US3587066A
Expired / Lapsed
US
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Magnetic memory
Assignee: Thales SA
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Filing: 1968-03-26
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Granted: 1971-06-22
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Expires: 1988-03-26
Abstract
Abstract A memory arrangement of the matrix type having associated readout and write-in circuits, the readout circuits being designed to provide readout pulses having the same polarity as to write-in pulses so as not to destroy the information contained in each memory element.
Inventors
- 👤 Daniel Gibacier
- 👤 Tran Van Khai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 06:59
CPC Classifications
G; G11; G11C; G11C11/00; G11C11/02; G11C11/06; G11C11/06085
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
203 words
A waffle iron memory comprising a layer of ferromagnetic material having a rectangular hysteresis loop and a keeper of a magnetically soft material extending parallelly to said layer; said keeper comprising: a first and second plurality of parallel grooves forming a matrix; a first and a second plurality of wires extending respectively in said first and second plurality of wires extending respectively in said first and second pluralities of grooves and having a plurality of crossing points; means for simultaneously feeding to one wire of said first plurality one pulse, having a predetermined level corresponding to a significant digit 1 or 0 and for feeding to one wire of said second plurality a word write-in pulse having a predetermined level; means for successively feeding to said one wire of said second plurality word readout pulses of the same polarity as said write-in pulses, said readout pulses having a level so adjusted as to switch the magnetic flux in the immediate vicinity of the crossing point of said wires and to cause a reversible flux direction rotation in the grooves of said first plurality; and means connected to said wires of said first plurality for collecting signal voltage in response to said flux switching.
Claim 2
Dependent Claim
203 words
A waffle iron memory comprising a layer of ferromagnetic material having a rectangular hysteresis loop and a keeper of a magnetically soft material extending parallelly to said layer; said keeper comprising: a first and second plurality of parallel grooves forming a matrix; a first and a second plurality of wires extending respectively in said first and second plurality of wires extending respectively in said first and second pluralities of grooves and having a plurality of crossing points; means for simultaneously feeding to one wire of said first plurality one pulse, having a predetermined level corresponding to a significant digit 1 or 0 and for feeding to one wire of said second plurality a word write-in pulse having a predetermined level; means for successively feeding to said one wire of said second plurality word readout pulses of the same polarity as said write-in pulses, said readout pulses having a level so adjusted as to switch the magnetic flux in the immediate vicinity of the crossing point of said wires and to cause a reversible flux direction rotation in the grooves of said first plurality; and means connected to said wires of said first plurality for collecting signal voltage in response to said flux switching.
Claim 3
Dependent Claim
23 words
A memory as claimed in claim 1, wherein said signal voltage collecting means are selectively connected to said wires of said first plurality.
Claim 4
Dependent Claim
20 words
A memory as claimed in claim 1, in which each wire is loop shaped and extends into two adjacent grooves.
Claim 5
Dependent Claim
62 words
A memory as claimed in claim 1, wherein said means for feeding said wires of said second plurality further generate in synchronism with said digit pulses, erasing pulses of polarity opposite to that of said write-in pulses, preceding said write-in pulses, the sum of the duration of said write-in pulses and said erasing pulses being equal to that of said digit pulses.
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) | 1974-06-21 | 1974-12-21 | 1975-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-21 | 1978-12-21 | 1979-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-21 | 1982-12-21 | 1983-06-22 | $7700.00 | Window Closed / Lapsed |