Patent US3793640A successfully refreshed from Google Patents.
US3793640A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for the magnetic domain {37 bubble{38 {11 storage of data
Assignee: US Philips Corp
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Filing: 1972-07-03
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Granted: 1974-02-19
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Expires: 1992-07-03
Abstract
Abstract A device for the magnetic storage of information in which information is written on a magnetizable medium by means of the external field of a stable magnetic domain which is supported by a plate of a magnetic material having an easy axis of magnetization which is normal to the plane of the plate. For recording a number of juxtaposed tracks on the medium, the plate may comprise one stable magnetic domain per track to be recorded.
Inventors
- 👤 J Potgiesser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 04:41
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/76; H04N5/78; H04N5/782; G; G11; G11B; G11B5/00; G11B5/127; G11B5/33; G11B5/37; G11B5/48; G11B5/49; G11B5/4907; G11B5/4915; G11B5/4923; G11B5/493; G11B5/4938; G11B5/4946
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
164 words
A device for the magnetic storage of information comprising a remanent magnetizable recording medium having a given coercive field strength provided on a carrier, said recording medium having a plurality of information tracks, means cooperating with said carrier to selectively influence the recording medium comprising a plate of magnetizable material having one cylindrical magnetic domain for each information track, means for producing a first magnetization field having a field strength sufficient to maintain magnetic domains in said plate and having a direction normal to the plane of the plate, said domains each having a field which influences the local state of magnetization of the recording medium, means to move the recording medium relative to and parallel to the plate, and means to produce a second magnetization field having a field strength smaller than the coercive field strength of the recording medium and having a direction normal to the direction of the first field for influencing the local state of magnetization of the recording medium.
Claim 2
Independent Claim
164 words
A device for the magnetic storage of information comprising a remanent magnetizable recording medium having a given coercive field strength provided on a carrier, said recording medium having a plurality of information tracks, means cooperating with said carrier to selectively influence the recording medium comprising a plate of magnetizable material having one cylindrical magnetic domain for each information track, means for producing a first magnetization field having a field strength sufficient to maintain magnetic domains in said plate and having a direction normal to the plane of the plate, said domains each having a field which influences the local state of magnetization of the recording medium, means to move the recording medium relative to and parallel to the plate, and means to produce a second magnetization field having a field strength smaller than the coercive field strength of the recording medium and having a direction normal to the direction of the first field for influencing the local state of magnetization of the recording medium.
Claim 3
Dependent Claim
47 words
A device as claimeD in claim 1, wherein the direction of the second magnetization field is parallel to the direction in which the recording medium is relatively movable and the amplitude of the second magnetization field is variable in accordance with an information signal to be recorded.
Claim 4
Dependent Claim
26 words
A device as claimed in claim 1, wherein the direction of the second magnetization field is variable in accordance with an information signal to be recorded.
Claim 5
Dependent Claim
55 words
A device as claimed in claim 3, wherein the direction of the second magnetization field is normal to the direction in which the recording medium is movable and has a first sense of direction or a second sense of direction opposite to the first one in accordance with a binary information signal to be recorded.
Claim 6
Dependent Claim
77 words
A device as claimed in claim 1, including means for moving a cylindrical magnetic domain in the plate along an axis which forming an angle with the direction of movement of the medium, the direction of the second magnetization field being parallel to the relative direction of movement of the cylindrical magnetic domain relative to the recording medium, and the amplitude of the second magnetization field being variable in accordance with an information signal to be recorded.
References Cited (Backward Citations)
US3503054A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-02-18 | 1977-08-20 | 1978-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-18 | 1981-08-20 | 1982-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-18 | 1985-08-20 | 1986-02-19 | $7700.00 | Window Closed / Lapsed |