US3921041A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dual capacitor
Assignee: American Radionic Co Inc
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Filing: 1975-02-24
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Granted: 1975-11-18
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Expires: 1995-02-24
Abstract
Abstract A dual metallized capacitor and method for making the same. A single capacitor section is wound in the usual manner from two metallized films. After the winding has progressed through the proper number of turns for one of the capacitors, the metallized layer is burned from the surface of one film over a selected distance. An insulated sheet having a length sufficient to encircle the capacitor at least once, is inserted between the film layers to extend beyond one end of the wound cylinder. Winding is then completed and each end of the wound section is metal plated. Two leads are secured to the plated end from which the insulating sheet extends, one lead being placed within, and the other without, the sheet. A single lead is secured to the opposite end of the capacitor section.
Inventors
- 👤 Robert M Stockman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:30
CPC Classifications
H; H01; H01G; H01G4/00; H01G4/32; H01G4/38; H01G4/385; Y; Y10; Y10T; Y10T29/00; Y10T29/43; Y10T29/435
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
206 words
The method of making a dual metallized film capacitor which comprises: providing a supply of a first dielectric film strip metallized on one side thereof; providing a supply of a second dielectric film strip metallized on one side thereof; winding said first and second strips in substantially cylindrical form with the non-metallized sides of each strip in contact with the metallized side of the other strip, the metallized edge of said first strip being exposed at one end of said cylindrical form and the metallized edge of said second strip being exposed at the other end of said cylindrical form; removing the metallized layer from said first strip over a region intermediate the ends of said first strip; inserting between said region and said second strip a sheet of insulating material positioned to extend outwardly from said one end of said cylindrical form and of a length sufficient to encircle the circumference of said form at said region at least once; continuing said winding for a predetermined length of film; terminating said winding; metal coating each end of the capacitor so formed; and securing to said one end of said form a first electrical lead within said sheet and a second electrical lead without said sheet.
Claim 2
Independent Claim
206 words
The method of making a dual metallized film capacitor which comprises: providing a supply of a first dielectric film strip metallized on one side thereof; providing a supply of a second dielectric film strip metallized on one side thereof; winding said first and second strips in substantially cylindrical form with the non-metallized sides of each strip in contact with the metallized side of the other strip, the metallized edge of said first strip being exposed at one end of said cylindrical form and the metallized edge of said second strip being exposed at the other end of said cylindrical form; removing the metallized layer from said first strip over a region intermediate the ends of said first strip; inserting between said region and said second strip a sheet of insulating material positioned to extend outwardly from said one end of said cylindrical form and of a length sufficient to encircle the circumference of said form at said region at least once; continuing said winding for a predetermined length of film; terminating said winding; metal coating each end of the capacitor so formed; and securing to said one end of said form a first electrical lead within said sheet and a second electrical lead without said sheet.
Claim 3
Dependent Claim
25 words
The method of claim 1 wherein said metallized layer is removed by contacting it with an energized electrode and moving said first strip relative thereto.
Claim 4
Dependent Claim
19 words
The method of claim 1 wherein said metal coating comprises spraying the ends of said capacitor with molten metal.
Claim 5
Dependent Claim
12 words
The method of claim 3 wherein said leads are secured by soldering.
Claim 6
Dependent Claim
19 words
The method of claim 2 wherein said metal coating comprises spraying the ends of said capacitor with molten metal.
Claim 7
Dependent Claim
12 words
The method of claim 5 wherein said leads are secured by soldering.
Claim 8
Dependent Claim
156 words
A dual capacitor which comprises: a capacitor section wound from first and second lengths of metallized dielectric film to form respective first and second layers of metal separated by dielectric film, the metallized first layer extending to the first end of said section and the metallized second layer extending to the second end of said section, a portion of the metallized first layer being removed at a region intermediate the ends of said first length for a distance sufficient to encircle said section at least once; a non-conductive sheet inserted between said lengths and extending outwardly from the first end of said section adjacent said region to form a circular barrier separating the metallized portions of said first length; means for making electrical contact with said first metallic layer within said barrier; means for making electrical contact with said first metallic layer without said barrier; and means for making electrical contact with said second metallic layer.
Claim 9
Dependent Claim
156 words
A dual capacitor which comprises: a capacitor section wound from first and second lengths of metallized dielectric film to form respective first and second layers of metal separated by dielectric film, the metallized first layer extending to the first end of said section and the metallized second layer extending to the second end of said section, a portion of the metallized first layer being removed at a region intermediate the ends of said first length for a distance sufficient to encircle said section at least once; a non-conductive sheet inserted between said lengths and extending outwardly from the first end of said section adjacent said region to form a circular barrier separating the metallized portions of said first length; means for making electrical contact with said first metallic layer within said barrier; means for making electrical contact with said first metallic layer without said barrier; and means for making electrical contact with said second metallic layer.
Claim 10
Dependent Claim
28 words
The capacitor of claim 7 wherein said means for making contact with said first layer comprises: a layer of metal deposited on the first end of said section.
Claim 11
Dependent Claim
41 words
The capacitor of claim 8 wherein said means for making contact with said first layer comprises: a first electrical lead connected to said metal layers within said barrier; and a second electrical lead connected to said metal layer without said barrier.
Claim 12
Dependent Claim
28 words
The capacitor of claim 9 wherein said means for making contact with said second layer comprises: a layer of metal deposited on the second end of said section.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-11-17 | 1979-05-19 | 1979-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-17 | 1983-05-19 | 1983-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-17 | 1987-05-19 | 1987-11-18 | $7700.00 | Window Closed / Lapsed |