Patent US2477845A successfully refreshed from Google Patents.
Patent US3909894A successfully refreshed from Google Patents.
US3909894A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of end-contacting electrical capacitors
Assignee: Siemens AG
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Filing: 1974-02-04
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Granted: 1975-10-07
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Expires: 1994-02-04
Abstract
Abstract A method of end-contacting electrical capacitors which includes the step of extracting a wax film from the end faces of the foils forming the capacitor winding. Extraction of the wax film takes place in a vessel supplied with a circulating solvent. Reels of capacitor foils are suspended within the solvent in such a manner as to allow wax extraction at the end faces of the reels.
Inventors
- 👤 Ulrich Muller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 22:39
CPC Classifications
H; H01; H01G; H01G13/00; H01G13/006; Y; Y10; Y10T; Y10T29/00; Y10T29/43; Y10T29/435
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
113 words
A method of end-contacting an electrical capacitor having electrodes, dielectric films and wax residues on the electrodes, dielectric films and wax residues on the electrodes wherein the electrodes of opposing polarities extend respectively to different ends of the capacitor each electrode having one of its edges adjacent the capacitor end to which it extends, said capacitor comprising a plurality of wound foils comprising the steps of winding the capacitor foils, putting the wound foils in an extraction vessel containing a wax solvent to extract wax from the edges of the electrodes and expose the same, removing the foil from the extraction vessel, and electrically contacting the exposed electrode edges of the finished capacitor.
Claim 2
Independent Claim
113 words
A method of end-contacting an electrical capacitor having electrodes, dielectric films and wax residues on the electrodes, dielectric films and wax residues on the electrodes wherein the electrodes of opposing polarities extend respectively to different ends of the capacitor each electrode having one of its edges adjacent the capacitor end to which it extends, said capacitor comprising a plurality of wound foils comprising the steps of winding the capacitor foils, putting the wound foils in an extraction vessel containing a wax solvent to extract wax from the edges of the electrodes and expose the same, removing the foil from the extraction vessel, and electrically contacting the exposed electrode edges of the finished capacitor.
Claim 3
Dependent Claim
28 words
A method in accordance with claim 1 wherein the capacitor is removed from the extraction vessel after the wax at the edges of the electrodes is extracted only.
Claim 4
Dependent Claim
14 words
A method in accordance with claim 2 wherein the wax solvent comprises light benzine.
Claim 5
Independent Claim
99 words
A method of end contacting a mutually laterally offset three-film foil electrical capacitor, said three-film foil being formed of two thin varnish films and an intermediate bonded metal film, said capacitor comprising a plurality of said foils, comprising the steps of: winding the capacitor foils, putting the wound foils in an extraction vessel containing an ester-alcohol mixture, retaining the foils in the mixture until the varnish films are dissolved in the laterally offset zone at the edges of the wound foils to expose said edges, removing the foils and electrically contacting the exposed electrode edges of the finished capacitor.
Claim 6
Independent Claim
99 words
A method of end contacting a mutually laterally offset three-film foil electrical capacitor, said three-film foil being formed of two thin varnish films and an intermediate bonded metal film, said capacitor comprising a plurality of said foils, comprising the steps of: winding the capacitor foils, putting the wound foils in an extraction vessel containing an ester-alcohol mixture, retaining the foils in the mixture until the varnish films are dissolved in the laterally offset zone at the edges of the wound foils to expose said edges, removing the foils and electrically contacting the exposed electrode edges of the finished capacitor.
Claim 7
Dependent Claim
19 words
A method in accordance with claim 4 wherein the ends of the capacitor are contacted by pressure fitting caps.
Claim 8
Dependent Claim
31 words
A method in accordance with claim 1 wherein the wax residues are extracted before the final capacitor is wound and wherein the extraction is confined to the edges of the foil.
Claim 9
Dependent Claim
71 words
A method as set forth in claim 6 wherein at least one supply reel of the width required in the final capacitor is introduced into a Soxhlet extractor apparatus; and in that between individual supply reels and between the base of the Soxhlet apparatus and the bottom-most supply reel, intermediate layers are placed which allow the solvent to penetrate to the parts of the supply reels which are to be contacted.
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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) | 1978-10-06 | 1979-04-07 | 1979-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-06 | 1983-04-07 | 1983-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-06 | 1987-04-07 | 1987-10-07 | $7700.00 | Window Closed / Lapsed |