US4238752A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetizing device
Assignee: EVVA Sicherheitstechnologie GmbH
•
Filing: 1978-04-10
•
Granted: 1980-12-09
•
Expires: 1998-04-10
Abstract
Abstract A magnetic transformer device includes a cylindrical transformer core, a first winding surrounding the core and a second winding surrounding the first winding. The second winding is formed as a ring-like element with a slot on its upper surface and has a portion located within this slot and extending beyond the upper surface of the second winding. This portion is formed with a cross-section of a size substantially smaller than the size of the slot to produce a magnetic field of high density.
Inventors
- 👤 Hans Lanik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 04:10
CPC Classifications
H; H01; H01F; H01F7/00; H01F7/06; H01F7/20; H01F7/202; H01F13/00
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
86 words
A magnetic transformer device comprising: a cylindrical transformer core; a first winding surrounding said core and a second winding surrounding said first winding, said second winding being formed as a ring-like element with a slot on the upper surface thereof and having at least one portion located within said slot and extending beyond said upper surface, said portion being formed with a cross-section of the size substantially lower than that of said slot to produce a magnetic field of high density for magnetizing a magnet material.
Claim 2
Dependent Claim
86 words
A magnetic transformer device comprising: a cylindrical transformer core; a first winding surrounding said core and a second winding surrounding said first winding, said second winding being formed as a ring-like element with a slot on the upper surface thereof and having at least one portion located within said slot and extending beyond said upper surface, said portion being formed with a cross-section of the size substantially lower than that of said slot to produce a magnetic field of high density for magnetizing a magnet material.
Claim 3
Dependent Claim
21 words
The magnetic transformer device of claim 1, wherein said second winding is a metal tube having said portion formed integral therewith.
Claim 4
Dependent Claim
33 words
The magnetic transformer head of claim 1, further comprising a screen element arranged above said portion, said screen element is formed with a through passing aperture to limit the area to be magnetized.
Claim 5
Dependent Claim
21 words
The magnetic transformer device of claim 3, wherein an insulating element is placed between said screen element and said second winding.
Claim 6
Dependent Claim
20 words
The magnetic transformer of claim 2, wherein said slot is axially projecting along the whole length of said metal tube.
Claim 7
Dependent Claim
41 words
The magnetic transformer device of claim 2, wherein said slot is formed with a central opening with the width exceeding the width of said slot, and said portion of said metal tube is a bar bridging element positioned across said opening.
Claim 8
Dependent Claim
25 words
The magnetic transformer device of claim 6, wherein said opening is a circular aperture and said bar bridging element is positioned excentrically across said aperture.
Claim 9
Dependent Claim
22 words
The magnetic transformer device of claim 6, wherein said bar bridging element has a thickness exceeding the thickness of said metal tube.
Claim 10
Dependent Claim
23 words
The magnetic transformer device of claim 6, wherein said bar bridging element has a thickness equal to the thickness of said metal tube.
Claim 11
Dependent Claim
20 words
The magnetic transformer device of claim 2, wherein said portion of said metal tube is shaped as a truncated cone.
References Cited (Backward Citations)
US2655623A
Cited
US2677019A
Cited
US2838614A
Cited
US2658114A
Cited
US2868889A
Cited
US2901714A
Cited
US3353130A
Cited
US3626344A
Cited
US3758727A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-12-09 | 1984-06-09 | 1984-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-09 | 1988-06-09 | 1988-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-09 | 1992-06-09 | 1992-12-09 | $7700.00 | Window Closed / Lapsed |