Patent US3609720A successfully refreshed from Google Patents.
US3609720A
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Magnetic domain detector
Assignee: AT&T Inc
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Filing: 1969-12-08
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Granted: 1971-09-28
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Expires: 1989-12-08
Abstract
Abstract Single wall domains are moved synchronously in a sheet of magnetic material along channels defined by magnetically soft overlays as an in-plane magnetic field reorients. A detector is described which includes as an integral part thereof a portion of the overlay defining the propagation channels.
Inventors
- 👤 Walter Strauss
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 04:11
CPC Classifications
G; G11; G11C; G11C19/00; G11C19/02; G11C19/08; G11C19/0866; H; H03; H03K; H03K17/00; H03K17/51; H03K17/80; H03K17/84
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
89 words
Apparatus comprising magnetic material in a plane in which single wall domains can be moved And having a first surface, a magnetically soft overlay adjacent said first surface, said overlay comprising spaced elements having geometries to move single wall domains from input to output positions in response to a reorienting in-plane field, a plurality of electrical conductors connected to one of said elements at said output position, means for providing an electric current connected to said conductors and means for detecting the effect of a domain on said current.
Claim 2
Dependent Claim
89 words
Apparatus comprising magnetic material in a plane in which single wall domains can be moved And having a first surface, a magnetically soft overlay adjacent said first surface, said overlay comprising spaced elements having geometries to move single wall domains from input to output positions in response to a reorienting in-plane field, a plurality of electrical conductors connected to one of said elements at said output position, means for providing an electric current connected to said conductors and means for detecting the effect of a domain on said current.
Claim 3
Dependent Claim
21 words
Apparatus in accordance with claim 1 wherein said overlay comprises bar and T-shaped elements and said in-plane field reorients by rotation.
Claim 4
Dependent Claim
52 words
Apparatus in accordance with claim 2 wherein said means for providing an electric current is connected to a first pair of said plurality of electrical conductors affixed to one of said T-shaped elements, the conductors of said first pair being spaced-apart from one another along the direction of movement of a domain.
Claim 5
Dependent Claim
52 words
Apparatus in accordance with claim 3 wherein said means for detecting comprises a second pair of said plurality of electrical conductors affixed to said one of said T-shaped elements, said conductors of said second pair being spaced-apart from one another along a direction perpendicular to the direction of movement of a domain.
Claim 6
Dependent Claim
31 words
Apparatus in accordance with claim 4 including two of said T-shaped elements each having first and second pairs of electrical conductors, like designated pairs of each being connected electrically in series.
Claim 7
Dependent Claim
51 words
Apparatus in accordance with claim 4 wherein said overlay has a geometry to move single wall domains along a plurality of channels from input to associated output positions, one of each of said first and second electrical conductor pairs being affixed to a T-shaped element at each of said output positions.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-27 | 1975-03-29 | 1975-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-27 | 1979-03-29 | 1979-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-27 | 1983-03-29 | 1983-09-28 | $7700.00 | Window Closed / Lapsed |