US3626083A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High-voltage insulation and insulated high-voltage apparatus
Assignee: Westinghouse Electric Corp
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Filing: 1968-01-12
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Granted: 1971-12-07
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Expires: 1988-01-12
Abstract
Abstract An admixture of (1) from 55 to 70 percent by weight of hydrated alumina and (2) from 30 to 45 percent by weight of a petroleum oil extended ethylene-propylene-diene terpolymer, containing from 20 to 100 phr. of oil, is molded about electrical apparatus to provide insulation for components thereof. The hydrated alumina is advantageously finely divided so that a major portion or substantially all particles are less than 2 microns. The terpolymer is derived from the reaction of an admixture of (I) from about 85 to 99 molar percent of a mixture of (a) about 3o to 70 molar percent of ethylene and (b) about 30 to 70 molar percent of propylene and (II) from about 1 to 15 molar percent of a diene having isolated or nonconjugated double bonds, at least one of the double bonds of the diene being terminally located.
Inventors
- 👤 Herbert F Minter
- 👤 Richard D Buckley
- 👤 Martin P Seidel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:50
CPC Classifications
H; H01; H01F; H01F27/00; H01F27/02; H01F27/022; Y; Y10; Y10S; Y10S174/00; Y10S174/01
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
21 words
The apparatus of claim 1 wherein a major portion of said hydrated alumina has a particle size less than 2 microns.
Claim 2
Dependent Claim
39 words
The apparatus of claim 1 wherein the particulated hydrated alumina has substantially all of its particles of a particle size less than 2 microns and (B) the petroleum oil content is from 50 to 65 phr. of ethylene-propylene-diene terpolymer.
Claim 3
Dependent Claim
31 words
The apparatus of claim 1 wherein said spaced electrically conductive members are elements of a transformer and the insulating material is molded to support and largely surround the electrically conductive members.
Claim 4
Dependent Claim
126 words
A cured organic base electrical insulating composition suitable for prolonged exposure to arcing, tracking and high-voltage stresses under corona conditions consisting essentially of an intimate admixture of (A) from about 55 to 70 percent of a particulated hydrated alumina and (B) from about 30 to 45 percent, by weight, of a petroleum oil extended ethylene-propylene terpolymer consisting essentially of (1) from about 85 to 99 molar percent of a mixture of (a) about 30 to 70 molar percent of ethylene and (b) about 30 to 70 percent of propylene and (2) from about 1 to 15 molar percent of a diene having isolated double bonds, at least one of the double bonds being terminally located, and containing from 20 to 100 phr. of the petroleum oil.
Claim 5
Dependent Claim
21 words
The composition of claim 5 wherein a major portion of the hydrated alumina has a particle size less than 2 microns.
Claim 6
Dependent Claim
21 words
The composition of claim 5 wherein the particle size of substantially all of the hydrated alumina is less than 2 microns.
Claim 7
Dependent Claim
18 words
The composition of claim 5 wherein the petroleum oil is within the range of 50 to 65 phr.
Claim 8
Dependent Claim
142 words
In electrical apparatus having spaced electrically conductive members between which an electrical potential is developed, a cured organic base-insulating material having improved voltage endurance properties disposed between said members, the improvement comprising the insulating material consisting essentially of a vulcanized mixture of (A) from about 55 to 70 percent, by weight, of particulated hydrated alumina and (B) from about 30 to 45 percent, by weight, of a petroleum oil extended ethylene-propylene-diene terpolymer consisting essentially of (1) from about 85 to 99 molar percent of a mixture of (a) about 30 to 70 molar percent of ethylene and (b) about 30 to 70 percent of propylene and (2) from about 1 to 15 molar percent of a diene having isolated double bonds, at least one of the double bonds being terminally located, and containing from 20 to 100 phr. of the petroleum oil.
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) | 1974-12-06 | 1975-06-07 | 1975-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-06 | 1979-06-07 | 1979-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-06 | 1983-06-07 | 1983-12-07 | $7700.00 | Window Closed / Lapsed |