USRE27239E
Expired / Lapsed
US
⏱️ 0.0 years remaining
Memory system
Assignee: —
•
Filing: 1968-11-14
•
Granted: 1971-11-23
•
Expires: 1988-11-14
Abstract
Abstract I DISCLOSE APPARATUS FOR PROTECTING THE STORAGE OF INFORMATION IN THE MEMORY REGISTERS OF A DATA PROCESSOR. EACH REGISTER IS PROVIDED WITH AN EXTRA ("KEY DATA") BIT WHICH MAY BE SET TO INDICATE THAT THE INFORMATION CONTAINED IN THE REGISTER HAS A DEGREE OF IMPORTANCE SUCH THAT IT IS NOT TO BE CASUALLY OVER-WRITTEN BY A ORDINARY ORDER TO WRITE NEW INFORMATION. CIRCUITRY IS PROVIDED WHICH IS CAPABLE OF RESPONDING TO A SPECIAL CONTROL SIGNAL FOR OVERRIDING THE APPEARANCE OF A SET KEY DATA BIT. IN THIS WAY IT IS POSSIBLE TO ALTER THE INFORMATION CONTENT OF THE REGISTER BY PROGRAM COMMAND WHEN IT IS IN FACT DESIRED TO DO DO.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:16
CPC Classifications
G; G06; G06F; G06F12/00; G06F12/14; G06F12/1416; G06F12/1425
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-22 | 1975-05-24 | 1975-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-22 | 1979-05-24 | 1979-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-22 | 1983-05-24 | 1983-11-23 | $7700.00 | Window Closed / Lapsed |