US3172017A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Frequency-responsive relay system
Assignee: Automatic Switch Co
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Filing: 1961-06-19
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Granted: 1965-03-02
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Expires: 1981-06-19
Abstract
No abstract record available.
Inventors
- 👤 William A Moakler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:20
CPC Classifications
H; H01; H01H; H01H47/00; H01H47/02; H01H47/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
196 words
A FREQUENCY-RESPONSIVE RELAY SYSTEM COMPRISING: A PAIR OF INPUT TERMINALS FOR CONNECTION TO A SOURCE OF ALTERNATING CURRENT POWER WHICH MAY VARY IN FREQUENCY, A FIRST CIRCUIT CONNECTED IN SERIES BETWEEN THE INPUT TERMINALS AND A FIRST RECTIFIER, A SECOND CIRCUIT CONNECTED IN SERIES BETWEEN THE INPUT TERMINALS AND A SECOND RECTIFIER, A RELAY HAVING A NON-POLARIZED ARMATURE AND A CORE HAVING A SINGLE MAGNETIC FLUX PATH, MEANS YIELDABLY URGING THE ARMATURE TO A DROP-OUT POSITION, AND TWO WINDINGS ON SAID CORE ARRANGED TO PRODUCE MAGNETOMOTIVE FORCES IN OPPOSITION TO EACH OTHER, ONE OF SAID WINDINGS BEING CONNECTED TO RECEIVE THE OUTPUT OF ONE OF SAID RECTIFIERS AND THE OTHER WINDING BEING CONNECTED TO RECEIVE THE OUTPUTS OF THE OTHER RECTIFIER, SAID FIRST AND SECOND CIRCUITS BEING SO CONSTRUCTED THAT THEY PRODUCE DIFFERENTIAL PATTERNS OF FREQUENCY-RESPONSIVE CURRENT VARIATION, THE PATTERNS BEING SUCH THAT AT ALL FREQUENCIES ABOVE A PREDETERMINED VALUE THE CURRENT FLOWING IN ONE OF SAID CIRCUITS IS SUFFICIENTLY DIFFERENT IN MAGNITUDE FROM THE CURRENT FLOWING IN THE OTHER THAT THE ARMATURE IS MAGNETICALLY ATTRACTED OUT OF ITS DROP-OUT POSITION, AND AT ALL FREQUENCIES BELOW SAID VALUE THE CURRENT DIFFERENTIAL IS INSUFFICIENT TO DO SO.
Claim 2
Dependent Claim
196 words
A FREQUENCY-RESPONSIVE RELAY SYSTEM COMPRISING: A PAIR OF INPUT TERMINALS FOR CONNECTION TO A SOURCE OF ALTERNATING CURRENT POWER WHICH MAY VARY IN FREQUENCY, A FIRST CIRCUIT CONNECTED IN SERIES BETWEEN THE INPUT TERMINALS AND A FIRST RECTIFIER, A SECOND CIRCUIT CONNECTED IN SERIES BETWEEN THE INPUT TERMINALS AND A SECOND RECTIFIER, A RELAY HAVING A NON-POLARIZED ARMATURE AND A CORE HAVING A SINGLE MAGNETIC FLUX PATH, MEANS YIELDABLY URGING THE ARMATURE TO A DROP-OUT POSITION, AND TWO WINDINGS ON SAID CORE ARRANGED TO PRODUCE MAGNETOMOTIVE FORCES IN OPPOSITION TO EACH OTHER, ONE OF SAID WINDINGS BEING CONNECTED TO RECEIVE THE OUTPUT OF ONE OF SAID RECTIFIERS AND THE OTHER WINDING BEING CONNECTED TO RECEIVE THE OUTPUTS OF THE OTHER RECTIFIER, SAID FIRST AND SECOND CIRCUITS BEING SO CONSTRUCTED THAT THEY PRODUCE DIFFERENTIAL PATTERNS OF FREQUENCY-RESPONSIVE CURRENT VARIATION, THE PATTERNS BEING SUCH THAT AT ALL FREQUENCIES ABOVE A PREDETERMINED VALUE THE CURRENT FLOWING IN ONE OF SAID CIRCUITS IS SUFFICIENTLY DIFFERENT IN MAGNITUDE FROM THE CURRENT FLOWING IN THE OTHER THAT THE ARMATURE IS MAGNETICALLY ATTRACTED OUT OF ITS DROP-OUT POSITION, AND AT ALL FREQUENCIES BELOW SAID VALUE THE CURRENT DIFFERENTIAL IS INSUFFICIENT TO DO SO.
References Cited (Backward Citations)
DE662881C
Cited
US1959161A
Cited
CH233004A
Cited
GB623970A
Cited
US2721297A
Cited
US2960631A
Cited
US2998551A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-03-01 | 1968-08-31 | 1969-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-03-01 | 1972-08-31 | 1973-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-03-01 | 1976-08-31 | 1977-03-02 | $7700.00 | Window Closed / Lapsed |