Patent US4566289A successfully refreshed from Google Patents.
US3748422A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Induction coil for induction heating of moving articles
Assignee: Siemens AG
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Filing: 1972-11-30
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Granted: 1973-07-24
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Expires: 1992-11-30
Abstract
Abstract An induction coil for induction heating and joining of moving articles and materials, particularly for heat sealing nonmetallic containers with closures containing metal foil and thermoplastic material. The induction coil consists of two or more turns of an electrically conducting tube which can be cooled by a coolant flowing through it. The coil is provided at two opposite end sections with means for attenuating the alternating magnetic field in the vicinity of these sections, which is normally generated by the flow of alternating current. At each of the two end sections at least one turn of the coil is enclosed by a sleeve of metal of such wall thickness that the sleeve is substantially impervious to the alternating magnetic field of the enclosed turn, and each sleeve is connected with a single turn of the coil in an electrically and thermally conducting manner.
Inventors
- 👤 H Schafer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 05:41
CPC Classifications
H; H05; H05B; H05B6/00; H05B6/02; H05B6/36; H05B6/365; H05B6/10; H05B6/101; H05B6/103
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
121 words
An induction coil assembly for induction heating and joining moving articles and materials, particularly for the induction sealing of moving containers with a foil, comprising a plurality of turns of an electrically conducting tubing adapted to be cooled by a coolant that flows through it, said assembly being provided at its two opposite end sections with means for attenuating the alternating magnetic field in the vicinity of said sections which is generated by the passage of ac current therethrough, said means each including a metallic sleeve member enclosing at least one turn of said tubing at the respective end section and being of such wall thickness that the sleeve is substantially impervious to the alternating magnetic field of the enclosed turn.
Claim 2
Dependent Claim
121 words
An induction coil assembly for induction heating and joining moving articles and materials, particularly for the induction sealing of moving containers with a foil, comprising a plurality of turns of an electrically conducting tubing adapted to be cooled by a coolant that flows through it, said assembly being provided at its two opposite end sections with means for attenuating the alternating magnetic field in the vicinity of said sections which is generated by the passage of ac current therethrough, said means each including a metallic sleeve member enclosing at least one turn of said tubing at the respective end section and being of such wall thickness that the sleeve is substantially impervious to the alternating magnetic field of the enclosed turn.
Claim 3
Dependent Claim
31 words
In an induction coil assembly according to claim 1, each said sleeve being connected to one of said turns at the respective end section in an electrically and thermally conducting manner.
Claim 4
Dependent Claim
48 words
In an induction coil assembly according to claim 1, at least one turn of said tubing being enclosed by its respective sleeve, and at least another one of the turns being disposed on the outside of said sleeve and connected thereto in an electrically and thermally conducting manner.
Claim 5
Dependent Claim
40 words
In an induction coil assembly according to claim 1, at least two turns of said tubing being enclosed by its respective sleeve and said sleeve being connected with one of said enclosed turns in an electrically and thermally conducting manner.
Claim 6
Dependent Claim
40 words
In an induction coil assembly according to claim 1, at least one of said turns is disposed externally of its respective sleeve and is displaced vertically relative to the main plane of the coil in the vicinity of said sleeve.
Claim 7
Dependent Claim
27 words
In an induction coil assembly according to claim 1, each said sleeve being composed of a material selected from the group consisting of copper, brass or aluminum.
Claim 8
Dependent Claim
20 words
In an induction coil assembly according to claim 1, each said sleeve being a tubular enclosure of oval cross section.
Claim 9
Dependent Claim
22 words
In an induction coil assembly according to claim 1, the free interior space of each said sleeve being filled with insulating material.
Claim 10
Dependent Claim
23 words
In an induction Coil assembly according to claim 1, said assembly being cast together with said sleeves into a frame of plastic material.
Claim 11
Dependent Claim
23 words
In an induction coil assembly according to claim 1, said assembly being cast together with said sleeves into a plate of plastic material.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-23 | 1977-01-22 | 1977-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-23 | 1981-01-22 | 1981-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-23 | 1985-01-22 | 1985-07-24 | $7700.00 | Window Closed / Lapsed |