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US4522771A
Expired / Lapsed
US
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Method of fabricating layer insulation for use in high-voltage electrical equipment
Assignee: General Electric Co
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Filing: 1983-07-05
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Granted: 1985-06-11
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Expires: 2003-07-05
Abstract
Abstract A method of fabricating a layer insulation for use in high voltage electrical equipment by applying a mixture of inorganic particles, inorganic cement, and a fluid carrier vehicle for the cement to an intermingled array of inorganic fibers.
Inventors
- 👤 Joseph R. McLoughlin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 19:05
CPC Classifications
H; H01; H01F; H01F27/00; H01F27/28; H01F27/32; H01F27/323; H01B; H01B3/00; H01B3/02; H01B3/08; H01B3/084
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
85 words
The method of fabricating layer insulation for use in high-voltage electrical equipment, consisting essentially of: (a) applying a mixture of inorganic particles, inorganic cement, and a fluid carrier vehicle for said cement to an intermingled array of inorganic fibers; (b) pressing the product of (a) into a single layer having a generally planar configuration, said inorganic fibers reinforcing said layer to bond said inorganic particles together and the said inorganic fibers with said inorganic cement; and (c) removing said fluid carrier vehicle from said layer.
Claim 2
Independent Claim
85 words
The method of fabricating layer insulation for use in high-voltage electrical equipment, consisting essentially of: (a) applying a mixture of inorganic particles, inorganic cement, and a fluid carrier vehicle for said cement to an intermingled array of inorganic fibers; (b) pressing the product of (a) into a single layer having a generally planar configuration, said inorganic fibers reinforcing said layer to bond said inorganic particles together and the said inorganic fibers with said inorganic cement; and (c) removing said fluid carrier vehicle from said layer.
Claim 3
Dependent Claim
21 words
The method of claim 1 wherein said layer has a thickness in the range of approximately 1 mil to 10 mils.
Claim 4
Dependent Claim
24 words
The method of claim 1 wherein the thickness of said intermingled array of fibers is substantially the same as the thickness of said layer.
Claim 5
Dependent Claim
22 words
The method of claim 1 wherein said inorganic fibers comprise a material selected from the group consisting of glass, alumina, and quartz.
Claim 6
Dependent Claim
11 words
The method of claim 1 wherein said inorganic fibers comprise glass.
Claim 7
Dependent Claim
29 words
The method of claim 1 wherein said inorganic particles comprise a material selected from the group consisting of gypsum, silica, calcium carbonate, mica, clay, titanium dioxide, and magnesium dioxide.
Claim 8
Dependent Claim
12 words
The method of claim 1 wherein said fluid carrier vehicle comprises water.
Claim 9
Dependent Claim
24 words
The method of claim 1 wherein said inorganic cement comprises a material selected from the group consisting of silicate, phosphate, gypsum, and alumino silicate.
Claim 10
Dependent Claim
35 words
The method of claim 1 wherein said mixture of inorganic particles, said inorganic cement, and said fluid carrier vehicle for said cement are mixed into a paste form before being applied to said inorganic fibers.
Claim 11
Dependent Claim
31 words
The method of claim 1 further consisting essentially of placing said layer into the final position thereof in electrical equipment prior to the completion of removing said vehicle from said layer.
Claim 12
Dependent Claim
36 words
The method of claim 10 further consisting essentially of substantially retarding evaporation of said fluid carrier vehicle from the product of (a) until said layer is placed into the final position thereof in the electrical equipment.
Claim 13
Dependent Claim
27 words
The method of claim 11 wherein said substantially retarding evaporation of said fluid carrier vehicle from the product of (a) comprises mixing a plasticizer with said vehicle.
Claim 14
Dependent Claim
33 words
The method of claim 12 wherein said plasticizer comprises a material selected from the group consisting of ethylene glycol, glycerine, 2, 2' dihydroxy dipropyl ether, acetic acid, 2-ethoxy ethyl ester, and diethylene glycol.
Claim 15
Dependent Claim
23 words
The method of claim 1 further consisting essentially of impregnating said layer with oil after removing said fluid carrier vehicle from said layer.
Claim 16
Dependent Claim
28 words
The method of claim 14 wherein said oil comprises an oil with a substantially higher resistance to degradation at temperatures above about 165° centigrate relative to mineral oil.
Claim 17
Dependent Claim
23 words
The method of claim 1 wherein said removal of said fluid carrier vehicle from said layer is accomplished through the application of heat.
Claim 18
Dependent Claim
25 words
The method of claim 1 wherein said removal of said fluid carrier vehicle from said layer is accomplished through the application of heat and vacuum.
References Cited (Backward Citations)
US3711807A
Cited
US4278720A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-06-10 | 1988-12-10 | 1989-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-06-10 | 1992-12-10 | 1993-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-06-10 | 1996-12-10 | 1997-06-11 | $7700.00 | Window Closed / Lapsed |