US3119951A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Overcurrent protection unit for alternating current machines
Assignee: Lucas Support Services Ltd
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Filing: 1961-05-18
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Granted: 1964-01-28
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Expires: 1981-05-18
Abstract
No abstract record available.
Inventors
- 👤 Davy Kenneth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:40
CPC Classifications
H; H02; H02H; H02H1/00; H02H1/04; H02H1/043; H02H5/00; H02H5/04; H02H5/042
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
155 words
A PROTECTION CIRCUIT FOR USE WITH A MULTI-PHASE A.C. SYSTEM HAVING AN A.C. SOURCE, AN A.C. MACHINE AND A PLURALITY OF PHASE LINES CONNECTING THE A.C. SOURCE TO THE A.C. MACHINE, SAID PROTECTION CIRCUIT COMPRISING A PLURALITY OF TOROIDAL WINDINGS SURROUNDING THE PHASE LINES OF THE SYSTEM ADJACENT THE A.C. SOURCE, A PLURALITY OF RESISTORS CONNECTED ACROSS THE WINDINGS RESPECTIVELY SAID RESISTORS BEING HOUSED WITHIN A CASING OF SAID A.C. MACHINE, A CAPACITOR HAVING ONE SIDE THEREOF CONNECTED TO ONE END OF EACH RESISTOR, A PLURALITY OF DIODES THROUGH WHICH THE OTHER SIDE OF THE CAPACITOR IS CONNECTED TO THE OTHER ENDS OF THE PLURALITY OF RESISTORS, A DELAY CIRCUIT CONNECTED ACROSS THE CAPACITOR, AN OPERATING CIRCUIT CONNECTED ACROSS THE DELAY CIRCUIT AND INCLUDING A DEVICE WHICH BREAKS DOWN WHEN THE VOLTAGE ACROSS IT EXCEEDS A PREDETERMINED VALUE AND THEREAFTER CONTINUES TO CONDUCT UNTIL THE CURRENT FLOWING THROUGH IT FALLS PRACTICALLY TO ZERO, AND MEANS
Claim 2
Dependent Claim
155 words
A PROTECTION CIRCUIT FOR USE WITH A MULTI-PHASE A.C. SYSTEM HAVING AN A.C. SOURCE, AN A.C. MACHINE AND A PLURALITY OF PHASE LINES CONNECTING THE A.C. SOURCE TO THE A.C. MACHINE, SAID PROTECTION CIRCUIT COMPRISING A PLURALITY OF TOROIDAL WINDINGS SURROUNDING THE PHASE LINES OF THE SYSTEM ADJACENT THE A.C. SOURCE, A PLURALITY OF RESISTORS CONNECTED ACROSS THE WINDINGS RESPECTIVELY SAID RESISTORS BEING HOUSED WITHIN A CASING OF SAID A.C. MACHINE, A CAPACITOR HAVING ONE SIDE THEREOF CONNECTED TO ONE END OF EACH RESISTOR, A PLURALITY OF DIODES THROUGH WHICH THE OTHER SIDE OF THE CAPACITOR IS CONNECTED TO THE OTHER ENDS OF THE PLURALITY OF RESISTORS, A DELAY CIRCUIT CONNECTED ACROSS THE CAPACITOR, AN OPERATING CIRCUIT CONNECTED ACROSS THE DELAY CIRCUIT AND INCLUDING A DEVICE WHICH BREAKS DOWN WHEN THE VOLTAGE ACROSS IT EXCEEDS A PREDETERMINED VALUE AND THEREAFTER CONTINUES TO CONDUCT UNTIL THE CURRENT FLOWING THROUGH IT FALLS PRACTICALLY TO ZERO, AND MEANS
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) | 1967-01-27 | 1967-07-29 | 1968-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-01-27 | 1971-07-29 | 1972-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-01-27 | 1975-07-29 | 1976-01-28 | $7700.00 | Window Closed / Lapsed |