Patent US3250929A successfully refreshed from Google Patents.
Patent US4551700A successfully refreshed from Google Patents.
US4551700A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Toroidal power transformer
Assignee: TOROID TRANSFORMATOR A SWEDEN CORP AB
•
Filing: 1984-03-14
•
Granted: 1985-11-05
•
Expires: 2004-03-14
Abstract
Abstract A toroidal power transformer having improved insulation between the primary and secondary windings. The insulation includes an insulator sleeve fitted to the primary winding and having the primary winding lead wires positioned therein such that the lead wires extend radially outward from the primary winding. This insulator sleeve is fitted to the primary windings by way of an insulator flange formed as an integral part of the insulator sleeve which insures good insulation between the primary and secondary windings and high creepage distance.
Inventors
- 👤 Anders Waldemar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:44
CPC Classifications
H; H01; H01F; H01F27/00; H01F27/28; H01F27/29; H01F17/00; H01F17/04; H01F17/06; H01F17/062
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
185 words
A toroidal power transformer having a primary and a secondary winding and comprising: a toroidal shaped core; a primary winding wound about said core, having primary lead wires, and having an annular end surface and a cylindrical side surface forming a shoulder therebetween; sleeve insulator means, having a tube portion and having a flange portion connected to the tube portion with no gaps therebetween and formed continuously about the tube portion such that the flange portion conformingly and continuously covers part of the annular end surface, part of the cylindrical side surface and part of the shoulder in the region around said primary lead wires, for housing said primary lead wires, for positioning said primary lead wires outward from said primary winding and for providing creepage distance between said primary winding and said secondary winding in said region around said primary lead wires; a wrapped insulator, overlappingly wrapped around said primary winding and said flange portion of said sleeve insulator means; and said secondary winding wound about said wrapped insulator and above said flange portion of said sleeve insulator means and having secondary lead wires.
Claim 2
Dependent Claim
185 words
A toroidal power transformer having a primary and a secondary winding and comprising: a toroidal shaped core; a primary winding wound about said core, having primary lead wires, and having an annular end surface and a cylindrical side surface forming a shoulder therebetween; sleeve insulator means, having a tube portion and having a flange portion connected to the tube portion with no gaps therebetween and formed continuously about the tube portion such that the flange portion conformingly and continuously covers part of the annular end surface, part of the cylindrical side surface and part of the shoulder in the region around said primary lead wires, for housing said primary lead wires, for positioning said primary lead wires outward from said primary winding and for providing creepage distance between said primary winding and said secondary winding in said region around said primary lead wires; a wrapped insulator, overlappingly wrapped around said primary winding and said flange portion of said sleeve insulator means; and said secondary winding wound about said wrapped insulator and above said flange portion of said sleeve insulator means and having secondary lead wires.
Claim 3
Dependent Claim
24 words
A toroidal power transformer according to claim 1, wherein said tubular portion and said flange portion are formed of a single piece of material.
Claim 4
Dependent Claim
18 words
A toroidal power transformer according to claim 1, wherein said creepage distance is a minimum of 3/8 inch.
Claim 5
Dependent Claim
18 words
A toroidal power transfomer according to claim 2, wherein said creepage distance is a minimum of 3/8 inch.
References Cited (Backward Citations)
DE713738C
Cited
US2243553A
Cited
US2425443A
Cited
US3192377A
Cited
US3676579A
Cited
DE2713117A1
Cited
US4384167A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-11-04 | 1989-05-06 | 1989-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-11-04 | 1993-05-06 | 1993-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-11-04 | 1997-05-06 | 1997-11-05 | $7700.00 | Window Closed / Lapsed |