US3739358A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shift register operating by propagation of domains in thin films of magnetic material
Assignee: TECH SYST INFORMATIQUES
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Filing: 1972-01-12
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Granted: 1973-06-12
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Expires: 1992-01-12
Abstract
Abstract A first zone of relatively low coercivity is surrounded by a second zone of relatively high coercivity in a thin film shift register, with the zones formed of magnetizable material, the first zone extending along the axis of relatively difficult magnetization and being divided from the second zone on opposite sides by first and second boundaries in the form of regular saw teeth, with the second axis being displaced relative to the first by half the width of a saw tooth.
Inventors
- 👤 C Battarel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 07:15
CPC Classifications
G; G11; G11C; G11C19/00; G11C19/02; G11C19/08; G11C19/0808; G11C19/0841; H; H01; H01F; H01F10/00; H01F10/06
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
157 words
A shift register on a non-magnetic and electrically insulative base, said register comprising: thin film magnetizable material defining a first zone of relatively low coercivity surrounded by a second zone of relatively high coercivity, said first zone extending in the direction of the axis of relatively difficult magnetization and being divided from the second zone on respective opposite sides by first and second boundaries each boundary being formed by periodically repeating divisions comprising a first segment at an acute angle with respect to said axis, a second segment perpendicular to said axis, a third segment parallel to said axis and a fourth segment perpendicular to said axis wherein one of the end points of said first and fourth segments lie along a line parallel to said axis, said boundaries being symmetrical with respect to the axis but the second displaced relative to the first along the axis by the distance to the mid-point of the first segment.
Claim 2
Dependent Claim
157 words
A shift register on a non-magnetic and electrically insulative base, said register comprising: thin film magnetizable material defining a first zone of relatively low coercivity surrounded by a second zone of relatively high coercivity, said first zone extending in the direction of the axis of relatively difficult magnetization and being divided from the second zone on respective opposite sides by first and second boundaries each boundary being formed by periodically repeating divisions comprising a first segment at an acute angle with respect to said axis, a second segment perpendicular to said axis, a third segment parallel to said axis and a fourth segment perpendicular to said axis wherein one of the end points of said first and fourth segments lie along a line parallel to said axis, said boundaries being symmetrical with respect to the axis but the second displaced relative to the first along the axis by the distance to the mid-point of the first segment.
Claim 3
Dependent Claim
36 words
The register as claimed in claim 1, in which the second zone material is an alloy of cobalt and phosphorous partially overlying the first zone and having a thickness of from 500 to 800 Angstrom units.
Claim 4
Dependent Claim
38 words
The register as claimed in claim 1 wherein the line parallel to said axis for said first and second boundaries are separated by a distance in the order of one-half to twice the length of said first segment.
Claim 5
Dependent Claim
28 words
The register as claimed in claim 3 wherein the distance between the second and fourth segments is of the order of one-third the length of said first segment.
Claim 6
Dependent Claim
28 words
The register as claimed in claim 1 wherein the distance between the second and fourth segments is of the order of one-third the length of said first segment.
Claim 7
Dependent Claim
44 words
The register as claimed in claim 5 wherein the distance between said second and fourth segments is twelve microns, the length of said fourth segment is eighty microns, and the length of the projection of the first segment on said axis is twenty-three microns.
Claim 8
Dependent Claim
76 words
The register as claimed in claim 6 including means for advancing domains of magnetized material along the first zone from a division of one of said boundaries to the adjacent division of the other of said boundaries, said means comprising a first flat electrical conductor extending along the first zone parallel to the axis and a flat second electrical conductor of generally U shape embracing the first zone with its arms extending parallel to the axis.
Claim 9
Dependent Claim
76 words
The register as claimed in claim 1 including means for advancing domains of magnetized material along the first zone from a division of one of said bOundaries to the adjacent division of the other of said boundaries, said means comprising a first flat electrical conductor extending along the first zone parallel to the axis and a flat second electrical conductor of generally U shape embracing the first zone with its arms extending parallel to the axis.
Claim 10
Dependent Claim
41 words
The register as claimed in claim 8, comprising a write-in section formed as one end of the first zone, the second conductor being so arranged that that portion linking its arms extends perpendicularly of the axis to cover the write-in section.
Claim 11
Dependent Claim
34 words
A register as claimed in claim 8, comprising a write-in section formed as one end of the first zone and a third electrical conductor extending perpendicularly of the axis to cover the write-in section.
Claim 12
Dependent Claim
41 words
The register as claimed in claim 10, comprising a write-in section formed as one end of the first zone, the second conductor being so arranged that that portion linking its arms extends perpendicularly of the axis to cover the write-in section.
Claim 13
Dependent Claim
41 words
The register as claimed in claim 1, wherein: the material of the first zone is a ternary alloy of iron, nickel and cobalt including from 50 to 70 percent nickel, 5 to 25 percent iron and 10 to 30 percent cobalt.
Claim 14
Dependent Claim
22 words
The register as claimed in claim 12, in which the alloy contains 62 percent nickel, 15.5 percent iron and 22.5 percent cobalt.
Claim 15
Dependent Claim
25 words
The register as claimed in claim 13, in which the thickness of the material of the first zone is between 850 and 1100 Angstrom units.
Claim 16
Dependent Claim
36 words
The register as claimed in claim 14, in which the second zone material is an alloy of cobalt and phosphorous partially overlying the first zone and having a thickness of from 500 to 800 Angstrom units.
Claim 17
Dependent Claim
17 words
The register as claimed in claim 1, wherein said acute angle is between 20 and 60 degrees.
Claim 18
Dependent Claim
28 words
The register as claimed in claim 16 wherein the distance between the second and fourth segments is of the order of one-third the length of said first segment.
Claim 19
Dependent Claim
38 words
The register as claimed in claim 16 wherein the line parallel to said axis for said first and second boundaries are separated by a distance in the order of one-half to twice the length of said first segment.
Claim 20
Dependent Claim
76 words
The register as claimed in claim 18 including means for advancing domains of magnetized material along the first zone from a division of one of said boundaries to the adjacent division of the other of said boundaries, said means comprising a first flat electrical conductor extending along the first zone parallel to the axis and a flat second electrical conductor of generally U shape embracing the first zone with its arms extending parallel to the axis.
Claim 21
Dependent Claim
28 words
The register as claimed in claim 18 wherein the distance between the second and fourth segments is of the order of one-third the length of said first segment.
References Cited (Backward Citations)
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 |