Patent US3404382A successfully refreshed from Google Patents.
US3404382A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Capacitive semi-permanent memory
Assignee: Lear Siegler Inc
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Filing: 1964-10-19
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Granted: 1968-10-01
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Expires: 1984-10-19
Abstract
No abstract record available.
Inventors
- 👤 Albert D Rosenheck
- 👤 Douglas R Maure
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:37
CPC Classifications
G; G11; G11C; G11C17/00; G11C17/04
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
140 words
THE CAPACITIVE READ-ONLY MEMORY OF CLAIM 1 WHEREIN SAID SWITCH MEANS COUPLED TO EACH ADDRESS LINE COMPRISES: A FIRST SWITCHING ELEMENT COUPLING THE ADDRESS LINE TO THE GROUND POTENTIAL SOURCE; A SECOND SWITCHING ELEMENT COUPLING THE ADDRESS LINE TO THE DRIVE POTENTIAL SOURCE; BOTH SAID FIRST AND SAID SECOND SWITCHING ELEMENTS BEING RESPONSIVE TO APPLIED SIGNALS FOR CLOSING OR OPENING A CONDUCTIVE PATH OF THE ADDRESS LINE FROM THEIR RESPECTIVE POTENTIAL SOURCES; MEANS FOR APPLYING A BIAS SIGNAL FOR MAINTAINING SAID FIRST SWITCHING ELEMENT CLOSED TO THE GROUND POTENTIAL SOURCE AND SAID SECOND SWITCHING ELEMENT OPEN; AND MEANS RESPONSIVE TO THE MEANS FOR MOMENTARILY ACTUATING ONE OF SAID SWITCH MEANS FOR GENERATING A SHORT DURATION SWITCHING SIGNAL TO EACH OF SAID SWITCHING ELEMENTS TO OPEN SAID FIRST SWITCHING ELEMENT AND CLOSE SAID SECOND SWITCHING ELEMENT TO THE DRIVE POTENTIAL SOURCE.
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) | 1971-10-01 | 1972-04-01 | 1972-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-10-01 | 1976-04-01 | 1976-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-10-01 | 1980-04-01 | 1980-10-01 | $7700.00 | Window Closed / Lapsed |