Patent US4651323A successfully refreshed from Google Patents.
US4651323A
Expired / Lapsed
US
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Fault protection flip flop
Assignee: TADEM COMPUTERS Inc A CORP OF
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Filing: 1983-11-14
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Granted: 1987-03-17
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Expires: 2003-11-14
Abstract
Abstract The disclosure relates to the use of a flip flop or the like to provide additional protection against the destruction of data located in microprocessor system support circuits.
Inventors
- 👤 William R. Goodman
- 👤 Kenneth G. Koenig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 18:27
CPC Classifications
G; G06; G06F; G06F11/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
113 words
A memory protect system for protecting an area of critical data in an electronic memory against unauthorized read and write operations, comprising (a) memory means for recording whether read and write operations are authorized for the area of critical data; (b) means for altering said memory means to indicate that a fixed number of read and write operations are authorized for the area of critical data; and (c) means for preventing read and write operations to the area of critical data when said memory means does not indicate that read and write operations are authorized, by disabling an enable signal to cause operations on the area of critical data to not be performed.
Claim 2
Dependent Claim
113 words
A memory protect system for protecting an area of critical data in an electronic memory against unauthorized read and write operations, comprising (a) memory means for recording whether read and write operations are authorized for the area of critical data; (b) means for altering said memory means to indicate that a fixed number of read and write operations are authorized for the area of critical data; and (c) means for preventing read and write operations to the area of critical data when said memory means does not indicate that read and write operations are authorized, by disabling an enable signal to cause operations on the area of critical data to not be performed.
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) | 1990-03-16 | 1990-09-15 | 1991-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-03-16 | 1994-09-15 | 1995-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-03-16 | 1998-09-15 | 1999-03-17 | $7700.00 | Window Closed / Lapsed |