Patent US3739357A successfully refreshed from Google Patents.
US3739357A
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Magnetic shift memory
Assignee: FILMFAB WOLFEN FOTOCHEM KOM VE
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Filing: 1970-12-04
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Granted: 1973-06-12
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Expires: 1990-12-04
Abstract
Abstract This invention relates to a magnetic shift memory for example in the form of a long ribbon, preferably endless, wherein the required raster of varying magnetic fields is provided in a permanent magnetic layer arranged adjacent to strips of magnetic material and sufficiently close thereto for causing on application of an impulse shaped current, a raster-like periodic variation of the critical switching field strength. The periodicity of the raster-like magnetization need not be constant. It may extend longitudinally and/or transversely and/or at an angle relative to the permanent magnetic layer.
Inventors
- 👤 R Straubel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:36
CPC Classifications
G; G11; G11C; G11C19/00; G11C19/02; G11C19/08; G11C19/0808; G11C19/0841
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
127 words
In a shift register of the type comprising a strip of magnetic storage material within which magnetic domains may be stored, and wherein means are provided for producing a periodic pulsatory field positioned to effect the shifting of domains stored in said storage material; the improvement comprising a permanent magnetic layer of a hard magnetic material, said permanent magnetic layer having recorded therein a periodic magnetic pattern forming a raster, and having a stray magnetic field, said strip being fixedly positioned in said stray field whereby the stray magnetic field produces a periodic variation in the article switching field strength of said strip, said means producing a periodic pulsatory field comprising non-position dependent means for producing a field which influences the strip substantially uniformly throughout its length.
Claim 2
Dependent Claim
127 words
In a shift register of the type comprising a strip of magnetic storage material within which magnetic domains may be stored, and wherein means are provided for producing a periodic pulsatory field positioned to effect the shifting of domains stored in said storage material; the improvement comprising a permanent magnetic layer of a hard magnetic material, said permanent magnetic layer having recorded therein a periodic magnetic pattern forming a raster, and having a stray magnetic field, said strip being fixedly positioned in said stray field whereby the stray magnetic field produces a periodic variation in the article switching field strength of said strip, said means producing a periodic pulsatory field comprising non-position dependent means for producing a field which influences the strip substantially uniformly throughout its length.
Claim 3
Dependent Claim
24 words
The shift register of claim 1, wherein the periodic magnetic pattern in said permanent magnetic layer has a variable periodicity along said strip means.
Claim 4
Dependent Claim
18 words
The shift register of claim 1 wherein said permanent magnetic layer is comprised of a plurality of laminae.
Claim 5
Dependent Claim
21 words
The shift register of claim 1 further comprising a substrate of an elastic material for supporting said strip and said layer.
Claim 6
Dependent Claim
19 words
The shift register of claim 1 wherein said strip and said layer are in the form of endless bands.
Claim 7
Dependent Claim
46 words
The shift register of claim 1 wherein said means for providing a pulsatory field comprises a source of a pulsatory current, and a conductive strip connected to said source and positioned whereby the field produced by said current effects the shifting of domains in said strip.
Claim 8
Dependent Claim
18 words
The shift register of claim 6 wherein said electrically conducting layer is positioned in contact with said strip.
References Cited (Backward Citations)
US3140471A
Cited
US3148360A
Cited
US3295114A
Cited
US3456248A
Cited
US3483534A
Cited
US3540020A
Cited
US3553661A
Cited
US3438016A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-06-11 | 1976-12-11 | 1977-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-11 | 1980-12-11 | 1981-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-11 | 1984-12-11 | 1985-06-12 | $7700.00 | Window Closed / Lapsed |