Patent US3641640A successfully refreshed from Google Patents.
US3641640A
Expired / Lapsed
US
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Method of making metallized capacitors
Assignee: Illinois Tool Works Inc
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Filing: 1969-10-14
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Granted: 1972-02-15
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Expires: 1989-10-14
Abstract
Abstract Method of making a plurality of identical wound metallized capacitors from a strip of dielectric material which is metallized in a plurality of overlapping areas on both sides. The metallized dielectric strip has a plurality of clear or demetallized zones along its length which overlap each other. The method steps comprise: winding a portion of the strip containing a metallized area and a cleared zone into a capacitor; and simultaneously cutting the strips in the cleared zone and heat sealing the outer wraps of cleared dielectric to the underlying wraps of the capacitor. The metallized dielectric strip may be either wound together with a plain dielectric strip or may be wound without the need for a plain dielectric strip by winding it about an axis which generally coincides with a transverse line through the center of the metallized area. A photoelectric cell may be used to sense the presence of a clear area to initiate the cutting and sealing operation.
Inventors
- 👤 Charies C Rayburn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 12:54
CPC Classifications
H; H01; H01G; H01G13/00; H01G13/02; Y; Y10; Y10T; Y10T29/00; Y10T29/43; Y10T29/435
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
156 words
A method of forming a plurality of identical capacitors from a supply of metallized dielectric strip wherein the strip has a plurality of equal metallized areas on each of its sides arranged in spaced overlapping relationship along its length, said dielectric strip having a plurality of equal completely cleared elongated areas along its length separating said plurality of equal metallized areas, the method comprising: winding one of said plurality of metallized areas and a portion of the cleared areas of the dielectric strip adjacent both ends of the metallized area into a capacitor in which said cleared areas comprise a plurality of outer protective wraps; simultaneously cutting said metallized dielectric strip in the cleared area between an already wound metallized area and a succeeding metallized area attached to the supply and heat sealing the cut end of the dielectric strip to the capacitor convolutions underlying it; and repeating said steps of winding and cutting and sealing.
Claim 2
Independent Claim
156 words
A method of forming a plurality of identical capacitors from a supply of metallized dielectric strip wherein the strip has a plurality of equal metallized areas on each of its sides arranged in spaced overlapping relationship along its length, said dielectric strip having a plurality of equal completely cleared elongated areas along its length separating said plurality of equal metallized areas, the method comprising: winding one of said plurality of metallized areas and a portion of the cleared areas of the dielectric strip adjacent both ends of the metallized area into a capacitor in which said cleared areas comprise a plurality of outer protective wraps; simultaneously cutting said metallized dielectric strip in the cleared area between an already wound metallized area and a succeeding metallized area attached to the supply and heat sealing the cut end of the dielectric strip to the capacitor convolutions underlying it; and repeating said steps of winding and cutting and sealing.
Claim 3
Dependent Claim
67 words
The method of claim 1 wherein a companion strip of plain dielectric is wound together with said metallized dielectric strip, said metallized dielectric strip being cut during said cutting and heat sealing step intermediate the ends of the cleared area so that a cleared portion remains attached to the supply of metallized dielectric so as to provide an insulating core for the succeeding capacitor to be wound.
Claim 4
Dependent Claim
31 words
The method of claim 1 wherein said metallized dielectric strip is transversely folded at approximately the center of a metallized area and then wound about an axis parallel to the fold.
Claim 5
Dependent Claim
48 words
The method of claim 1 wherein the metallized areas on each side of the strip extend to only one edge of the strip and are spaced from the opposite edge by a narrow demetallized margin portion which overlies a metallized area on the opposite side of the strip.
Claim 6
Dependent Claim
49 words
The method of claim 2 wherein the metAllized areas on each side of the metallized strip extend to only one edge of the strip and are spaced from the opposite edge by a narrow demetallized margin portion which overlies a metallized area on the opposite side of the strip.
Claim 7
Dependent Claim
24 words
The method of claim 5 wherein the companion strip of plain dielectric is narrower than the metallized dielectric strip and is wound centrally thereof.
Claim 8
Dependent Claim
38 words
The method of claim 2 and further including the step of sensing the ability of the clear areas of the metallized dielectric strip to transmit light and controlling the winding and cutting and sealing steps, in response thereto.
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) | 1975-02-14 | 1975-08-16 | 1976-02-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-14 | 1979-08-16 | 1980-02-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-14 | 1983-08-16 | 1984-02-15 | $7700.00 | Window Closed / Lapsed |