US3553659A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Biemitter transistor search memory array
Assignee: Unisys Corp
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Filing: 1968-12-11
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Granted: 1971-01-05
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Expires: 1988-12-11
Abstract
Abstract A SEARCH MEMORY UTILIZING TWO CROSS-COUPLED BIEMITTER TRANSISTORS AS THE STORAGE ELEMENTS STORING THE TRUE AND THE COMPLEMENT OF EACH BIT OF THE MULTIBIT DESIGNATOR WORDS HELD IN THE SEARCH MEMORY. THE STORAGE ELEMENTS ARE ARRANGED AT THE INTERSECTIONS OF ORTHOGONAL SETS OF PARALLEL BIT LINE PAIRS AND SETS OF PARALLEL WORD-SENSE LINES WITH THE TWO EMITTERS OF EACH TRANSISTOR COUPLED TO THE INTERSECTING BIT AND WORD-SENSE LINES, RESPECTIVELY. INTERROGATION OF THE DESIGNATOR WORDS IS ALONG THE BIT LINES PRODUCING MATCH/MISMATCH OUTPUT SIGNALS ALONG THE WORD-SENSE LINES.
Inventors
- 👤 Robert M Englund
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 20:40
CPC Classifications
G; G11; G11C; G11C15/00; G11C15/04; H; H03; H03K; H03K3/00; H03K3/02; H03K3/26; H03K3/28; H03K3/281; H03K3/286; H03K3/288
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) | 1974-01-04 | 1974-07-06 | 1975-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-04 | 1978-07-06 | 1979-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-04 | 1982-07-06 | 1983-01-05 | $7700.00 | Window Closed / Lapsed |