US3701981A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Three-dimensional storage device comprising magnetic memory elements
Assignee: US Philips Corp
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Filing: 1970-10-22
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Granted: 1972-10-31
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Expires: 1990-10-22
Abstract
Abstract Three-dimensional store in which the x- and/or the y- with the z-conductors are connected in series to one or to two current sources. The internal dissipation of the store is thus reduced and a complete compensation both in waveform and in time of half the write current is obtained by the forbidding current. A plurality of z-conductors may be used in each plane for reducing the impedance connected to the current source, said zconductors forming mutual dummies.
Inventors
- 👤 Gerrit Hilbertus Schouten
- 👤 Nicolaas Bohlmeijer
- 👤 Hendrik Van Der Steeg
- 👤 Marinus Cornelius Van D Maarel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 11:55
CPC Classifications
G; G11; G11C; G11C11/00; G11C11/02; G11C11/06; G11C11/06007; G11C11/06014; G11C11/06021; G11C11/06028; G11C11/06035
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
130 words
A storage device comprising magnetic memory elements coupled each with an x, a y- and a z-conductor, the x- and y-conductors each including selection switches coupling said conductors to a write current source, said current source further supplying a counteracting current of half the strength required for writing information in said memory element, switching means responsive to the selection of a memory element associated therewith in accordance with the information to be recorded for connecting said z-conductor of each memory element in series in opposite senses with one of the conductors of the group formed by the xand y-conductors of said memory element, and means for applying to said z-conductor simultaneously with the write current, said counteracting current of half the write current from said current source through said z-conductor.
Claim 2
Dependent Claim
130 words
A storage device comprising magnetic memory elements coupled each with an x, a y- and a z-conductor, the x- and y-conductors each including selection switches coupling said conductors to a write current source, said current source further supplying a counteracting current of half the strength required for writing information in said memory element, switching means responsive to the selection of a memory element associated therewith in accordance with the information to be recorded for connecting said z-conductor of each memory element in series in opposite senses with one of the conductors of the group formed by the xand y-conductors of said memory element, and means for applying to said z-conductor simultaneously with the write current, said counteracting current of half the write current from said current source through said z-conductor.
Claim 3
Dependent Claim
58 words
A storage device as claimed in claim 1, wherein upon the selection of a memory element whose z-conductor must not carry a forbidding current during writing, said one conductor of the group formed by the x- and y-conductors of the memory element is connected in series with a network whose impedance is equal to that of the z-conductor.
Claim 4
Dependent Claim
108 words
A storage device as claimed in claim 2, wherein said storage device comprises a plurality of magnetic elements arranged in a plurality of planes, each of said planes made up of said memory elements arranged in a plurality of columns and rows, the memory elements being coupled to each column of each plane with said x-conductor and in each row of each plane with said y-conductor, characterized in that in each plane said z-conductor is provided in common for a group of memory elements and in that for a network is coupled to each common z-conductor, said network having an impedance equal to that of the common z-conductor.
Claim 5
Dependent Claim
47 words
A storage device as claimed in claim 3 characterized in that in each plane a plurality of identical groups of memory elements are coupled each with a common z-conductor and in that said network is formed by a z-conductor coupled with a further group of memory elements.
Claim 6
Dependent Claim
25 words
A storage device as claimed in claim 4 characterized in that the x-, y- and z-conductors are coupled to their current sources through transformer couplings.
Claim 7
Dependent Claim
48 words
A storage device as claimed in claim 5 characterized in that the conductors are coupled via a first transformer coupling with one of a group of current circuits common to a plurality of conductors, said current circuits each being coupled with their current source via a second transformer.
Claim 8
Dependent Claim
22 words
A storage device as claimed in claim 5 characterized in that at least one of the transformer couplings comprises a balance-unbalance transformer.
Claim 9
Dependent Claim
66 words
A storage device as claimed in claim 7 characterized in that at least one of the transformer couplings comprises two balance-unbalance transformers connected so that a current supplied from the current source passes through the primary winding of one of the transformers, the primary winding of the other transformer, the secondary winding of one transformer and the secondary winding of the other transformer in that order.
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) | 1975-10-31 | 1976-05-01 | 1976-10-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-31 | 1980-05-01 | 1980-10-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-31 | 1984-05-01 | 1984-10-31 | $7700.00 | Window Closed / Lapsed |