US3706060A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Series-multiple transformer
Assignee: Allis Chalmers Corp
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Filing: 1971-05-14
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Granted: 1972-12-12
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Expires: 1991-05-14
Abstract
Abstract AN ELECTRICAL TRANSFORMER HAVING A PLURALITY OF UNTAPPED PRIMARY WINDING SECTIONS CONNECTABLE IN EITHER SERIES OR IN PARALLEL FOR ALTERNATIVELY EITHER A HIGHER PRIMARY VOLTAGE RATING OR A LOWER PRIMARY VOLTAGE RATING, A TAPPED PRIMARY WINDING SECTION CONNECTED IN SERIES WITH THE PLURALITY OF UNTAPPED WINDING SECTIONS IN BOTH THE SERIES AND IN THE PARALLEL CONNECTION THEREOF AND PERMITTING ADJUSTMENT BY A TAP CHANGER SWITCH OF THE EFFECTIVE NUMBER OF PRIMARY TURNS, WHEREBY TO ADJUST ALTERNATIVELY EITHER THE HIGHER PRIMARY VOLTAGE RATING OR THE LOWER PRIMARY VOLTAGE RATING OF THE TRANSFORMER.
Inventors
- 👤 Ernest A Goodman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 19:51
CPC Classifications
H; H01; H01F; H01F29/00; H01F29/02
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) | 1975-12-12 | 1976-06-12 | 1976-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-12 | 1980-06-12 | 1980-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-12 | 1984-06-12 | 1984-12-12 | $7700.00 | Window Closed / Lapsed |