US3594641A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Arrangement for indicating back currents in a diode matrix built up by means of bistable elements in the crossing points
Assignee: Telefonaktiebolaget LM Ericsson AB
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Filing: 1969-10-29
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Granted: 1971-07-20
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Expires: 1989-10-29
Abstract
Abstract Arrangement for indicating back currents in a viz. matrix built up by means of bistable elements in the crossing points. In diodes of the type generally used in diode matrices normally a certain back current is existing. As long as the back current is low it will not disturb the function of the diode matrix, but if it should be too high it can occur that faulty crossing points are indicated. The arrangement makes it possible to indicate back currents in a diode matrix of a special type, viz. built up by means of a bistable element and two diodes in each crossing point.
Inventors
- 👤 Harald Hoel
- 👤 Bertil Noro
- 👤 Rolf Eriksson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:11
CPC Classifications
H; H04; H04Q; H04Q3/00; H04Q3/0008; H04Q3/0012
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
41 words
Arrangement according to claim 1, said current sensing means comprising two transistor amplifiers each of said amplifiers including a transistor of the opposite type each base of which is connected through a diode to said second terminal of all bistable elements.
References Cited (Backward Citations)
US2895106A
Cited
US3168697A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-07-19 | 1975-01-18 | 1975-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-19 | 1979-01-18 | 1979-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-19 | 1983-01-18 | 1983-07-20 | $7700.00 | Window Closed / Lapsed |