US3195115A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic data storage devices
Assignee: International Computers and Tabulators Ltd
•
Filing: 1962-07-13
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Granted: 1965-07-13
•
Expires: 1982-07-13
Abstract
No abstract record available.
Inventors
- 👤 Bradley Edward Michael
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 02:05
CPC Classifications
G; G11; G11C; G11C17/00; G11C17/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
164 words
A NON-ERASABLE STORE FOR BINARY INFORMATION INCLUDING A GROUP OF STORAGE ELEMENTS, EACH STORAGE ELEMENT CONSISTING OF AN AREA OF THIN FERROMAGNETIC FILM WITH MUTUALLY PERPENDICULAR HARD AND EASY AXES OF MAGNETISATION AND WHICH IS SWITCHABLE PRIMARILY BY DOMAIN ROTATION; A SEPARATE SENSE CONDUCTOR COUPLED TO EACH OF THE STORAGE ELEMENTS RESPECTIVELY, EACH SENSE CONDUCTOR BEING RESPONSIVE TO CHANGE OF MAGNETIC FLUX IN THE DIRECTION OF THE EASY AXIS OF THE STORAGE ELEMENT COUPLED THERETOF A PLURALITY OF ELEMENTS OF PERMANENTLY MAGNETISED MATERIAL POSITIONED ONE ADJACENT EACH STORAGE ELEMENT TO APPLY TO EACH STORAGE ELEMENT A BIAS FIELD HAVING A COMPONENT ALIGNED WITH THE EASY AXIS; AND MEANS TO APPLY A DRIVE FIELD HAVING A MAJOR COMPONENR IN THE HARD AXIS DIRECTION TO ALL THE STORAGE ELEMENTS TO INDUCE SIGNALS IN THE SENSE CONDUCTORS REPRESENTATIVE OF THE PREVIOUS MAGNETIC STATES OF THE ELEMENTS, THE BIAS FIELD BEING EFFECTIVE TO RETURN THE STORAGE ELEMENTS TO THEIR PREVIOUS MAGNETIC STATES ON TERMINATION OF THE DRIVE FIELD.
Claim 2
Dependent Claim
164 words
A NON-ERASABLE STORE FOR BINARY INFORMATION INCLUDING A GROUP OF STORAGE ELEMENTS, EACH STORAGE ELEMENT CONSISTING OF AN AREA OF THIN FERROMAGNETIC FILM WITH MUTUALLY PERPENDICULAR HARD AND EASY AXES OF MAGNETISATION AND WHICH IS SWITCHABLE PRIMARILY BY DOMAIN ROTATION; A SEPARATE SENSE CONDUCTOR COUPLED TO EACH OF THE STORAGE ELEMENTS RESPECTIVELY, EACH SENSE CONDUCTOR BEING RESPONSIVE TO CHANGE OF MAGNETIC FLUX IN THE DIRECTION OF THE EASY AXIS OF THE STORAGE ELEMENT COUPLED THERETOF A PLURALITY OF ELEMENTS OF PERMANENTLY MAGNETISED MATERIAL POSITIONED ONE ADJACENT EACH STORAGE ELEMENT TO APPLY TO EACH STORAGE ELEMENT A BIAS FIELD HAVING A COMPONENT ALIGNED WITH THE EASY AXIS; AND MEANS TO APPLY A DRIVE FIELD HAVING A MAJOR COMPONENR IN THE HARD AXIS DIRECTION TO ALL THE STORAGE ELEMENTS TO INDUCE SIGNALS IN THE SENSE CONDUCTORS REPRESENTATIVE OF THE PREVIOUS MAGNETIC STATES OF THE ELEMENTS, THE BIAS FIELD BEING EFFECTIVE TO RETURN THE STORAGE ELEMENTS TO THEIR PREVIOUS MAGNETIC STATES ON TERMINATION OF THE DRIVE FIELD.
References Cited (Backward Citations)
US3070783A
Cited
US3113297A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-07-12 | 1969-01-11 | 1969-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-07-12 | 1973-01-11 | 1973-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-07-12 | 1977-01-11 | 1977-07-13 | $7700.00 | Window Closed / Lapsed |