Patent US3673465A successfully refreshed from Google Patents.
US3673465A
Expired / Lapsed
US
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Stabilizing magnetic fields
Assignee: Individual
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Filing: 1971-06-24
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Granted: 1972-06-27
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Expires: 1991-06-24
Abstract
Abstract A method and apparatus for automatically stabilizing the magnetic field produced by a coil, the stabilization being effected by connecting between the ends of the coil an electronic device which provides a negative resistance which is equal in magnitude to the resistance of the path over which current flows through the coil, so that the resistance between the coil ends is essentially zero and flux disturbances are automatically compensated by the counterflux induced in the coil by such disturbances.
Inventors
- 👤 Werner Tschopp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:07
CPC Classifications
G; G05; G05F; G05F7/00
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
100 words
A method for stabilizing the magnetic field produced by a coil, in which disturbances in the field enclosed by the coil induce a reaction voltage in the coil, comprising the steps of connecting to the current flow path of the coil electronic means constituting a negative resistance, and giving the negative resistance a magnitude equal to that of the ohmic resistance of the coil current flow path, whereby the resulting voltage across the coil is compensated to approximately zero and such field disturbances are substantially compensated by the opposing field generated by the correction current resulting from the reaction voltage.
Claim 2
Independent Claim
100 words
A method for stabilizing the magnetic field produced by a coil, in which disturbances in the field enclosed by the coil induce a reaction voltage in the coil, comprising the steps of connecting to the current flow path of the coil electronic means constituting a negative resistance, and giving the negative resistance a magnitude equal to that of the ohmic resistance of the coil current flow path, whereby the resulting voltage across the coil is compensated to approximately zero and such field disturbances are substantially compensated by the opposing field generated by the correction current resulting from the reaction voltage.
Claim 3
Dependent Claim
20 words
A method as defined in claim 1 wherein the negative resistance is provided by a positive feedback of an amplifier.
Claim 4
Dependent Claim
83 words
Apparatus for stabilizing the magnetic field produced by a coil, in which disturbances in the field enclosed by the coil induce, in the coil, a reaction current which produces a magnetic field opposing the disturbance, comprising electronic means connected between the ends of said coil and constituting a negative resistance whose magnitude is substantially equal to that of the internal resistance of said coil, whereby the opposing magnetic field produced by said coil in response to a disturbance substantially completely compensates that disturbance
Claim 5
Dependent Claim
83 words
Apparatus for stabilizing the magnetic field produced by a coil, in which disturbances in the field enclosed by the coil induce, in the coil, a reaction current which produces a magnetic field opposing the disturbance, comprising electronic means connected between the ends of said coil and constituting a negative resistance whose magnitude is substantially equal to that of the internal resistance of said coil, whereby the opposing magnetic field produced by said coil in response to a disturbance substantially completely compensates that disturbance
Claim 6
Dependent Claim
21 words
An arrangement as defined in claim 3 wherein said electronic means comprise an amplifier across which a positive feedback is connected.
Claim 7
Dependent Claim
20 words
An arrangement as defined in claim 3 wherein said coil constitutes the only coil utilized for stabilizing the magnetic field.
Claim 8
Dependent Claim
27 words
An arrangement as defined in claim 3, further comprising a current supply source connected to said coil for supplying thereto a current for producing the magnetic field.
Claim 9
Dependent Claim
24 words
An arrangement as defined in claim 3, further comprising an iron core surrounded by said coil and cooperating therewith to produce the magnetic field.
Claim 10
Dependent Claim
40 words
An arrangement as defined in claim 3, further comprising an additional field stabilizing device producing a correction current signal for acting on the same magnetic field, said additional device being connected to deliver its correction current signal to said coil.
Claim 11
Dependent Claim
23 words
An arrangement as defined in claim 8 wherein said additional field stabilizing device operates according to the principle of the nuclear magnetic resonance.
Claim 12
Dependent Claim
21 words
An arrangement as defined in claim 3 wherein there are a plurality of coils connected together for producing the magnetic field.
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) | 1975-06-27 | 1975-12-27 | 1976-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-27 | 1979-12-27 | 1980-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-27 | 1983-12-27 | 1984-06-27 | $7700.00 | Window Closed / Lapsed |