Patent US3820090A successfully refreshed from Google Patents.
US3820090A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bistable magnetic device
Assignee: Individual
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Filing: 1972-04-25
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Granted: 1974-06-25
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Expires: 1992-04-25
Abstract
Abstract A bistable ferromagnetic wire of generally uniform composition having a central relatively ''''soft'''' core portion and an outer relatively ''''hard'''' magnetized shell portion with relatively low and high coercivity respectively and whereby (a) the magnetized shell portion is operable for magnetizing the core portion in a first direction, (b) the magnetization of the core portion is reversible by application of a separate magnetic field and (c) the shell portion is operable to remagnetize the core portion in the first direction upon removal of the separate magnetic field.
Inventors
- 👤 J Wiegand
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:03
CPC Classifications
H; H03; H03K; H03K3/00; H03K3/02; H03K3/45; G; G06; G06K; G06K7/00; G06K7/08; G06K7/082; G06K7/083; G11; G11C; G11C11/00; G11C11/56; G11C11/5607; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/0302; H01F1/0304; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10S428/9265; Y10S428/928; Y10T; Y10T428/00; Y10T428/12; Y10T428/12465
Claims Analysis
Total Claims: 34
Claim 1
Independent Claim
100 words
A unitary magnetic device having first and second magnetic portions, at least said first portion being capable of retaining net magnetization after being subjected to a magnetic field, the net coercivity of said first portion being substantially greater than the net coercivity of said second portion, said first portion having substantially the same chemical composition as does said second portion, said portions being separated solely by a magnetic domain interface when said first portion has a net magnetization in a first direction and said second portion has a net magnetization in a second direction substantially opposite from said first direction.
Claim 2
Dependent Claim
100 words
A unitary magnetic device having first and second magnetic portions, at least said first portion being capable of retaining net magnetization after being subjected to a magnetic field, the net coercivity of said first portion being substantially greater than the net coercivity of said second portion, said first portion having substantially the same chemical composition as does said second portion, said portions being separated solely by a magnetic domain interface when said first portion has a net magnetization in a first direction and said second portion has a net magnetization in a second direction substantially opposite from said first direction.
Claim 3
Dependent Claim
37 words
The device of claim 1 whrein said portions each have magnetic anisotropy energy, the easy axis of said anisotropy of said first portion being substantially parallel to the easy axis of said anisotropy of said second portion.
Claim 4
Dependent Claim
24 words
The device of claim 1 wherein said coercivity of said portions varies in a substantially continuous fashion throughout said portion and throughout said device.
Claim 5
Dependent Claim
37 words
The device of claim 3 wherein said portions each have magnetic anisotropy energy, the easy axis of said anisotropy of said first portion being substantially parallel to the easy axis of said anisotropy of said second portion.
Claim 6
Dependent Claim
17 words
The device of claim 1 wherein each of said portions has a generally uniform chemical composition throughout.
Claim 7
Dependent Claim
37 words
The device of claim 5 wherein said portions each have magnetic anisotropy energy, the easy axis of said anisotropy of said first portion being substantially parallel to the easy axis of said anisotropy of said second portion.
Claim 8
Dependent Claim
24 words
The device of claim 5 wherein said coercivity of said portions varies in a substantially continuous fashion throughout said portion and throughout said device.
Claim 9
Dependent Claim
37 words
The device of claim 7 wherein said portions each have magnetic anisotropy energy, the easy axis of said anisotropy of said first portion being substantially parallel to the easy axis of said anisotropy of said second portion.
Claim 10
Dependent Claim
14 words
The device of claim 1 wherein said magnetic domain interface is a domain wall.
Claim 11
Dependent Claim
36 words
The device of claim 9 wherein said portions each have magnetic anisotropy energy, the easy axis of said anisotropy of said portion being substantially parallel to the easy axis of said anisotropy of said second portion.
Claim 12
Dependent Claim
24 words
The device of claim 9 wherein said coercivity of said portions varies in a substantially continuous fashion throughout said portion and throughout said device.
Claim 13
Dependent Claim
37 words
The device of claim 11 wherein said portions each have magnetic anisotropy energy, The easy axis of said anisotropy of said first portion being substantially parallel to the easy axis of said anisotropy of said second portion.
Claim 14
Dependent Claim
17 words
The device of claim 9 wherein each of said portions has a generally uniform chemical composition throughout.
Claim 15
Dependent Claim
37 words
The device of claim 13 wherein said portions each have magnetic anisotropy energy, the easy axis of said anisotropy of said first portion being substantially parallel to the easy axis of said anisotropy of said second portion.
Claim 16
Dependent Claim
24 words
The device of claim 13 wherein said coercivity of said portions varies in a substantially continuous fashion throughout said portion and throughout said device.
Claim 17
Dependent Claim
37 words
The device of claim 15 wherein said portions each have magnetic anisotropy energy, the easy axis of said anisotropy of said first portion being substantially parallel to the easy axis of said anisotropy of said second portion.
Claim 18
Dependent Claim
100 words
A unitary magnetic wire device having shell and core magnetic portions, At least said shell portion being capable of retaining net magnetization after being subjected to a magnetic field, the net coercivity of said shell portion being substantially greater than the net coercivity of said core portion, said shell portion having substantially the same chemical composition as does said core portion, said portions being separated solely by a magnetic domain interface when said shell portion has a net magnetization in a first direction and said core portion has a net magnetization in a second direction substantially opposite from said direction.
Claim 19
Dependent Claim
100 words
A unitary magnetic wire device having shell and core magnetic portions, At least said shell portion being capable of retaining net magnetization after being subjected to a magnetic field, the net coercivity of said shell portion being substantially greater than the net coercivity of said core portion, said shell portion having substantially the same chemical composition as does said core portion, said portions being separated solely by a magnetic domain interface when said shell portion has a net magnetization in a first direction and said core portion has a net magnetization in a second direction substantially opposite from said direction.
Claim 20
Dependent Claim
27 words
The wire of claim 17 wherein said portions each have magnetic anisotropy energy, the easy axis of said anisotropy of both of said portions being substantially axial.
Claim 21
Dependent Claim
31 words
The wire of claim 17 wherein the magnitude of said coercivity of said portions varies in a substantially continuous fashion as a function of distance along the radius of said wire.
Claim 22
Dependent Claim
27 words
The wire of claim 19 wherein said portions each have magnetic anisotropy energy, the easy axis of said anisotropy of both of said portions being substantially axial.
Claim 23
Dependent Claim
17 words
The wire of claim 17 wherein each of said portions has a generally uniform chemical composition throughout.
Claim 24
Dependent Claim
27 words
The wire of claim 21 wherein said portions each have magnetic anisotropy energy, the easy axis of said anisotropy of both of said portions being substantially axial.
Claim 25
Dependent Claim
31 words
The wire of claim 21 wherein the magnitude of said coercivity of said portions varies in a substantially continuous fashion as a function of distance along the radius of said wire.
Claim 26
Dependent Claim
27 words
The wire of claim 23 wherein said portions each have magnetic anisotropy energy, the easy axis of said anisotropy of both of said portions being substantially axial.
Claim 27
Dependent Claim
14 words
The wire of claim 17 wherein said magnetic domain interface is a domain wall.
Claim 28
Dependent Claim
27 words
The wire of claim 25 wherein said portions each have magnetic anisotropy energy, the easy axis of said anisotropy of both of said portions being substantially axial.
Claim 29
Dependent Claim
31 words
The wire of claim 25 wherein the magnitude of said coercivity of said portions varies in a substantially continuous fashion as a function of distance along the radius of said wire.
Claim 30
Dependent Claim
27 words
The wire of claim 27 wherein said portions each have magnetic anisotropy energy, the easy axis of said anisotropy of both of said portions being substantially axial.
Claim 31
Dependent Claim
17 words
The wire of claim 25 wherein each of said portions has a generally uniform chemical composition throughout.
Claim 32
Dependent Claim
27 words
The wire of claim 29 wherein said portions each have magnetic anisotropy energy, the easy axis of said anisotropy of both of said portions being substantially axial.
Claim 33
Dependent Claim
31 words
The wire of claim 29 wherein the magnitude of said coercivity of said portions varies in a substantially continuous fashion as a function of distance along the radius of said wire.
Claim 34
Dependent Claim
27 words
The wire of claim 31 wherein said portions each have magnetic anisotropy energy, the easy axis of said anisotropy of both of said portions being substantially axial.
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) | 1977-06-24 | 1977-12-24 | 1978-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-24 | 1981-12-24 | 1982-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-24 | 1985-12-24 | 1986-06-25 | $7700.00 | Window Closed / Lapsed |