Patent EP0244057A2 successfully refreshed from Google Patents.
US3689902A
Expired / Lapsed
US
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Cylindrical magnetic domain decoder
Assignee: International Business Machines Corp
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Filing: 1971-06-30
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Granted: 1972-09-05
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Expires: 1991-06-30
Abstract
Abstract A decoder for cylindrical magnetic domain shift registers having means to clear the information from selected registers thus enabling new information to be written into those registers. The decoder is incorporated into 2N closed loop shift registers and uses only a small part of the storage area of the magnetic sheet in which domains exist. It is activated by 2N control lines (N pairs). Depending upon the activation of the decoder, the information in a selected shift register is passed to a clear means which sends it into one of two paths depending upon the activation of the clear means. One path brings the information to a detector for destructive readout, while the other path brings the information to a domain splitter. The domain splitter splits the input domains into two parts, one of which propagates to the detector while the other returns to the proper shift register. Thus, non-destructive readout (NDRO) or destructive read-out (DRO) is provided depending upon the activation of the clear means.
Inventors
- 👤 Hsu Chang
- 👤 George E Keefe
- 👤 Yeong S Lin
- 👤 Laurence L Rosier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:57
CPC Classifications
G; G11; G11C; G11C19/00; G11C19/02; G11C19/08; G11C19/0875; H; H03; H03M; H03M7/00; H03M7/001; H03M7/002
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
145 words
An apparatus for cylindrical magnetic domains, comprising: a magnetic sheet in which said domains can be propagated; bias means for stabilizing said domains in said sheet; storage means for storing information as the presence and absence of said domains; decoder means integrated with said storage means for selecting any of said storage means for information readout; sensing means for sensing domains in selected storage means, thereby providing information readout of said storage means; means for returning said domains to said selected storage means after sensing by said sensing means; clear means associated with said storage means for removing information from said selected storage means thereby providing room in said selected storage means for new information; writing means associated with each said storage means for writing new information into said selected storage means upon removal of information from said selected storage means by said clear means.
Claim 2
Independent Claim
145 words
An apparatus for cylindrical magnetic domains, comprising: a magnetic sheet in which said domains can be propagated; bias means for stabilizing said domains in said sheet; storage means for storing information as the presence and absence of said domains; decoder means integrated with said storage means for selecting any of said storage means for information readout; sensing means for sensing domains in selected storage means, thereby providing information readout of said storage means; means for returning said domains to said selected storage means after sensing by said sensing means; clear means associated with said storage means for removing information from said selected storage means thereby providing room in said selected storage means for new information; writing means associated with each said storage means for writing new information into said selected storage means upon removal of information from said selected storage means by said clear means.
Claim 3
Dependent Claim
43 words
The apparatus of claim 1, where said clear means is comprised of a current loop which is associated with all said storage means, the presence and absence of current in said loop determining whether said domains are removed from said selected storage means.
Claim 4
Dependent Claim
43 words
The apparatus of claim 1, where said decoder means is comprised of a plurality of current loops associated with said storage means, the presence and absence of currents in said decoder determining which of said storage means is to have its information sensed.
Claim 5
Dependent Claim
33 words
The apparatus of claim 1, further including control means for activating said decoder, said clear means, and said writing means to initiate information readout, clearing, and regeneration of information in selected storage means.
Claim 6
Dependent Claim
56 words
The apparatus of claim 1, where each said storage means is comprised of a shift register in which said domains propagate, said decoder and clear means being located on said magnetic sheet and intercepting each said shift register, current pulses in said decoder and said clear means affecting propagation of said domains in said shift register.
Claim 7
Dependent Claim
36 words
The apparatus of claim 1, where said means for returning said domains includes domain splitters for splitting said domains into a plurality of new domains, one of said new domains being returned to said storage means.
Claim 8
Dependent Claim
34 words
The apparatus of claim 1, further including domain busters located on said magnetic sheet for destroying domaIns from selected storage means when said information is removed from said storage means by said clear means.
Claim 9
Independent Claim
150 words
An apparatus for cylindrical magnetic domains, comprising: a magnetic sheet in which said domains can be propagated; bias means for stabilizing the diameter of said domains; a plurality of propagation paths on said sheet for moving said domains within said sheet; drive means associated with said propagation paths for moving said domains along said propagation paths; decoder means associated with said propagation paths for selectively diverting said domains from said paths; sensing means for sensing the presence and absence of said domains in selected paths; clear means associated with said propagation paths and with said decoder for directing domains from selected registers into one of two paths depending on the activation of said clear means, said clear means removing domains from said selected propagation paths in response to activation of said clear means; means for returning said domains to said selected propagation paths if said clear means is not activated.
Claim 10
Independent Claim
150 words
An apparatus for cylindrical magnetic domains, comprising: a magnetic sheet in which said domains can be propagated; bias means for stabilizing the diameter of said domains; a plurality of propagation paths on said sheet for moving said domains within said sheet; drive means associated with said propagation paths for moving said domains along said propagation paths; decoder means associated with said propagation paths for selectively diverting said domains from said paths; sensing means for sensing the presence and absence of said domains in selected paths; clear means associated with said propagation paths and with said decoder for directing domains from selected registers into one of two paths depending on the activation of said clear means, said clear means removing domains from said selected propagation paths in response to activation of said clear means; means for returning said domains to said selected propagation paths if said clear means is not activated.
Claim 11
Dependent Claim
36 words
The apparatus of claim 8, where said clear means is a current loop that crosses each said propagation path, current pulses in said loop changing the direction of propagation of domains in said selected propagation paths.
Claim 12
Dependent Claim
68 words
The apparatus of claim 8, further including writing means for generating domains in selected paths, said writing means being activated when said clear means is activated to generate domains in those paths from which domains are removed; and control means connected to said clear means and to said writing means for activating said clear means and said writing means thereby controlling removal of domains and writing of domains.
Claim 13
Dependent Claim
23 words
The apparatus of claim 8, further including means for destroying domains which are removed from said selected propagation paths by said clear means.
Claim 14
Dependent Claim
37 words
The apparatus of claim 8, where said decoder means is comprised of a plurality of current loops which cross said propagation paths, current in said decoder loops changing the direction of propagation of domains in selected paths.
Claim 15
Independent Claim
232 words
An apparatus for cylindrical magnetic domains, comprising: a magnetic sheet in which said domains can be propagated; bias means for stabilizing the diameter of said domains; a plurality of propagation paths for said domains, said domains moving along said paths in response to applied drive pulses; drive means for providing said drive pulses to move said domains along said paths; decode means comprising a plurality of current loops located adjacent said magnetic sheet and crossing said paths, current in said loops changing the effect of said drive pulses on said propagation, for passing domains in selected paths to a sensing means; sensing means for detection of domains from paths selected by said decoding means; propagation means for returning said detected domains to their associated selected propagation paths, said propagation means moving said detected domains in response to said drive pulses; clear means comprising a further current loop located adjacent said magnetic sheet and crossing each said propagation path, current in said clear means loop changing the effect of said drive pulses on domain propagation in those paths which have been selected by said decoder means, said clear loop removing said domains from said propagation paths when suitably activated; writing means for generating domains in selected paths in response to control pulses applied thereto; and control means connected to said clear means and to said writing means for applying said control pulses thereto.
Claim 16
Independent Claim
232 words
An apparatus for cylindrical magnetic domains, comprising: a magnetic sheet in which said domains can be propagated; bias means for stabilizing the diameter of said domains; a plurality of propagation paths for said domains, said domains moving along said paths in response to applied drive pulses; drive means for providing said drive pulses to move said domains along said paths; decode means comprising a plurality of current loops located adjacent said magnetic sheet and crossing said paths, current in said loops changing the effect of said drive pulses on said propagation, for passing domains in selected paths to a sensing means; sensing means for detection of domains from paths selected by said decoding means; propagation means for returning said detected domains to their associated selected propagation paths, said propagation means moving said detected domains in response to said drive pulses; clear means comprising a further current loop located adjacent said magnetic sheet and crossing each said propagation path, current in said clear means loop changing the effect of said drive pulses on domain propagation in those paths which have been selected by said decoder means, said clear loop removing said domains from said propagation paths when suitably activated; writing means for generating domains in selected paths in response to control pulses applied thereto; and control means connected to said clear means and to said writing means for applying said control pulses thereto.
Claim 17
Dependent Claim
23 words
The apparatus of claim 13, further including domain collapsers for destroying domains which have been removed from selected paths by said clear means.
Claim 18
Dependent Claim
34 words
The apparatus of claim 13, where said propagation paths are defined by magnetically soft patterns deposited on said magnetiC sheet and said drive pulses are magnetic pulses in the plane of said magnetic sheet.
Claim 19
Dependent Claim
35 words
The apparatus of claim 13, where said propagation paths are closed loops in which said domains circulate in response to application of said drive pulses, said decoder current loops intersecting said closed loop propagation paths.
Claim 20
Independent Claim
248 words
An apparatus for cylindrical magnetic domains, comprising: a magnetic sheet in which said domains can be propagated; bias means for stabilizing the diameter of domains in said sheet; storage means comprising a plurality of propagation means arranged in closed loops in which said domains propagate in response to application of drive pulses to said propagation means; drive means for applying said drive pulses to said propagation means; writing means for generating domains in selected closed loops; decoder means for directing domains in selected closed loops to a sensing means, said decoder means being comprised of a plurality of current loops which cross said propagation means, current in said decoder loops changing the effect of said propagation means on said domain propagation at those regions where said decoder loops cross said propagation means; sensing means for detecting domains from said selected closed loops, clear means for removing domains from selected closed loops, said clear means being comprised of a further current loop which crosses said propagation means, current in said further current loop changing the effect of said drive pulses on said propagation means in those regions where said further current loop crosses said propagation means; control means for selectively applying current pulses to said decoder current loops, said clear means, and said writing means for generation of domains in those closed loop storage means from which domains are removed by said clear means; and domain busters for destroying domains removed from selected closed loops by said clear means.
Claim 21
Independent Claim
248 words
An apparatus for cylindrical magnetic domains, comprising: a magnetic sheet in which said domains can be propagated; bias means for stabilizing the diameter of domains in said sheet; storage means comprising a plurality of propagation means arranged in closed loops in which said domains propagate in response to application of drive pulses to said propagation means; drive means for applying said drive pulses to said propagation means; writing means for generating domains in selected closed loops; decoder means for directing domains in selected closed loops to a sensing means, said decoder means being comprised of a plurality of current loops which cross said propagation means, current in said decoder loops changing the effect of said propagation means on said domain propagation at those regions where said decoder loops cross said propagation means; sensing means for detecting domains from said selected closed loops, clear means for removing domains from selected closed loops, said clear means being comprised of a further current loop which crosses said propagation means, current in said further current loop changing the effect of said drive pulses on said propagation means in those regions where said further current loop crosses said propagation means; control means for selectively applying current pulses to said decoder current loops, said clear means, and said writing means for generation of domains in those closed loop storage means from which domains are removed by said clear means; and domain busters for destroying domains removed from selected closed loops by said clear means.
Claim 22
Dependent Claim
56 words
The apparatus of claim 17, further including domain splitters associated with each closed loop for splitting domains from closed loops selected by said decoder current loops, said splitters producing two new domains one of which is propagated to said selected closed loop while the other is propagated to said sensing means and to said domain busters.
Claim 23
Dependent Claim
36 words
The apparatus of claim 17, where said propagation means are magnetically soft elements deposited on said magnetic sheet and said decoder current loops and said further current loop are conductors deposited adjacent said magnetically soft elements.
Claim 24
Dependent Claim
22 words
The apparatus of claim 17, where said further current loop is a single conductor which crosses each said closed loop storage means.
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) | 1975-09-05 | 1976-03-06 | 1976-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-05 | 1980-03-06 | 1980-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-05 | 1984-03-06 | 1984-09-05 | $7700.00 | Window Closed / Lapsed |