US4340770A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Enhancement of the magnetic permeability in glassy metal shielding
Assignee: Honeywell International Inc
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Filing: 1979-09-21
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Granted: 1982-07-20
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Expires: 1999-09-21
Abstract
Abstract An apparatus for shielding a time dependent magnetic field comprises a magnetic metallic glass element in which a magnetic biasing field is generated having higher frequency components than the major components of the time dependent magnetic field.
Inventors
- 👤 Jack E. Bridges
- 👤 Marvin J. Frazier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 06:47
CPC Classifications
H; H05; H05K; H05K9/00; H05K9/0073; H05K9/0075
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
62 words
A method for increasing the magnetic permeability of a magnetic metallic glass shield in a time dependent magnetic field comprising biasing the magnetic metallic glass shield with an electromagnetic field having higher frequency components than the frequency of the major components of the time dependent magnetic field, said biasing field generating induction that is at least about equal to the remanent induction.
Claim 2
Independent Claim
62 words
A method for increasing the magnetic permeability of a magnetic metallic glass shield in a time dependent magnetic field comprising biasing the magnetic metallic glass shield with an electromagnetic field having higher frequency components than the frequency of the major components of the time dependent magnetic field, said biasing field generating induction that is at least about equal to the remanent induction.
Claim 3
Dependent Claim
16 words
The method as set forth in claim 1 wherein the biasing field direction rotates in time.
Claim 4
Dependent Claim
34 words
The method as set forth in claim 1 wherein the biasing field is modulated by a frequency intermediate between the biasing frequency and the frequency of the major components of the time dependent field.
Claim 5
Dependent Claim
29 words
The method as set forth in claim 1 wherein the biasing field has a waveform with a relatively long dwell time near the coercive field strength H c .
Claim 6
Dependent Claim
26 words
The method as set forth in claim 1 wherein the direction of the biasing magnetic field is about parallel to the plane of the metallic glass.
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) | 1985-07-19 | 1986-01-18 | 1986-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-07-19 | 1990-01-18 | 1990-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-07-19 | 1994-01-18 | 1994-07-20 | $7700.00 | Window Closed / Lapsed |