US3739357A
Expired / Lapsed
US
⏱️ 0.0 years remaining
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 14:22
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)
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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 |