Patent US3845437A successfully refreshed from Google Patents.
US3845437A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Series-multiple transformer having non-integer series-parallel voltage ratio
Assignee: Allis Chalmers Corp
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Filing: 1973-05-17
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Granted: 1974-10-29
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Expires: 1993-05-17
Abstract
Abstract A dual-voltage series-multiple transformer having a non-integer series-parallel voltage ratio has a plurality of untapped seriesmultiple primary winding sections of equal voltage rating that may be alternately connected in series or parallel and a common untapped primary winding section which is in series with the series-multiple primary winding sections in both the series and the parallel connection, thereby eliminating floating and open end windings.
Inventors
- 👤 E Goodman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 12:20
CPC Classifications
H; H01; H01F; H01F29/00
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
105 words
A dual-voltage multi-winding transformer having a secondary winding and a primary winding comprising a plurality of untapped series-multiple primary winding sections of equal voltage rating and an untapped common primary winding section, and means for alternately connecting said series-multiple primary winding sections in series or parallel, said common primary winding section being in series with said series-multiple winding sections in both the series and the parallel connection thereof, the higher primary voltage rating of said transformer when said series-multiple primary winding sections are connected in series being a non-integer multiple of the lower primary voltage rating when said series-multiple winding sections are connected in parallel.
Claim 2
Dependent Claim
105 words
A dual-voltage multi-winding transformer having a secondary winding and a primary winding comprising a plurality of untapped series-multiple primary winding sections of equal voltage rating and an untapped common primary winding section, and means for alternately connecting said series-multiple primary winding sections in series or parallel, said common primary winding section being in series with said series-multiple winding sections in both the series and the parallel connection thereof, the higher primary voltage rating of said transformer when said series-multiple primary winding sections are connected in series being a non-integer multiple of the lower primary voltage rating when said series-multiple winding sections are connected in parallel.
Claim 3
Dependent Claim
26 words
A dual-voltage transformer in accordance with claim 1 wherein said common winding section has a voltage rating different than that of said series-multiple primary winding sections.
Claim 4
Dependent Claim
119 words
A multi-winding series-multiple transformer having a non-integer series-parallel voltage ratio and a higher primary voltage rating of a + nb and a lower primary voltage rating of a + b comprising n untapped series-multiple primary winding sections each having a voltage rating of b and an untapped common primary winding section having a voltage rating of a which is different from b, where n is an integer, means for alternatively connecting said n series-multiple winding sections in series or in parallel, said common primary winding section being in electrical series relation with said series-multiple primary winding sections in both the series and the parallel connection thereof, and a secondary winding inductively linked with each of said primary winding sections.
Claim 5
Dependent Claim
119 words
A multi-winding series-multiple transformer having a non-integer series-parallel voltage ratio and a higher primary voltage rating of a + nb and a lower primary voltage rating of a + b comprising n untapped series-multiple primary winding sections each having a voltage rating of b and an untapped common primary winding section having a voltage rating of a which is different from b, where n is an integer, means for alternatively connecting said n series-multiple winding sections in series or in parallel, said common primary winding section being in electrical series relation with said series-multiple primary winding sections in both the series and the parallel connection thereof, and a secondary winding inductively linked with each of said primary winding sections.
Claim 6
Dependent Claim
38 words
A dual-voltage transformer in accordance with claim 1 wherein said higher primary voltage rating when said series-multiplier primary winding sections are connected in series is also a non-integer multiple of the voltage rating of said common winding section.
Claim 7
Dependent Claim
29 words
A dual-voltage tranformer in accordance with claim 2 wherein the ampere turns of said common winding section subtract electrically from the ampere turns of said series-multiple primary winding sections.
Claim 8
Dependent Claim
24 words
A dual-voltage tranformer in accordance with claim 1 wherein the only primary winding section provided with graded line-end insulation is said common winding section.
Claim 9
Dependent Claim
40 words
A dual-voltage transformer in accordance with claim 1 wherein said common primary winding section is wound in a cylindrical layer and said series-multiple primary winding sections are wound in respective cylindrical layers concentric with said common primary winding section layer.
References Cited (Backward Citations)
US3706060A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-10-28 | 1978-04-29 | 1978-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-28 | 1982-04-29 | 1982-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-28 | 1986-04-29 | 1986-10-29 | $7700.00 | Window Closed / Lapsed |