US3648339A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making impregnated capacitor
Assignee: Siemens AG
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Filing: 1970-05-01
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Granted: 1972-03-14
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Expires: 1990-05-01
Abstract
Abstract An impregnated capacitor which has a coiled body of alternate layers of plastic dielectric foils and charge-carrying elements characterized by the outer or convex surfaces of the chargecarrying elements being rougher than the inner or concave surface to facilitate the flow of an impregnating material through the coiled body. The process for making the capacitor includes heating the coiled body prior to impregnation to shrink the dielectric foil to increase the space between each of the concave surfaces and its adjacent dielectric layer and to decrease the spacing between each of the convex surfaces and its adjacent dielectric layer, then impregnating the coiled body to fill all the spaces or gaps between the layers.
Inventors
- 👤 Heinz Preissinger
- 👤 Reiner Simson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 04:20
CPC Classifications
H; H01; H01G; H01G4/00; H01G4/002; H01G4/018; H01G4/06; H01G4/14; H01G4/18; H01G13/00; H01G13/04; H01G4/20; H01G4/22; H01G4/32; Y; Y10; Y10T; Y10T29/00; Y10T29/43; Y10T29/435
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
213 words
A method of producing an impregnated electrical capacitor body comprising the steps of providing a pair of charge-carrying elements, each element being a paper band having a smooth surface and a rough surface with both surfaces being metallized to provide surface layers which are electrically interconnected; providing dielectric foils of plastic material, which material is shrinkable at an elevated temperature; winding the charge-carrying elements and the dielectric foils into a capacitor coil at a predetermined degree of coil tightness to form a coiled capacitor body with a dielectric layer separating adjacent wound layers of the charge-carrying elements, said winding being in a direction so that the rough surface of the charge-carrying element is the convex surface of each wound layer of the charge-carrying elements; heating the coiled capacitor body to cause shrinkage of the dielectric foil to increase the spacing between the smooth surface of the charge-carrying element and the surface of the adjacent dielectric foil and to decrease the spacing between the rough surface of the charge-carrying element and its adjacent dielectric foil; and subsequently impregnating the coiled capacitor body with an impregnating material to fill the spaces and gaps between the surfaces of the charge-carrying elements and the adjacent surfaces of the dielectric foils to remove any airgaps and voids therebetween.
Claim 2
Independent Claim
213 words
A method of producing an impregnated electrical capacitor body comprising the steps of providing a pair of charge-carrying elements, each element being a paper band having a smooth surface and a rough surface with both surfaces being metallized to provide surface layers which are electrically interconnected; providing dielectric foils of plastic material, which material is shrinkable at an elevated temperature; winding the charge-carrying elements and the dielectric foils into a capacitor coil at a predetermined degree of coil tightness to form a coiled capacitor body with a dielectric layer separating adjacent wound layers of the charge-carrying elements, said winding being in a direction so that the rough surface of the charge-carrying element is the convex surface of each wound layer of the charge-carrying elements; heating the coiled capacitor body to cause shrinkage of the dielectric foil to increase the spacing between the smooth surface of the charge-carrying element and the surface of the adjacent dielectric foil and to decrease the spacing between the rough surface of the charge-carrying element and its adjacent dielectric foil; and subsequently impregnating the coiled capacitor body with an impregnating material to fill the spaces and gaps between the surfaces of the charge-carrying elements and the adjacent surfaces of the dielectric foils to remove any airgaps and voids therebetween.
Claim 3
Dependent Claim
31 words
A method according to claim 1 wherein the dielectric material is a polypropylene plastic material and wherein the heating step is carried out at an elevated temperature of approximately 120* C.
Claim 4
Dependent Claim
52 words
A method according to claim 1 wherein the dielectric foil is a material which swells when contacted by the impregnating material and wherein said method includes the step of heattreating the impregnated coiled capacitor body to cause swelling of the dielectric foils into tight engagement with the surfaces of the charge-carrying elements.
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) | 1975-03-14 | 1975-09-13 | 1976-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-14 | 1979-09-13 | 1980-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-14 | 1983-09-13 | 1984-03-14 | $7700.00 | Window Closed / Lapsed |