US3174138A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Memory elements using variable axis anisotropic magnetic thin film
Assignee: Unisys Corp
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Filing: 1960-09-23
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Granted: 1965-03-16
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Expires: 1980-09-23
Abstract
No abstract record available.
Inventors
- 👤 Thomas J Matcovich
- 👤 William E Flannery
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:30
CPC Classifications
G; G11; G11C; G11C11/00; G11C11/02; G11C11/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
138 words
A MAGNETIC MEMORY ELEMENT COMPRISING (A) A VERY THIN FILM OF VARIABLE ANISOTROPIC MAGNETIC AXIS CAPABLE OF HAVING ITS HARD AND EASY MAGNETIZATION DIRECTIONS SWITCHED TO NEW DIRECTIONS APPROXIMATELY AT RIGHT ANGLES THERETO BY THE APPLICATION OF A MAGNETIC FIELD AT THE NORMAL ENVIRONMENTAL TEMPERATURE, (B) WRITE IN AND READOUT COMMAND MEANS FOR PRODUCING MAGNETIC FIELDS IN THE FILM OF SUFFICIENT MAGNITUDE, DIRECTION AND DURATION TO TURN THE MAGNETIC AXIS TO THE NEW DIRECTION AT RIGHT ANGLES, (C) THE READOUT COMMAND MEANS BEING COMPOSED OF PULSES HAVING A MAGNITUDE AND DURATION LESS THAN THAT REQUIRED TO MOVE THE ANISOTROPIC MAGNETIC AXIS, AND (D) INDUCTIVE PICKUP MEANS ORIENTED WITH RESPECT TO THE TWO POSITIONS OF THE MAGNETIC AXIS WHEREBY ON RECEIPT OF READOUT PULSES AN OUTPUT SIGNAL IS PRODUCED WHICH DIFFERS DEPENDING ON THE ORIENTATION OF THE MAGNETIC AXIS.
Claim 2
Dependent Claim
138 words
A MAGNETIC MEMORY ELEMENT COMPRISING (A) A VERY THIN FILM OF VARIABLE ANISOTROPIC MAGNETIC AXIS CAPABLE OF HAVING ITS HARD AND EASY MAGNETIZATION DIRECTIONS SWITCHED TO NEW DIRECTIONS APPROXIMATELY AT RIGHT ANGLES THERETO BY THE APPLICATION OF A MAGNETIC FIELD AT THE NORMAL ENVIRONMENTAL TEMPERATURE, (B) WRITE IN AND READOUT COMMAND MEANS FOR PRODUCING MAGNETIC FIELDS IN THE FILM OF SUFFICIENT MAGNITUDE, DIRECTION AND DURATION TO TURN THE MAGNETIC AXIS TO THE NEW DIRECTION AT RIGHT ANGLES, (C) THE READOUT COMMAND MEANS BEING COMPOSED OF PULSES HAVING A MAGNITUDE AND DURATION LESS THAN THAT REQUIRED TO MOVE THE ANISOTROPIC MAGNETIC AXIS, AND (D) INDUCTIVE PICKUP MEANS ORIENTED WITH RESPECT TO THE TWO POSITIONS OF THE MAGNETIC AXIS WHEREBY ON RECEIPT OF READOUT PULSES AN OUTPUT SIGNAL IS PRODUCED WHICH DIFFERS DEPENDING ON THE ORIENTATION OF THE MAGNETIC AXIS.
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) | 1968-03-15 | 1968-09-14 | 1969-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-03-15 | 1972-09-14 | 1973-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-03-15 | 1976-09-14 | 1977-03-16 | $7700.00 | Window Closed / Lapsed |