Patent US3142048A successfully refreshed from Google Patents.
US3142048A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic memory circuit
Assignee: AT&T Inc
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Filing: 1960-12-16
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Granted: 1964-07-21
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Expires: 1980-12-16
Abstract
No abstract record available.
Inventors
- 👤 James L Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 11:19
CPC Classifications
G; G11; G11C; G11C11/00; G11C11/02; G11C11/10; G11C11/04; G11C11/12
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
121 words
A MEMORY DEVICE COMPRISING A HELICAL FIRST MAGNETIC ELEMENT HAVING SUBSTANTIALLY RECTANGULAR HYSTERESIS CHARACTERISTICS, A FIRST ACCESS WIRE AXIALLY COINCIDENT WITH SAID FIRST MAGNETIC ELEMENT, A SECOND ACCESS WIRE ARRANGED ORTHOGONALLY TRANSVERSE TO SAID FIRST ACCESS WIRE, SAID ACCESS WIRES DEFINING AN INFORMATION ADDRESS ON SAID FIRST MAGNETIC ELEMENT AT THEIR INTERSECTION, MEANS FOR APPLYING COINCIDENT CURRENT PULSES TO SAID ACCESS WIRES FOR INDUCING A REMANENT FLUX IN SAID FIRST MAGNETIC ELEMENT AT SAID INFORMATION ADDRESS REPRESENTATIVE OF A BINARY INFORMATION BIT AND A SECOND MAGNETIC ELEMENT HAVING A HIGH MAGNETIC PERMEABILITY DISPOSED AT SAID INTERSECTION OF SAID ACCESS WIRES AND SO INDUCTIVELY COUPLED TO SAID FIRST MAGNETIC ELEMENT AS TO PROVIDE A LOW RELUCTANCE CLOSURE PATH FOR SAID REMANENT FLUX.
References Cited (Backward Citations)
US2825891A
Cited
US2911627A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-07-21 | 1968-01-20 | 1968-07-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-07-21 | 1972-01-20 | 1972-07-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-07-21 | 1976-01-20 | 1976-07-21 | $7700.00 | Window Closed / Lapsed |