Patent US3341830A successfully refreshed from Google Patents.
US3341830A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic memory drive circuits
Assignee: AT&T Inc
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Filing: 1964-05-06
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Granted: 1967-09-12
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Expires: 1984-05-06
Abstract
No abstract record available.
Inventors
- 👤 Jules R Conrath
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 09:56
CPC Classifications
G; G11; G11C; G11C7/00
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
118 words
AN ELECTRICAL CIRCUIT FOR GENERATING IN A FIRST OPERATIVE PHASE A BIPOLAR SIGNAL OF ONE AMPLITUDE AND IN A SECOND OPERATIVE PHASE A BIPOLAR SIGNAL OF A LESSER AMPLITUDE COMPRISING A MAGNETIC CORE HAVING A FIRST AND A SECOND SELECT WINDING, A BIASING WINDING, AND AN OUTPUT WINDING THEREON, MEANS FOR APPLYING A PARTIAL-SELECT CURRENT PULSE OF ONE POLARITY AND AMPLITUDE AND FOR A PREDETERMINED DURATION TO SAID FIRST SELECT WINDING DURING EACH OF SAID OPERATIVE PHASES, MEANS FOR APPLYING A PARTIAL-SELECT CURRENT PULSE OF SAID ONE POLARITY AND AMPLITUDE AND FOR SAID PREDETERMINED DURATION TO SAID SECOND SELECT WINDING DURING SAID FIRST OPERATIVE PHASE, MEANS FOR APPLYING A PARTIAL-SELECT CURRENT PULSE OF SAID ONE POLARITY BUT OF
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) | 1970-09-11 | 1971-03-13 | 1971-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-09-11 | 1975-03-13 | 1975-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-09-11 | 1979-03-13 | 1979-09-12 | $7700.00 | Window Closed / Lapsed |