US5260653A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thin film very high sensitivity magnetoresistive magnetometer having temperature compensation and simple domain stability
Assignee: Eastman Kodak Co
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Filing: 1992-06-03
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Granted: 1993-11-09
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Expires: 2012-06-03
Abstract
Abstract A thin film magnetometer includes first and second thin film magnetoresistive elements and first and second thin film laminated flux collectors. The first magnetoresistive element is located in a gap formed by the flux collectors, and the second magnetoresistive element is subtantially magnetically shielded by the flux collectors, and acts as a thermistor. The magnetoresistive elements are connected in a bridge circuit whereby any signal component due to thermal effects on the magnetoresistive elements is removed from the signal produced by the first magnetoresistive element.
Inventors
- 👤 Neil Smith
- 👤 Jay D. Freeman
- 👤 Frederick J. Jeffers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 23:09
CPC Classifications
G; G01; G01R; G01R33/00; G01R33/02; G01R33/06; G01R33/09
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
142 words
A magnetoresistive magnetometer, comprising: a) first and second thin film magnetoresistive elements deposited side-by-side on a substrate and each forming a portion of a circuit capable of detecting changes in resistance across each of said magnetoresistive elements; b) first and second thin film laminated flux concentrators disposed over said magnetoresistive elements said first and second flux concentrators being arranged: 1) to define a gap over said first magnetoresistive element such that a component of a magnetic field in the vicinity of the magnetometer in a direction across the gap is magnified and a component of the magnetic field along the gap is reduced, and 2) to substantially magnetically shield said second magnetoresistive element from external magnetic fields; and c) bridge circuit means connected to said first and second magnetoresistive elements wherein thermally induced signals from said first and second elements are cancelled.
Claim 2
Dependent Claim
142 words
A magnetoresistive magnetometer, comprising: a) first and second thin film magnetoresistive elements deposited side-by-side on a substrate and each forming a portion of a circuit capable of detecting changes in resistance across each of said magnetoresistive elements; b) first and second thin film laminated flux concentrators disposed over said magnetoresistive elements said first and second flux concentrators being arranged: 1) to define a gap over said first magnetoresistive element such that a component of a magnetic field in the vicinity of the magnetometer in a direction across the gap is magnified and a component of the magnetic field along the gap is reduced, and 2) to substantially magnetically shield said second magnetoresistive element from external magnetic fields; and c) bridge circuit means connected to said first and second magnetoresistive elements wherein thermally induced signals from said first and second elements are cancelled.
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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) | 1996-11-08 | 1997-05-10 | 1997-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-11-08 | 2001-05-10 | 2001-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-11-08 | 2005-05-10 | 2005-11-09 | $7700.00 | Window Closed / Lapsed |