US3798759A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making electric heating unit
Assignee: SEG Hausgeraete GmbH
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Filing: 1973-02-15
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Granted: 1974-03-26
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Expires: 1993-02-15
Abstract
Abstract A heating unit for use in heating plates used for cooking, irons, and the like in which a conventional helical heater coil wire is pressed flat to provide a zig-zag, S shaped conductor and then embedded in an embedding compound in the heating unit. Pressing of the helical coils to provide the flat zig-zagging coil permits a more efficient heat transfer, since all of the heating coil will be in a plane parallel to and close to the surface being heated.
Inventors
- 👤 H Gerds
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:55
CPC Classifications
H; H05; H05B; H05B3/00; H05B3/20; H05B3/22; H05B3/28; H05B3/30; H05B3/68; H05B3/688; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49082; Y10T29/49083
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
111 words
A method for manufacturing a heating conductor for use in a heating unit of the type wherein the conductor lies parallel to the heating surface immersed in an embedding compound applied to the other side of the plate which forms the heating surface comprising: a. placing a length of helical conductor wire into a die shaped to provide the final path shape desired in the heating conductor; b. pressing said helical wire in said die to flatten it thereby forming a zig-zag, S shaped heating conductor, the pitch and diameter of the coils of said helical conductor wire being selected so that the turns do not flip over when pressed flat.
Claim 2
Independent Claim
111 words
A method for manufacturing a heating conductor for use in a heating unit of the type wherein the conductor lies parallel to the heating surface immersed in an embedding compound applied to the other side of the plate which forms the heating surface comprising: a. placing a length of helical conductor wire into a die shaped to provide the final path shape desired in the heating conductor; b. pressing said helical wire in said die to flatten it thereby forming a zig-zag, S shaped heating conductor, the pitch and diameter of the coils of said helical conductor wire being selected so that the turns do not flip over when pressed flat.
Claim 3
Dependent Claim
38 words
The invention according to claim 1, and further including the step of removing the pressed conductor from the die by pressing it against an adhesive foil strip and then removing the strip to which the conductor is attached.
Claim 4
Dependent Claim
80 words
The invention according to claim 2 and further including the step of pressing said heating conductor along with the adhesive strip to which it is attached into a first layer of embedding compound, which has been applied to the other side of the heating plate of the heating unit, in such a manner as to cause the heating wire to be just completely immersed in the embedding compound, and, after said embedding compound has set, stripping off said adhesive backing.
Claim 5
Dependent Claim
35 words
The invention according to claim 3 and further including the step of applying a further insulating layer of embedding compound over said first layer and said heating conductors therein after said adhesive strip is removed.
References Cited (Backward Citations)
US2249476A
Cited
US3680207A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-03-25 | 1977-09-24 | 1978-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-25 | 1981-09-24 | 1982-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-25 | 1985-09-24 | 1986-03-26 | $7700.00 | Window Closed / Lapsed |