US3333188A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Circuit for indicating predetermined voltage conditions on terminals
Assignee: AT&T Inc
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Filing: 1964-02-17
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Granted: 1967-07-25
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Expires: 1984-02-17
Abstract
No abstract record available.
Inventors
- 👤 Harold E Eagle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:14
CPC Classifications
G; G01; G01R; G01R31/00; G01R31/12; G01R31/14; G01R31/50; G01R31/54
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
193 words
A CIRCUIT FOR TESTING A VOLTAGE ON A TERMINAL BETWEEN FIRST AND SECOND PREDETERMINED VOLTAGES COMPRISING: A SERIES CIRCUIT WHICH INCLUDES A CURRENT RESPONSIVE DEVICE AND AN EMITTER AND A COLLECTOR OF A FIRST TRANSISTOR; A SECOND TRANSISTOR HAVING AN EMITER AND A COLLECTOR CONNECTED IN PARALLEL WITH THE CURRENT RESPONSIVE DEVICE AND THE FIRST TRANSISTOR; MEANS FOR CONNECTING THE SERIES CIRCUIT ACROSS A VOLTAGE SOURCE; A FIRST DIODE WHICH IS CONDUCTIVE FOR VOLTAGES ABOVE THE FIRST PREDETERMINED VOLTAGE AND IS NON-CONDUCTIVE FOR VOLTAGES BELOW THE FIRST PREDETERMINED VOLTAGE; MEANS FOR CONNECTING THE FIRST DIODE BETWEEN THE TERMINAL AND THE BASE OF THE FIRST TRANSISTOR SO THAT THE FIRST TRANSISTOR IS RENDERED CONDUCTIVE WHEN THE VOLTAGE ON THE TERMINAL EXCEEDS THE FIRST PREDETERMINED VOLTAGE; A SECOND DIODE WHICH IS CONDUCTIVE FOR VOLTAGES ABOVE THE SECOND PREDETERMINED VOLTAGE AND IS NON-CONDUCTIVE FOR VOLTAGES BELOW THE SECOND PREDETERMINED VOLTAGE; AND MEANS FOR CONNECTING THE SECOND DIODE BETWEEN THE TERMINAL AND THE BASE OF THE SECOND TRANSISTOR SO THAT THE SECOND TRANSISTOR IS RENDERED CONDUCTIVE TO SHUNT THE FIRST TRANSISTOR AND THE CURRENT RESPONSIVE DEVICE WHEN THE VOLTAGE ON THE TERMINAL EXCEEDS THE SECOND PREDETERMINED VOLTAGE.
References Cited (Backward Citations)
US2902642A
Cited
US3217310A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-07-24 | 1971-01-23 | 1971-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-07-24 | 1975-01-23 | 1975-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-07-24 | 1979-01-23 | 1979-07-25 | $7700.00 | Window Closed / Lapsed |