US4571472A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for induction welding
Assignee: Akerlund and Rausing AB
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Filing: 1984-12-24
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Granted: 1986-02-18
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Expires: 2004-12-24
Abstract
Abstract A device for induction welding is provided according to the teachings of the present invention. The device comprises an electrically conducting arrangement for creating a magnetic field. A layer comprising essentially non-magnetic, electrically conducting particles in a support matrix of an electrically non-conducting material is also provided and arranged for modifying the magnetic field such that the available energy may be collected in the welding area (areas).
Inventors
- 👤 Zoltan Pollack
- 👤 Bengt Svard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 15:12
CPC Classifications
B; B29; B29C; B29C66/00; B29C66/70; B29C66/72; B29C66/723; B29C66/7232; B29C66/72321; B23; B23K; B23K13/00; B29C65/00; B29C65/02; B29C65/34; B29C65/36; B29C65/3604; B29C65/3608; B29C65/3612; B29C65/3656; B29C65/3672; B29C65/3676; B29C65/368; B29C66/01; B29C66/05; B29C66/20; B29C66/24; B29C66/242; B29C66/2422; B29C66/24221; B29C66/50; B29C66/51; B29C66/54; B29C66/542; B29C66/545; B29C65/3684; B29C65/3696; B29C66/80; B29C66/83; B29C66/832; B29C66/8322; B29K; B29K2995/00; B29K2995/0003; B29K2995/0008
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
133 words
A device for induction welding comprising: conductor means for receiving current from a high frequency source and establishing a magnetic field in a defined area where articles are to be joined by virtue of heat generated in at least a conductive portion of said particles to be joined as a result of said magnetic field, said conductor means being positioned to produce said magnetic field in said defined areas as a result of current flowing therein; and a magnetic field modifying layer positioned intermediate at least portions of said conductor means and said defined area for interacting with said magnetic field and shielding a predetermined region of said defined area, said magnetic field conductive modifying layer taking the form of substantially non-magnetic particles disbursed in a support matrix formed of electrically non-conducting material.
Claim 2
Independent Claim
133 words
A device for induction welding comprising: conductor means for receiving current from a high frequency source and establishing a magnetic field in a defined area where articles are to be joined by virtue of heat generated in at least a conductive portion of said particles to be joined as a result of said magnetic field, said conductor means being positioned to produce said magnetic field in said defined areas as a result of current flowing therein; and a magnetic field modifying layer positioned intermediate at least portions of said conductor means and said defined area for interacting with said magnetic field and shielding a predetermined region of said defined area, said magnetic field conductive modifying layer taking the form of substantially non-magnetic particles disbursed in a support matrix formed of electrically non-conducting material.
Claim 3
Dependent Claim
39 words
The device according to claim 1 wherein said conductor means takes the form of a conductive loop and said magnetic field layer is arranged within said loop for shielding a predetermined region of said defined area underlying said loop.
Claim 4
Dependent Claim
16 words
The device according to claim 2 wherein said support matrix is formed of a mouldable material.
Claim 5
Dependent Claim
28 words
The device according to claim 3 wherein said particles disbursed in said support matrix may be present in an amount of up to approximately 15 percent by weight.
Claim 6
Dependent Claim
21 words
The device according to claim 4 wherein said particles exhibit a size varying from approximately 1 micron to some 10 microns.
Claim 7
Dependent Claim
25 words
The device according to claim 5 wherein said particles may take the form of one of copper dust, carbon black or other electrically conducting material.
Claim 8
Dependent Claim
19 words
The device according to claim 2 wherein said conductor means includes at least a straight section of electric conductor.
Claim 9
Dependent Claim
56 words
The device according to claim 2 wherein said conductor means is disposed upon a non-conductive body defining at least one planar surface, said magnetic field modifying layer is disposed in said non-conductive body parallel to said at least one planar surface and said defined area is adjacent to at least a portion of said planar surface.
Claim 10
Dependent Claim
56 words
The device according to claim 8 wherein said non-conductive body is contoured to receive articles to be joined proximate to said planar surface, to place such articles in a sealing relationship and to subject portions of said articles which are not in a shielded relationship with said magnetic field modifying layer to said magnetic field established.
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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) | 1989-02-17 | 1989-08-19 | 1990-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-02-17 | 1993-08-19 | 1994-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-02-17 | 1997-08-19 | 1998-02-18 | $7700.00 | Window Closed / Lapsed |