US4232377A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Memory preservation and verification system
Assignee: Micron Technology Inc
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Filing: 1979-04-16
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Granted: 1980-11-04
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Expires: 1999-04-16
Abstract
Abstract A memory preservation and verification system is provided in which memory contents are verified as being valid following an interruption and subsequent reapplication of operating power. A backup power supply is provided to maintain the status of the memory contents during the interruption or loss of a main power supply. First and second mathematically related numbers are generated and stored in memory locations. These numbers are subsequently retrieved and the mathematical relationship therebetween checked to provide the verification of the status of data in the memory.
Inventors
- 👤 James L. Tallman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:54
CPC Classifications
G; G06; G06F; G06F11/00; G06F11/07; G06F11/16; G06F11/1666; G06F11/167; G06F11/0703; G06F11/0751; G06F11/0763; G06F11/14; G06F11/1402; G06F11/1415; G06F11/1441; G06F11/20; G06F11/2015
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
118 words
A memory preservation and verification system comprising: power supply means coupled to said memory for energization thereof, said power supply means including a main power supply and a backup power supply; means for generating a first digital number; process and control logic means for generating a second digital number and storing both of said first and second digital numbers in said memory, said second digital number being mathematically related to said first digital number; said process and control logic means also for retrieving said first and second digital numbers and checking the relationship therebetween to thereby provide a verification of the validity of the contents of said memory; and utilization means for providing an indication of said verification.
Claim 2
Dependent Claim
118 words
A memory preservation and verification system comprising: power supply means coupled to said memory for energization thereof, said power supply means including a main power supply and a backup power supply; means for generating a first digital number; process and control logic means for generating a second digital number and storing both of said first and second digital numbers in said memory, said second digital number being mathematically related to said first digital number; said process and control logic means also for retrieving said first and second digital numbers and checking the relationship therebetween to thereby provide a verification of the validity of the contents of said memory; and utilization means for providing an indication of said verification.
Claim 3
Dependent Claim
47 words
A memory preservaton and verification system in accordance with claim 1 wherein said power supply means further includes switch means for coupling one of said main power supply and backup power supply to said memory and switching to the other of said power supplies under predetermined conditions.
References Cited (Backward Citations)
US4122359A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-11-04 | 1984-05-05 | 1984-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-11-04 | 1988-05-05 | 1988-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-11-04 | 1992-05-05 | 1992-11-04 | $7700.00 | Window Closed / Lapsed |