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Patent US3716718A successfully refreshed from Google Patents.
US3716718A
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US
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Loss of phase detector for a polyphase power system
Assignee: Bull HN Information Systems Italia SpA
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Filing: 1972-04-03
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Granted: 1973-02-13
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Expires: 1992-04-03
Abstract
Abstract THE IMPROVED LOSS OF PHASE DETECTOR EMPLOYS A PLURALITY OF DIODES CONNECTED BETWEEN A TRANSISTOR AND A POLYPHASE A.C. POWER SYSTEM. A SIGNAL TRANSISTOR AND A SILICON UNILATERAL SWITCH PROVIDE AN ALARM SIGNAL WHEN POWER IS LOST IN ANY ONE OF THE PHASES OF THE POLYPHASE SYSTEM. FEW COMPONENTS ARE USED SOT AHT COST OF THE DETECTOR IS RELATIVELY LOW.
Inventors
- 👤 J Nowell
- 👤 L Genuit
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:29
CPC Classifications
H; H02; H02H; H02H3/00; H02H3/24; H02H3/253
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) | 1976-02-13 | 1976-08-14 | 1977-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-13 | 1980-08-14 | 1981-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-13 | 1984-08-14 | 1985-02-13 | $7700.00 | Window Closed / Lapsed |