US3213431A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bilayer magnetic device operating as a single layer device
Assignee: NCR Voyix Corp
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Filing: 1960-12-21
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Granted: 1965-10-19
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Expires: 1980-12-21
Abstract
No abstract record available.
Inventors
- 👤 Jr Anthony J Kolk
- 👤 Larry J Douglas
- 👤 Donal A Meier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:36
CPC Classifications
B; B82; B82Y; B82Y25/00; H; H01; H01F; H01F10/00; H01F10/08; H01F10/10; H01F10/32; H03; H03K; H03K3/00; H03K3/02; H03K3/45
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
140 words
A BISTABLE MAGNETIC DEVICE COMPRISING A BASE HAVING AN ELECTRICALLY CONDUCTIVE SURFACE, A FIRST THIN LAYER OF SUBSTANTIALLY RECTANGULAR HYSTERESIS LOOP MAGNETIC MATERIAL UNIFORMLY DISPOSED OVER SAID SURFACE AND A SECOND THIN LAYER OF A DIFFERENT SUBSTANTIALLY RECTANGULAR HYSTERESIS LOOP MAGNETIC MATERIAL UNIFORMLY DISPOSED OVER AND IN DIRECT INTIMATE CONTACT WITH SAID FIRST LAYER SO THAT THE MULTILAYER EXHIBITS A RECTANGULAR HYSTERESIS CHARACTERISTIC SUBSTANTIALLY OF THE FORM OBTAINED FOR A SINGLE LAYER FILM, ONE OF THE LAYERS BEING OF AN IRON ALLOY INCLUDING AT LEAST 90% IRON BY WEIGHT AND THE OTHER OF SAID LAYERS BEING OF AND IRON ALLOY INCLUDING NO MORE THAN 70% IRON BY WEIGHT, THE THICKNESSES OF SAID LAYERS BEING CHOSEN SO THAT THE COMPOSITE MULTILAYER FILM HAS A SUBSTANTIALLY RECTANGULAR HYSTERESIS LOOP WITH A COERCIVITY INTERMEDIATE THE COERCIVITIES OF SAID FIRST AND SECOND MAGNETIC MATERIALS.
Claim 2
Dependent Claim
140 words
A BISTABLE MAGNETIC DEVICE COMPRISING A BASE HAVING AN ELECTRICALLY CONDUCTIVE SURFACE, A FIRST THIN LAYER OF SUBSTANTIALLY RECTANGULAR HYSTERESIS LOOP MAGNETIC MATERIAL UNIFORMLY DISPOSED OVER SAID SURFACE AND A SECOND THIN LAYER OF A DIFFERENT SUBSTANTIALLY RECTANGULAR HYSTERESIS LOOP MAGNETIC MATERIAL UNIFORMLY DISPOSED OVER AND IN DIRECT INTIMATE CONTACT WITH SAID FIRST LAYER SO THAT THE MULTILAYER EXHIBITS A RECTANGULAR HYSTERESIS CHARACTERISTIC SUBSTANTIALLY OF THE FORM OBTAINED FOR A SINGLE LAYER FILM, ONE OF THE LAYERS BEING OF AN IRON ALLOY INCLUDING AT LEAST 90% IRON BY WEIGHT AND THE OTHER OF SAID LAYERS BEING OF AND IRON ALLOY INCLUDING NO MORE THAN 70% IRON BY WEIGHT, THE THICKNESSES OF SAID LAYERS BEING CHOSEN SO THAT THE COMPOSITE MULTILAYER FILM HAS A SUBSTANTIALLY RECTANGULAR HYSTERESIS LOOP WITH A COERCIVITY INTERMEDIATE THE COERCIVITIES OF SAID FIRST AND SECOND MAGNETIC MATERIALS.
References Cited (Backward Citations)
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Cited
US3083353A
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US3069661A
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GB854153A
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US2984825A
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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) | 1968-10-18 | 1969-04-19 | 1969-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-10-18 | 1973-04-19 | 1973-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-10-18 | 1977-04-19 | 1977-10-19 | $7700.00 | Window Closed / Lapsed |