US4893400A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making a repairable transformer having amorphous metal core
Assignee: ABB Inc USA
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Filing: 1987-08-21
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Granted: 1990-01-16
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Expires: 2007-08-21
Abstract
Abstract A method of making a repairable transformer having an amorphous metal core 1 wherein three uncut legs of an annealed wound amorphous metal core are covered with an adhesive impregnated material 10 while leaving the cut leg, 6 and 7, and both adjoining radii uncovered. The adhesive is cured, causing the adhesive to bond to the core. The core joint is opened and coils 11 and 12 are placed over the legs that adjoin the cut leg. The core joint is closed and the edges of the joint and both adjoining radii are covered with a porous material. No adhesive bonds to the edges of the cut leg or to the edges of adjoining radii. The resulting transformer can be repaired by cutting away the porous material that covers the cut leg and the adjoining radii, opening the core joint, replacing a defective coil, reclosing the core joint, and resealing the cut leg as before.
Inventors
- 👤 Terrence E. Chenoweth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:30
CPC Classifications
H; H01; H01F; H01F41/00; H01F41/02; H01F41/0206; H01F41/0213; H01F41/0226; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49073; Y10T29/49075; Y10T29/49078
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
94 words
In a method of making a transformer having a wound amorphous metal core with a core joint in a cut leg, an improvement that makes said transformer repairable, characterized by completely enclosing said core in materials that prevents the escape of particles of said amorphous metal, where some of said materials, are impregnated with a curable adhesive, and curing said adhesive to bond materials impregnated therewith to said core, while preventing said adhesive from bonding to the edges of said cut leg and to the edges of the radii that adjoin said cut leg.
Claim 2
Dependent Claim
94 words
In a method of making a transformer having a wound amorphous metal core with a core joint in a cut leg, an improvement that makes said transformer repairable, characterized by completely enclosing said core in materials that prevents the escape of particles of said amorphous metal, where some of said materials, are impregnated with a curable adhesive, and curing said adhesive to bond materials impregnated therewith to said core, while preventing said adhesive from bonding to the edges of said cut leg and to the edges of the radii that adjoin said cut leg.
Claim 3
Independent Claim
125 words
A method of making a repairable transformer having an annealed wound amorphous metal core with a core joint in a cut leg comprising: (A) covering uncut legs of said core with a substrate impregnated with a curable adhesive, while leaving said cut leg and both adjoining radii uncovered; (B) curing said adhesive, whereby said adhesive bonds to said core; (C) opening said core joint; (D) placing at least one coil over at least one leg that adjoins said cut leg; (E) closing said core joint; and (F) covering the edges of said cut leg and both adjoining radii with a porous substrate without bonding said porous substrate to the edges of said cut leg or to the edges of radii that adjoin said cut leg.
Claim 4
Independent Claim
125 words
A method of making a repairable transformer having an annealed wound amorphous metal core with a core joint in a cut leg comprising: (A) covering uncut legs of said core with a substrate impregnated with a curable adhesive, while leaving said cut leg and both adjoining radii uncovered; (B) curing said adhesive, whereby said adhesive bonds to said core; (C) opening said core joint; (D) placing at least one coil over at least one leg that adjoins said cut leg; (E) closing said core joint; and (F) covering the edges of said cut leg and both adjoining radii with a porous substrate without bonding said porous substrate to the edges of said cut leg or to the edges of radii that adjoin said cut leg.
Claim 5
Dependent Claim
12 words
A method according to claim 2 wherein said adhesive is UV curable.
Claim 6
Dependent Claim
12 words
A method according to claim 3 wherein said substrate is UV transparent.
Claim 7
Dependent Claim
12 words
A method according to claim 4 wherein said substrate is woven glass.
Claim 8
Dependent Claim
13 words
A method according to claim 2 wherein said porous substrate is cotton cloth.
Claim 9
Dependent Claim
21 words
A method according to claim 2 wherein said core is on a steel mandrel and is enclosed in a steel jacket.
Claim 10
Dependent Claim
29 words
A method according to claim 2 wherein said core is rectangular, h as a rectangular cross-section and a coil is placed over each leg that adjoins said cut leg.
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) | 1993-01-15 | 1993-07-17 | 1994-01-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-01-15 | 1997-07-17 | 1998-01-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-01-15 | 2001-07-17 | 2002-01-16 | $7700.00 | Window Closed / Lapsed |