US3879760A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic transducers
Assignee: Compagnie Internationale pour l'Informatique CII-Honeywell Bull SA
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Filing: 1974-02-22
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Granted: 1975-04-22
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Expires: 1994-02-22
Abstract
Abstract Two magnetoresistive layers are magnetostatically coupled and electrically interconnected for summation of an electrical current passing through each of them in the same direction which is slanted at 45* with respect to the axes of easy magnetization of the layers, said axes being 90* to each other from one layer to the other. When this transducer structure is placed in close proximity to a magnetic record the information significant discontinuities of which are perpendicular to the spacing of the layers, the variations of the electrical current applied to the layers and summed at their outputs are proportional to the value of the magnetic field from the record as seen through a window of a width equal to the spacing of the layers in the transducer.
Inventors
- 👤 Jean-Pierre Lazzari
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:40
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/33; G11B5/39; G11B5/3903; G11B5/3906; G11B5/3945; G11B5/3948; G11B5/3951; G11B5/3954
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
173 words
Magnetic transducer comprising the combination of: a first layer of anisotropic magnetoresistive magnetic material, a second layer of anisotropic magnetoresistive magnetic material, an intervening layer of insulating non-magnetic material magnetostatically coupling the said first and second magnetic layers, a pair of electrical terminals connected to opposite ends of the first layer for application thereto of an electrical current the direction of flow of which substantially parallels the greater dimension of said layer, a pair of electrical terminals connected to opposite ends of the second layer for application thereto of an electrical current the direction of flow of which substantially parallels the greater dimension of said layer, means for summing the outputs of the voltage drops across the terminals of the said first and second layers, said first and second layers being of identical geometry and each having An easy axis of magnetization of substantially 45* slant with respect to the said greater dimension, said axes of the said layers being relatively displaced by substantially 90* from the first layer to the second one.
Claim 2
Dependent Claim
173 words
Magnetic transducer comprising the combination of: a first layer of anisotropic magnetoresistive magnetic material, a second layer of anisotropic magnetoresistive magnetic material, an intervening layer of insulating non-magnetic material magnetostatically coupling the said first and second magnetic layers, a pair of electrical terminals connected to opposite ends of the first layer for application thereto of an electrical current the direction of flow of which substantially parallels the greater dimension of said layer, a pair of electrical terminals connected to opposite ends of the second layer for application thereto of an electrical current the direction of flow of which substantially parallels the greater dimension of said layer, means for summing the outputs of the voltage drops across the terminals of the said first and second layers, said first and second layers being of identical geometry and each having An easy axis of magnetization of substantially 45* slant with respect to the said greater dimension, said axes of the said layers being relatively displaced by substantially 90* from the first layer to the second one.
Claim 3
Dependent Claim
173 words
Magnetic transducer comprising the combination of: a first layer of anisotropic magnetoresistive magnetic material, a second layer of anisotropic magnetoresistive magnetic material, an intervening layer of insulating non-magnetic material magnetostatically coupling the said first and second magnetic layers, a pair of electrical terminals connected to opposite ends of the first layer for application thereto of an electrical current the direction of flow of which substantially parallels the greater dimension of said layer, a pair of electrical terminals connected to opposite ends of the second layer for application thereto of an electrical current the direction of flow of which substantially parallels the greater dimension of said layer, means for summing the outputs of the voltage drops across the terminals of the said first and second layers, said first and second layers being of identical geometry and each having An easy axis of magnetization of substantially 45* slant with respect to the said greater dimension, said axes of the said layers being relatively displaced by substantially 90* from the first layer to the second one.
Claim 4
Dependent Claim
173 words
Magnetic transducer comprising the combination of: a first layer of anisotropic magnetoresistive magnetic material, a second layer of anisotropic magnetoresistive magnetic material, an intervening layer of insulating non-magnetic material magnetostatically coupling the said first and second magnetic layers, a pair of electrical terminals connected to opposite ends of the first layer for application thereto of an electrical current the direction of flow of which substantially parallels the greater dimension of said layer, a pair of electrical terminals connected to opposite ends of the second layer for application thereto of an electrical current the direction of flow of which substantially parallels the greater dimension of said layer, means for summing the outputs of the voltage drops across the terminals of the said first and second layers, said first and second layers being of identical geometry and each having An easy axis of magnetization of substantially 45* slant with respect to the said greater dimension, said axes of the said layers being relatively displaced by substantially 90* from the first layer to the second one.
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) | 1978-04-21 | 1978-10-21 | 1979-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-21 | 1982-10-21 | 1983-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-21 | 1986-10-21 | 1987-04-22 | $7700.00 | Window Closed / Lapsed |