US3891955A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical inductive apparatus
Assignee: ABB Inc USA
•
Filing: 1974-05-07
•
Granted: 1975-06-24
•
Expires: 1994-05-07
Abstract
Abstract Core and coil assembly for distribution transformers. At least a portion of the coil is constructed of a plurality of metallic foil conductors which are bonded to a common piece of insulating material. The foil conductors are disposed in the coil to form coil sections which are axially displaced from each other. The insulating material extends between the coil sections to prevent relative movement of adjacent coil sections. Each foil conductor is first bonded to the insulating material and then spirally wrapped to provide the coil structure. In one embodiment, an insulating collar is positioned between adjacent foil conductors for extra mechanical strength.
Inventors
- 👤 Iii William E Horton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 08:42
CPC Classifications
H; H01; H01F; H01F27/00; H01F27/28; H01F27/32; H01F27/323; H01F27/30; H01F27/306
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
80 words
A transformer comprising: a magnetic core; a primary winding disposed in inductive relationship with said magnetic core; a secondary winding having a plurality of conducting layers disposed in inductive relationship with the magnetic core, with each of said conducting layers comprising at least two metallic foil conductors which are bonded to a common layer of insulating material; and, an insulating member positioned between the foil conductors, with said insulating member having substantially the same radial thickness as the foil conductors.
Claim 2
Dependent Claim
80 words
A transformer comprising: a magnetic core; a primary winding disposed in inductive relationship with said magnetic core; a secondary winding having a plurality of conducting layers disposed in inductive relationship with the magnetic core, with each of said conducting layers comprising at least two metallic foil conductors which are bonded to a common layer of insulating material; and, an insulating member positioned between the foil conductors, with said insulating member having substantially the same radial thickness as the foil conductors.
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) | 1978-06-23 | 1978-12-23 | 1979-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-23 | 1982-12-23 | 1983-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-23 | 1986-12-23 | 1987-06-24 | $7700.00 | Window Closed / Lapsed |