Patent US3339179A successfully refreshed from Google Patents.
US3094685A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Non-destructive readout system
Assignee: International Business Machines Corp
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Filing: 1957-09-30
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Granted: 1963-06-18
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Expires: 1977-09-30
Abstract
No abstract record available.
Inventors
- 👤 James W Crowe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:05
CPC Classifications
G; G11; G11C; G11C11/00; G11C11/21; G11C11/44; Y; Y10; Y10S; Y10S505/00; Y10S505/825; Y10S505/831; Y10S505/833; Y10S505/842; Y10S505/843
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
120 words
MEANS FOR NON-DESTRUCTIVELY INTERROGATING THE BINARY STATE OF A SUPERCONDUCTIVE MEMORY CELL HAVING A PREDETERMINED HEAT RELAXATION TIME AND WHEREIN THE PRESENCE OF A PERSISTENT CURRENT IN SAID CELL REPRESENTS THE STORAGE OF A FIRST BINARY STATE AND THE ABSENCE OF A PERSISTENT CURRENT REPRESENTS THE STORAGE OF ITS SECOND BINARY STATE, COMPRISING MEANS FOR APPLYING A MAGNETIC FIELD TO SAID SUPERCONDUCTIVE CELL OF SUFFICIENT MAGNITUDE TO DRIVE THE LATTER TO ITS RESISTIVE STATE WHEN IT IS IN ITS SECOND BINARY STATE BUT OF INSUFFICIENT MAGNITUDE TO DRIVE SAID SUPERCONDUCTIVE CELL TO ITS RESISTIVE STATE WHEN IT IS IN ITS FIRST BINARY STATE, MEANS FOR TERMINATING SAID APPLIED FIELD AT A TIME THAT IS LESS THAN SAID HEAT RELAXATION TIME.
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) | 1966-06-17 | 1966-12-17 | 1967-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-06-17 | 1970-12-17 | 1971-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-06-17 | 1974-12-17 | 1975-06-18 | $7700.00 | Window Closed / Lapsed |