Patent US3836829A successfully refreshed from Google Patents.
US3836829A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyolefin film containing therein widely dispersed fine particles of a dielectric liquid soluble material
Assignee: General Electric Co
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Filing: 1969-12-29
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Granted: 1974-09-17
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Expires: 1989-12-29
Abstract
Abstract Polyolefin resin has combined therewith, in a widely dispersed manner, discrete fine particles of a material which is readily soluble in a capacitor dielectric liquid impregnant. A capacitor grade dielectric film made from this resin includes the noted particles dispersed therein, so that when the film is impregnated, in a capacitor modification, the fine particles dissolve to pass the dielectric liquid impregnant throughout the film.
Inventors
- 👤 J Eustance
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:20
CPC Classifications
H; H01; H01G; H01G4/00; H01G4/002; H01G4/018; H01G4/20; H01G4/22; C; C08; C08L; C08L23/00; C08L23/02; H01B; H01B3/00; H01B3/002; H01B3/006; H01B3/18; H01B3/30; H01B3/44; H01B3/441; Y; Y10; Y10T; Y10T428/00; Y10T428/249921; Y10T428/26; Y10T428/268
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
30 words
The invention as recited in claim 1 wherein said resin film is polypropylene and said filler material is selected from the group consisting essentially of polycarbonates, polysulfones, and polyphenylene oxides.
Claim 2
Dependent Claim
15 words
The invention as recited in claim 2 wherein said particles are rod like in shape.
Claim 3
Dependent Claim
33 words
The invention as recited in claim 3 wherein said rods are of random lengths ranging from lengths less than the thickness of said film to lengths greater than the thickness of said film.
Claim 4
Dependent Claim
24 words
The invention as recited in claim 2 wherein said polymer particles occupy from about 0.5 to about 30 percent by volume of said film.
Claim 5
Dependent Claim
39 words
The invention as recited in claim 5 wherein said polymer particles are of an average diameter which is less than about one-half the thickness of said film and the maximum diameter is less than the thickness of said film.
Claim 6
Dependent Claim
92 words
In an electrical capacitor utilizing polypropylene film as a dielectric, and subject to impregnation with a liquid hydrocarbon impregnant, the improvement of a. the said polypropylene having widely dispersed therein between 0.5 and 30 percent by volume of a further polymer in discrete fine particle form b. the average diameter of said particles being less than the thickness of said film c. the fine particles being readily soluble in said liquid hydrocarbon during impregnation of said capacitor d. the said particles having a softening temperature greater than that of said polypropylene film.
Claim 7
Dependent Claim
59 words
A method of impregnating the capacitor of claim 7 comprising a. assembling a capacitor roll section utilizing said improved polypropylene film b. inserting said roll section in a casing c. filling said casing with a liquid hydrocarbon d. and subjecting said capacitor to an elevated temperature sufficient for said liquid hydrocarbon to permeate said film and dissolve said particles.
Claim 8
Dependent Claim
15 words
The invention as recited in claim 8 wherein said liquid hydrocarbon is a chlorinated diphenyl.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-09-16 | 1978-03-18 | 1978-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-16 | 1982-03-18 | 1982-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-16 | 1986-03-18 | 1986-09-17 | $7700.00 | Window Closed / Lapsed |