Patent US3520128A successfully refreshed from Google Patents.
Patent US3155877A successfully refreshed from Google Patents.
US3155877A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Safety circuits for electric motors
Assignee: YORK-LUXAIRE Inc A CORP OF DE
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Filing: 1960-11-01
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Granted: 1964-11-03
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Expires: 1980-11-01
Abstract
No abstract record available.
Inventors
- 👤 Erik H Jensen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:02
CPC Classifications
H; H02; H02H; H02H7/00; H02H7/08; H02H7/085; H02H7/0852; H02K; H02K11/00; H02K11/20; H02K11/25
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
99 words
A PROTECTIVE CIRCUIT FOR AN ELECTRIC MOTOR HAVING STATOR WINDINGS, COMPRISING A THERMISTOR EMBEDDED IN SAID WINDINGS, SAID THERMISTOR HAVING AT ITS ENDS SHORTCIRCUITED LOOPS IN WHICH CURRENT FLOWING THROUGH SAID WINDINGS INDUCES CURRENTS WHICH HEAT SAID LOOPS AND THROUGH SAID LOOPS HEAT SAID THERMISTOR, AN OVERLOAD RELAY HAVING AN ENERGIZING WINDING AND A NORMALLY CLOSED SWITCH, AN ENERGIZING CIRCUIT FOR SAID MOTOR INCLUDING SAID SWITCH, MEANS INCLUDING SAID THERMISTOR FOR FLOWING CURRENT IN ONE DIRECTION THROUGH SAID RELAY WINDING, AND MEANS RESPONSIVE TO CURRENT DRAWN BY SAID MOTOR FOR FLOWING CURRENT IN THE OPPOSITE DIRECTION THROUGH SAID WINDING.
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) | 1967-11-03 | 1968-05-04 | 1968-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-11-03 | 1972-05-04 | 1972-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-11-03 | 1976-05-04 | 1976-11-03 | $7700.00 | Window Closed / Lapsed |