Patent US3969657A successfully refreshed from Google Patents.
US3969657A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetizing and demagnetizing electrical circuit
Assignee: Deutsche Edelstahlwerke AG
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Filing: 1975-02-06
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Granted: 1976-07-13
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Expires: 1995-02-06
Abstract
Abstract An appliance for magnetizing and demagnetizing permanent magnets, incorporating an electrical circuit arrangement consisting essentially of at least one chargeable condenser, a magnetizing and demagnetizing coil, an electronic switch, and wherein a diode is arranged in parallel to the said condenser, and two switch means are provided for optionally connecting the said diode to the one or the other end of the said coil.
Inventors
- 👤 Dieter Oettinghaus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:50
CPC Classifications
H; H01; H01F; H01F13/00; H01F13/003
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
75 words
A circuit arrangement for magnetizing and demagnetizing permanent magnets comprising: a condenser; means for charging the condenser; a magnetizing and demagnetizing coil; electronic switch means joined to the coil for selectively connecting said coil across the condenser; a diode; additional switch means selectively connected to one end of the coil for connecting said diode across the condenser and to the other end of the coil for connecting the coil and the diode across the condenser.
Claim 2
Dependent Claim
75 words
A circuit arrangement for magnetizing and demagnetizing permanent magnets comprising: a condenser; means for charging the condenser; a magnetizing and demagnetizing coil; electronic switch means joined to the coil for selectively connecting said coil across the condenser; a diode; additional switch means selectively connected to one end of the coil for connecting said diode across the condenser and to the other end of the coil for connecting the coil and the diode across the condenser.
Claim 3
Dependent Claim
16 words
An appliance according to claim 1, wherein the said electronic switch is a silicon controlled rectifier.
References Cited (Backward Citations)
US3064165A
Cited
US3708726A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-07-13 | 1980-01-12 | 1980-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-07-13 | 1984-01-12 | 1984-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-07-13 | 1988-01-12 | 1988-07-13 | $7700.00 | Window Closed / Lapsed |