Patent US3172030A successfully refreshed from Google Patents.
US3172030A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tap changing device with a stepless variable corrector winding
Assignee: McGraw Edison Co
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Filing: 1960-07-28
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Granted: 1965-03-02
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Expires: 1980-07-28
Abstract
No abstract record available.
Inventors
- 👤 Otis T Farry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 05:00
CPC Classifications
H; H01; H01F; H01F29/00; H01F29/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
111 words
A VOLTAGE REGULATOR FOR A TRANSFORMER HAVING A PRIMARY WINDING, A SECONDARY WINDING, AND A CORRECTOR WINDING ASSOCIATED WITH ONE OF THE OTHER TRANSFORMER WINDINGS, SAID REGULATOR COMPRISING THREE SWITCHES EACH HAVING A PLURALITY OF STATIONARY TERMINALS AND A MOVABLE SWITCH BLADE SELECTIVELY ENGAGEABLE WITH THE ASSOCIATED STATIONARY TERMINALS, MEANS CONNECTING SAID STATIONARY TERMINALS ON SAID SWITCHES TO DIFFERENT SELECTED POSITIONS ON THE CORRECTOR WINDING, AND A VARIABLE IMPEDANCE DEVICE CONNECTED BETWEEN EACH OF SAID MOVABLE SWITCH BLADES AND THE TRANSFORMER WINDING ASSOCIATED WITH THE CORRECTOR WINDING, EACH OF SAID IMPEDANCE DEVICES INCLUDING AN ALTERNATING CURRENT WINDING, A DIRECT CURRENT WINDING, AND AN ADJUSTABLE SOURCE OF DIRECT CURRENT FOR VARYING THE
Claim 2
Dependent Claim
111 words
A VOLTAGE REGULATOR FOR A TRANSFORMER HAVING A PRIMARY WINDING, A SECONDARY WINDING, AND A CORRECTOR WINDING ASSOCIATED WITH ONE OF THE OTHER TRANSFORMER WINDINGS, SAID REGULATOR COMPRISING THREE SWITCHES EACH HAVING A PLURALITY OF STATIONARY TERMINALS AND A MOVABLE SWITCH BLADE SELECTIVELY ENGAGEABLE WITH THE ASSOCIATED STATIONARY TERMINALS, MEANS CONNECTING SAID STATIONARY TERMINALS ON SAID SWITCHES TO DIFFERENT SELECTED POSITIONS ON THE CORRECTOR WINDING, AND A VARIABLE IMPEDANCE DEVICE CONNECTED BETWEEN EACH OF SAID MOVABLE SWITCH BLADES AND THE TRANSFORMER WINDING ASSOCIATED WITH THE CORRECTOR WINDING, EACH OF SAID IMPEDANCE DEVICES INCLUDING AN ALTERNATING CURRENT WINDING, A DIRECT CURRENT WINDING, AND AN ADJUSTABLE SOURCE OF DIRECT CURRENT FOR VARYING THE
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) | 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 |