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US3623035A Expired / Lapsed US ⏱️ 0.0 years remaining

Magnetic memory matrix and process for its production

Assignee: Fuji Electric Co Ltd
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Filing: 1969-01-21
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Granted: 1971-11-23
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Expires: 1989-01-21
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Abstract

Abstract A magnetic memory matrix is composed of a plurality of tubes of ferrite material and a magnetic keeper. Depressions on the surface of the keeper hold the ferrite tubes and other depressions define bit areas, the two groups of depressions intersecting at right angles with each other and the depressions of each group being substantially in parallel alignment. Word wires are arranged in parallel lines between those depressions defining bit areas, and a bit wire and a sense wire are threaded through each ferrite tube. The depressions defining the bit areas effectively define the flux paths around the word wires. The process for making the magnetic keeper comprises (1) mixing fine fired ferrite particles with an organic binder, i.e. a solution of thermoplastic, (2) pressing and forming a board from the mixture, and (3) forming the two kinds of depressions on the board.

Inventors

  • 👤 Seihin Kobayashi
  • 👤 Michihiro Torii
  • 👤 Masanori Kurahashi

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-02 15:39
CPC Classifications
G; G11; G11C; G11C11/00; G11C11/02; G11C11/06; G11C11/06085

Claims Analysis

Total Claims: 10
Claim 1
Independent Claim 151 words
A magnetic memory matrix comprising: a. a keeper 23 made of magnetic material having high magnetic permeability; b. a plurality of elongated magnetic memory components; c. a first plurality of depressions 24 arranged substantially in parallel with each other and aligned in one direction in the surface of said keeper, for holding said magnetic memory components therein; d. a plurality of word wires 25 arranged within said keeper and intersecting with said magnetic memory components; e. a sense wire and a digit wire threaded through each of the said magnetic memory components; and f. a second plurality of depressions 22 which are substantially parallel with each other and aligned in another direction from the alignment of the first plurality of depressions, the second depressions being on both sides of said word wires 25 on the keeper 23 and intersecting with said depressions 24 for defining magnetic flux paths around memory cells.
Claim 2
Dependent Claim 151 words
A magnetic memory matrix comprising: a. a keeper 23 made of magnetic material having high magnetic permeability; b. a plurality of elongated magnetic memory components; c. a first plurality of depressions 24 arranged substantially in parallel with each other and aligned in one direction in the surface of said keeper, for holding said magnetic memory components therein; d. a plurality of word wires 25 arranged within said keeper and intersecting with said magnetic memory components; e. a sense wire and a digit wire threaded through each of the said magnetic memory components; and f. a second plurality of depressions 22 which are substantially parallel with each other and aligned in another direction from the alignment of the first plurality of depressions, the second depressions being on both sides of said word wires 25 on the keeper 23 and intersecting with said depressions 24 for defining magnetic flux paths around memory cells.
Claim 3
Dependent Claim 32 words
The magnetic memory matrix of claim 1, wherein said magnetic memory components are selected from the group consisting of components in the shape of tubes, plate bars, rods, and plated thin-film wires.
Claim 4
Dependent Claim 30 words
The magnetic memory matrix of claim 1, wherein said magnetic material of said keeper is selected from the group of materials having nonlinear magnetic characteristics and soft magnetic material characteristics.
Claim 5
Dependent Claim 53 words
The magnetic memory matrix of claim 1, wherein each of the said depressions 22 for defining magnetic flux paths have a width which is slightly greater than the gap between the magnetic memory components and the keeper 23 and a depth which is slightly thicker than the thickness of the magnetic memory component.
Claim 6
Dependent Claim 251 words
A magnetic memory matrix comprising: a. a lower magnetic keeper 23 made of magnetic material having a high magnetic permeability; b. a plurality of elongated magnetic memory components; c. an upper magnetic keeper 26 covering said magnetic keeper 23; d. a first plurality of depressions 24 arranged substantially parallel and aligned in one direction on the surface of said lower keeper, for holding said magnetic memory components therein; e. a first plurality of word wires 25 arranged on the surface of said lower keeper defining intervals of memory cells and intersecting with said magnetic memory components; f. a sense wire and a digit wire threaded through each of the said magnetic memory components; g. a second plurality of word wires 32 arranged in the upper magnetic keeper 26 on its interface, the positions of the wires 26 corresponding with said word wires 25; h. a second plurality of depressions 22 which are substantially parallel to each other and aligned in another direction relative to the first said plurality of depressions, said second depressions being both sides of said word wires 25 on the keeper 23 intersecting with said depressions 24 for defining magnetic flux paths around said memory cells; and i. a plurality of depressions 31 in said upper magnetic keeper 26 which are substantially parallel to each other, said upper depressions 31 corresponding in alignment and going with said second plurality of depressions 22 on said keeper 23, for defining more effectively the magnetic flux paths around said memory cells.
Claim 7
Dependent Claim 251 words
A magnetic memory matrix comprising: a. a lower magnetic keeper 23 made of magnetic material having a high magnetic permeability; b. a plurality of elongated magnetic memory components; c. an upper magnetic keeper 26 covering said magnetic keeper 23; d. a first plurality of depressions 24 arranged substantially parallel and aligned in one direction on the surface of said lower keeper, for holding said magnetic memory components therein; e. a first plurality of word wires 25 arranged on the surface of said lower keeper defining intervals of memory cells and intersecting with said magnetic memory components; f. a sense wire and a digit wire threaded through each of the said magnetic memory components; g. a second plurality of word wires 32 arranged in the upper magnetic keeper 26 on its interface, the positions of the wires 26 corresponding with said word wires 25; h. a second plurality of depressions 22 which are substantially parallel to each other and aligned in another direction relative to the first said plurality of depressions, said second depressions being both sides of said word wires 25 on the keeper 23 intersecting with said depressions 24 for defining magnetic flux paths around said memory cells; and i. a plurality of depressions 31 in said upper magnetic keeper 26 which are substantially parallel to each other, said upper depressions 31 corresponding in alignment and going with said second plurality of depressions 22 on said keeper 23, for defining more effectively the magnetic flux paths around said memory cells.
Claim 8
Dependent Claim 26 words
A magnetic memory matrix of claim 5, wherein said word wires 32 provide return flux paths for the said word wires 25 of said keeper 23.
Claim 9
Dependent Claim 264 words
A magnetic memory matrix comprising: a. a lower keeper 33 made of magnetic material having a high magnetic permeability; b. a plurality of elongated magnetic memory components; c. an upper magnetic keeper 36 covering said lower magnetic keeper 33; d. a first plurality of substantially parallel depressions 24 arranged in one direction in the surface of said lower keeper 33 for holding said magnetic memory components therein; e. word wires 35 arranged, corresponding with the intervals of memory cells, to intersect with said magnetic memory components and on the surface of said lower keeper 33; f. a sense wire and a digit wire threaded through each magnetic memory component; g. word wires arranged on the surface of said upper magnetic keeper 36 corresponding in position with said word wires 35 and at the interface of the two keepers; h. a second plurality of substantially parallel depressions 32 provided in another direction relative to said first depressions and on both sides of said word wires 35 on the keeper 33; said second depressions intersecting with said first depressions 24 for defining magnetic flux paths around said memory cells; i. a first group of substantially parallel depressions 32'' provided in said upper magnetic keeper 36, corresponding in position with depressions 32 on the said keeper 33 and extending to the interface of the two keepers for defining more effectively magnetic flux paths around said memory cells; and j. a second group of substantially parallel depressions 24 on the interface of said upper magnetic keeper 36 intersecting with said depressions 32'' for holding said magnetic memory components.
Claim 10
Dependent Claim 264 words
A magnetic memory matrix comprising: a. a lower keeper 33 made of magnetic material having a high magnetic permeability; b. a plurality of elongated magnetic memory components; c. an upper magnetic keeper 36 covering said lower magnetic keeper 33; d. a first plurality of substantially parallel depressions 24 arranged in one direction in the surface of said lower keeper 33 for holding said magnetic memory components therein; e. word wires 35 arranged, corresponding with the intervals of memory cells, to intersect with said magnetic memory components and on the surface of said lower keeper 33; f. a sense wire and a digit wire threaded through each magnetic memory component; g. word wires arranged on the surface of said upper magnetic keeper 36 corresponding in position with said word wires 35 and at the interface of the two keepers; h. a second plurality of substantially parallel depressions 32 provided in another direction relative to said first depressions and on both sides of said word wires 35 on the keeper 33; said second depressions intersecting with said first depressions 24 for defining magnetic flux paths around said memory cells; i. a first group of substantially parallel depressions 32'' provided in said upper magnetic keeper 36, corresponding in position with depressions 32 on the said keeper 33 and extending to the interface of the two keepers for defining more effectively magnetic flux paths around said memory cells; and j. a second group of substantially parallel depressions 24 on the interface of said upper magnetic keeper 36 intersecting with said depressions 32'' for holding said magnetic memory components.

References Cited (Backward Citations)

US2926342A Cited
US3460113A Cited
US3470545A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1974-11-22 1975-05-24 1975-11-23 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1978-11-22 1979-05-24 1979-11-23 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1982-11-22 1983-05-24 1983-11-23 $7700.00 Window Closed / Lapsed

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