Patent US3555515A successfully refreshed from Google Patents.
US3555515A
Expired / Lapsed
US
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Memory system having associative cells for marking locations
Assignee: Unisys Corp
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Filing: 1968-06-27
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Granted: 1971-01-12
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Expires: 1988-06-27
Abstract
Abstract APPARATUS FOR LOCATING AND WRITING IN AN EMPTY MEMORY LOCATION OF AN ASSOCIATIVE MEMORY. AN EXTRA CELL IS ADDED TO EACH MEMORY LOCATION TO MARK THE LOCATION AS FULL OR EMPTY.
Inventors
- 👤 Edwin S Lee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:45
CPC Classifications
H; H03; H03K; H03K3/00; H03K3/01; H03K3/013; G; G11; G11C; G11C15/00; G11C15/04; H03K3/02; H03K3/26; H03K3/28; H03K3/281; H03K3/286
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) | 1974-01-11 | 1974-07-13 | 1975-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-11 | 1978-07-13 | 1979-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-11 | 1982-07-13 | 1983-01-12 | $7700.00 | Window Closed / Lapsed |