Patent US3725630A successfully refreshed from Google Patents.
US3725630A
Expired / Lapsed
US
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Inductive coil for heating a loop of conductive material
Assignee: PILLAR INDUSTRIES Inc
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Filing: 1971-12-20
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Granted: 1973-04-03
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Expires: 1991-12-20
Abstract
Abstract An induction coil is provided for heating a loop of conductive material, the coil having first and second concentric closed inductive loops of different sizes to receive the loop of conductive material between them. Input leads are connected to the respective inductive loops and a jumper connects points on the inductive loops that are substantially at mid-positions respectively about the periphery of the associated inductive loops relative to the point of connection of one of the input leads. This provides a structure wherein current will flow through the loops in series and in opposite directions to provide uniform heating throughout a closed loop of conductive material.
Inventors
- 👤 N Gagliardi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:39
CPC Classifications
H; H05; H05B; H05B6/00; H05B6/02; H05B6/36; H05B6/362; B; B29; B29C; B29C65/00; B29C65/02; B29C65/34; B29C65/36; B29C65/3604; B29C65/3608; B29C65/362; B29C65/3668; B29C65/3672; B29C65/3676; B29C65/368; B29C66/00; B29C66/01; B29C66/05; B29C66/10; B29C66/12; B29C66/124; B29C66/1244; B29C66/12441; B29C66/1246; B29C66/12461; B29C66/20; B29C66/24; B29C66/242; B29C66/2422; B29C66/24221; B29C66/50; B29C66/51; B29C66/54; B29C66/542; B29L; B29L2031/00; B29L2031/712
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
97 words
An induction coil for heating a closed loop of conducting material wherein the improvement comprises, a. first and second concentric closed inductive loops formed relatively larger and smaller in their periphery than a closed complementary Loop of conducting material to be heated, b. leads for connection to a source of power connected to the respective inductive loops, and c. a jumper connecting points on the inductive loops that are substantially at mid-positions respectively about the periphery of the associated inductive loop relative to the point of connection of one of the leads to the associated inductive loop.
Claim 2
Dependent Claim
97 words
An induction coil for heating a closed loop of conducting material wherein the improvement comprises, a. first and second concentric closed inductive loops formed relatively larger and smaller in their periphery than a closed complementary Loop of conducting material to be heated, b. leads for connection to a source of power connected to the respective inductive loops, and c. a jumper connecting points on the inductive loops that are substantially at mid-positions respectively about the periphery of the associated inductive loop relative to the point of connection of one of the leads to the associated inductive loop.
Claim 3
Dependent Claim
93 words
An induction coil according to claim 1 wherein the concentric inductive loops are disposed substantially in the same plane and have an area between the outer periphery of the inner loop and the inner periphery of the outer loop for heating a loop of conducting material that may be inserted between the inductive loops, whereby upon energization of the leads from a suitable source of high frequency, current will flow in opposite directions throughout the closed loops to concentrate a magnetic field created by the current flow throughout the loop of conducting material.
Claim 4
Dependent Claim
30 words
An induction coil according to claim 1 wherein the inductive loops, leads and jumpers are of hollow conducting material to permit passage of cooling fluid through the loops in series.
References Cited (Backward Citations)
US3651299A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-02 | 1976-10-02 | 1977-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-02 | 1980-10-02 | 1981-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-02 | 1984-10-02 | 1985-04-03 | $7700.00 | Window Closed / Lapsed |