Abstract
Abstract A heating unit combining a block of thermal and electrical insulating material and an electrical resistance element in which the block contains a mass of ceramic fibers bound together and has an elongated slot with confronting walls rising to the surface of the block from opposite sides of a land, and the resistance element is in the form of a thin member constructed of a continuous resistance wire which is provided with opposite bends to form a serpentine shape, the bends being embedded in the opposite walls of the block to secure the electrical resistance element on the block, and the resistance element abutting the land of the slot between the walls thereof.
Inventors
- 👤 Ludwig Porzky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 19:10
CPC Classifications
H; H05; H05B; H05B3/00; H05B3/62; H05B3/66; F; F27; F27D; F27D1/00; F27D1/0003; F27D1/0036; H05B3/64
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
120 words
A combination heating and thermal insulating unit for heating a particular region comprising a ceramic fiber thermal insulating block having a surface adapted to confront the region to be heated, said block being constructed of electrical insulating material and having an elongated slot, said slot having walls extending into the block from the surface of the block on opposite sides of the axis of elongation of the slot, an elongated heating element disposed within the slot and engaging the walls of the slot, said heating element having a serpentine electrical conductor extending outwardly on opposite sides of the axis of elongation of the heating element, and said heating element having portions extending through the walls and embedded in the block.
Claim 2
Dependent Claim
120 words
A combination heating and thermal insulating unit for heating a particular region comprising a ceramic fiber thermal insulating block having a surface adapted to confront the region to be heated, said block being constructed of electrical insulating material and having an elongated slot, said slot having walls extending into the block from the surface of the block on opposite sides of the axis of elongation of the slot, an elongated heating element disposed within the slot and engaging the walls of the slot, said heating element having a serpentine electrical conductor extending outwardly on opposite sides of the axis of elongation of the heating element, and said heating element having portions extending through the walls and embedded in the block.
Claim 3
Dependent Claim
163 words
A combination heating and thermal insulating unit comprising the combination of claim 1 wherein the heating element comprises a wire having a first plurality of bends disposed on one side of the axis of elongation of the heating element and a second plurality of bends disposed on the other side of the axis of elongation of the heating element, the bends of the first plurality being electrically connected in series with the bends of the second plurality, the bends of the first plurality engaging one wall of the slot and the bends of the second plurality engaging the other wall of the slot, and at least a portion of the bends of the first plurality being embedded in the block adjacent to the one wall of the slot, and at least a portion of the bends of the second plurality being embedded in the block adjacent to the other wall of the slot, the resistance wire extending from the walls into the slot.
Claim 4
Dependent Claim
34 words
A combination heating and thermal insulating unit comprising the combination of claim 2 wherein each bend of the first plurality of the resistance wire is electrically connected between the bends of the second plurality.
Claim 5
Dependent Claim
41 words
A combination heating and thermal insulating unit comprising the combination of claim 2 wherein the resisting wire has a plurality of interconnecting portions, each interconnecting portion extending from a bend of the first plurality to a bend of the second plurality.
Claim 6
Dependent Claim
26 words
A combination heating and thermal insulating unit comprising the combination of claim 4 wherein the connecting portion between bends of the resistance wire are substantially straight.
Claim 7
Dependent Claim
42 words
A combination heating and thermal insulating unit comprising the combination of claim 5 wherein the axis of elongation of the slot is linear and the interconnecting portions of the wire are disposed between the walls of the slot parallel to each other.
Claim 8
Dependent Claim
49 words
A combination heating and thermal insulating unit comprising the combination of claim 6 wherein the slot has a flat land generally parallel to the surface of the body and extending between the walls of the slot, the interconnecting portions of the wire being disposed in abutment with the land.
Claim 9
Dependent Claim
35 words
A combination heating and thermal insulating unit comprising the combination of claim 6 wherein the bends of the first and second pluralities are disposed on axes parallel to the axis of elongation of the slot.
Claim 10
Dependent Claim
44 words
A combination heating and thermal insulating unit comprising the combination of claim 4 wherein each interconnecting portion of the wire has a bend disposed at a distance from the surface of the block different than the adjacent bends of the first and second pluralities.
Claim 11
Dependent Claim
192 words
A combination heating and thermal insulating unit for heating a particular region comprising a ceramic fiber thermal insulating block having a surface adapted to confront the region to be heated, said block being constructed of electrical insulating material and having a plurality of parallel linear slots, each of said slots having opposed walls extending from the surface therein on opposite sides of the axis thereof and a land extending between the walls thereof, a linear heating element disposed within each slot in abutment with the land thereof, said heating element comprising a resistance wire having a first plurality of bends disposed on one side of the axis of the slot and a second plurality of bends disposed on the other side of the axis of the slot, the bends of the first plurality being connected in series with the bends of the second plurality, at least a portion of the bends of the first plurality being embedded in the block adjacent to one wall of the slot and at least a portion of the bends of the second plurality being embedded in the block adjacent to the other wall of the slot.
Claim 12
Dependent Claim
192 words
A combination heating and thermal insulating unit for heating a particular region comprising a ceramic fiber thermal insulating block having a surface adapted to confront the region to be heated, said block being constructed of electrical insulating material and having a plurality of parallel linear slots, each of said slots having opposed walls extending from the surface therein on opposite sides of the axis thereof and a land extending between the walls thereof, a linear heating element disposed within each slot in abutment with the land thereof, said heating element comprising a resistance wire having a first plurality of bends disposed on one side of the axis of the slot and a second plurality of bends disposed on the other side of the axis of the slot, the bends of the first plurality being connected in series with the bends of the second plurality, at least a portion of the bends of the first plurality being embedded in the block adjacent to one wall of the slot and at least a portion of the bends of the second plurality being embedded in the block adjacent to the other wall of the slot.
Claim 13
Dependent Claim
44 words
A combination heating and thermal insulating unit comprising the combination of claim 10 wherein the wire of each heating element has a plurality of interconnecting portions, each interconnecting portion extending between a bend of the first plurality and a bend of the second plurality.
Claim 14
Dependent Claim
33 words
A combination heating and thermal insulating unit comprising the combination of claim 11 wherein each of the interconnecting portions of the wire is disposed substantially normal to the axis of the heating element.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-03-10 | 1989-09-09 | 1990-03-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-03-10 | 1993-09-09 | 1994-03-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-03-10 | 1997-09-09 | 1998-03-11 | $7700.00 | Window Closed / Lapsed |