US3611327A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic film array
Assignee: Bull HN Information Systems Italia SpA
•
Filing: 1968-03-18
•
Granted: 1971-10-05
•
Expires: 1988-03-18
Abstract
Abstract A nondestructive readout memory comprising anisotropic magnetic thin film elements which have a high coercivity material interspersed within a portion of each element for preventing the orientation of the magnetization from rotating to the hard axis.
Inventors
- 👤 Wolfgang W O G Kayser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 09:33
CPC Classifications
H; H05; H05B; H05B1/00; H05B1/02; H05B1/0227; H05B1/023; A; A47; A47J; A47J29/00; A47J29/02; G; G11; G11B; G11B5/00; G11B5/02; G11C; G11C11/00; G11C11/02; G11C11/14
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
156 words
A nondestructive readout memory array comprising, in combination: a substrate for supporting magnetic film; a magnetic film disposed on said substrate for storing digital information at a plurality of digit sites therein, said film having an easy axis of magnetization and a hard axis of magnetization, and each of said digit sites comprising two memory sites having a domain boundary therebetween; means for orienting the magnetization of the film along the easy axis at the memory sites for storing digital information; means for rotating the magnetization of a first portion of the film at said memory sites to the hard axis to read information stored in the film; and means at said memory sites for preventing rotation of the magnetization of a second portion of the film to the hard axis, said means for preventing rotation of the magnetization to the hard axis includes high coercivity material interspersed within the second portion of the magnetic film.
Claim 2
Dependent Claim
156 words
A nondestructive readout memory array comprising, in combination: a substrate for supporting magnetic film; a magnetic film disposed on said substrate for storing digital information at a plurality of digit sites therein, said film having an easy axis of magnetization and a hard axis of magnetization, and each of said digit sites comprising two memory sites having a domain boundary therebetween; means for orienting the magnetization of the film along the easy axis at the memory sites for storing digital information; means for rotating the magnetization of a first portion of the film at said memory sites to the hard axis to read information stored in the film; and means at said memory sites for preventing rotation of the magnetization of a second portion of the film to the hard axis, said means for preventing rotation of the magnetization to the hard axis includes high coercivity material interspersed within the second portion of the magnetic film.
Claim 3
Dependent Claim
19 words
The memory array of claim 1 in which the second portion of the film is adjacent the domain boundary.
Claim 4
Dependent Claim
20 words
The memory array of claim 1 in which the second portion of the film is disposed remotely from the substrate.
Claim 5
Dependent Claim
127 words
A nondestructive readout memory array comprising, in combination: anisotropic magnetic material of relatively low coercivity, having an easy axis of magnetization and a hard axis of magnetization, for storing information at a plurality of memory sites; means for orienting the magnetization of the material along the easy axis at said memory sites; means for rotating the magnetization of a first portion of the material substantially to the hard axis to read out the stored information; and means for returning the magnetization to its orientation along easy axis, said means for returning the magnetization including material of relatively high coercivity interspersed within a second portion of the magnetic material for preventing the magnetization of said second portion of the magnetic material from rotating substantially to the hard axis.
Claim 6
Dependent Claim
127 words
A nondestructive readout memory array comprising, in combination: anisotropic magnetic material of relatively low coercivity, having an easy axis of magnetization and a hard axis of magnetization, for storing information at a plurality of memory sites; means for orienting the magnetization of the material along the easy axis at said memory sites; means for rotating the magnetization of a first portion of the material substantially to the hard axis to read out the stored information; and means for returning the magnetization to its orientation along easy axis, said means for returning the magnetization including material of relatively high coercivity interspersed within a second portion of the magnetic material for preventing the magnetization of said second portion of the magnetic material from rotating substantially to the hard axis.
Claim 7
Dependent Claim
33 words
The array of claim 4 in which the means for returning the magnetization includes a layer of material of relatively high coercivity disposed intermediate the first and second portions of the magnetic material.
References Cited (Backward Citations)
US3343145A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-10-04 | 1975-04-05 | 1975-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-04 | 1979-04-05 | 1979-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-04 | 1983-04-05 | 1983-10-05 | $7700.00 | Window Closed / Lapsed |