US3731354A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making a multilayer plastic chip capacitor
Assignee: Illinois Tool Works Inc
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Filing: 1972-03-10
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Granted: 1973-05-08
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Expires: 1992-03-10
Abstract
Abstract Multilayer chip capacitors and method of making whereby two-side metalized plastic strip material is wound in annular hoop form and opposite sides of hoop are pressed together to bond layers together. The metalized plastic strip is pre-coated with a very thin coating of a heat sealable material such as plastic which functions as a capacitor dielectric and also as a bonding agent. The marginal edges of the pressed hoop are sprayed with molten aluminum at high velocity which makes contact with the edges of the thin metalized layers and penetrates the plastic coating to also provide contact with marginal portions of the metalized electrode coatings. The flattened hoop is then sliced into a plurality of capacitors which can be made to have any value desired over a large range by cutting them to a particular width. Values can be controlled very precisely by first cutting and testing one capacitor and then altering the width of later cut capacitors relative to the tested one. The uncut capacitors can be stored and cut to value as needed.
Inventors
- 👤 C Rayburn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 02:33
CPC Classifications
H; H01; H01G; H01G4/00; H01G4/30; H01G4/304; H01G4/002; H01G4/018; H01G4/06; H01G4/14; H01G4/145; Y; Y10; Y10T; Y10T29/00; Y10T29/43; Y10T29/435; Y10T29/49; Y10T29/49002; Y10T29/49004; Y10T29/49789; Y10T29/49798
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
131 words
Method of making a capacitor comprising the steps of: metalizing overlapping electrode regions on both surfaces of a strip of dielectric material; applying a thin film coating of plastic dielectric which is thinner than said strip to at least both said overlapping metalized regions; pressing a plurality of said metalized and coated strips together under heat to laminate and fuse said plastic coatings to each other, applying a sprayed metal coating to edge faces of said capacitor with sufficient velocity for some of the sprayed particles to become embedded in the fused plastic coating, and in contact with marginal surface portions of the electrodes thereby providing electrically conductive terminations for said metalized regions, a substantial portion of which extends from said metalized regions, through said plastic coating, to said edge faces.
Claim 2
Dependent Claim
58 words
The method of claim 2 wherein said capacitor is wound in a generally hoop shape and compressed after winding into an elongated form in which the major portions of the lengths of each of its layers define a series of flat parallel planes, the length of said portions defining said flat planes being substantially greater than their thickness.
Claim 3
Dependent Claim
28 words
The method of claim 3 wherein said major portions of said compressed capacitor are sub-divided by cutting so as to form a plurality of discrete multilayer chip capacitors.
Claim 4
Dependent Claim
44 words
The method of claim 3 wherein the outer convolution of said dielectric strip is heat sealed to one or more underlying convolutions and positioned prior to compression of said hoop so as to end up after compression at one end of said elongated form.
Claim 5
Dependent Claim
57 words
The method of claim 3 wherein said molten particles are sprayed around one end of said capacitors so as to provide a continuous sprayed band along said marginal edge face and a portion of the end face of said capacitor, and a layer of solder applied over the portion of said sprayed band on said end face.
Claim 6
Dependent Claim
105 words
Method of making a multilayer plastic chip capacitor comprising the steps of convolutely winding a single web of two side metalized plastic having thin coatings of plastic on its metalized surfaces into a hoop having a plurality of convolutions of said web, sealing the outer convolution to the underlying convolutions, compressing said hoop to cause diametrically opposing portions of said hoop to come into contact and to further cause the thin plastic coatings between adjacent convolutions and between said opposing portions to bond to each other and exclude air from between said coatings, and cutting said compressed hoop into a plurality of discrete capacitor chips.
Claim 7
Dependent Claim
65 words
The method of claim 7 wherein said metalized plastic comprises a longitudinally continuous metallic electrode coating on each side of said web, the electrode coatings on opposite surfaces of said web overlapping each other except for a margin along one edge, each of said electrode coatings being subjected to a metal spraying operation on each of said margins prior to being cut into said chips.
Claim 8
Dependent Claim
68 words
The method of claim 7 wherein said metalized plastic comprises a series of longitudinally continuous metallic electrode coatings on each side of said web, the metallic coatings on each web surface being separated from each other by a series of cleared lanes in which said compressed hoop is cut, the cleared lanes on one side of said web being positioned intermediate the cleared lanes on the opposite side.
Claim 9
Dependent Claim
86 words
The method of claim 7 wherein said metalized plastic comprises a series of longitudinal metallic electrode coatings on each side of said web, the metallic coatings on each web surface being separated from each other by a series of longitudinal cleared lanes in which said compressed hoop is cut, the cleared lanes on one side of said web being positioned intermediate the cleared lanes on the opposite side, said metallic electrode coatings on both sides of said web being interrupted by transversely arranged aligned cleared areas.
Claim 10
Dependent Claim
40 words
The method of claim 10 wherein said hoop is cut initially along said longitudinal cleared lanes into a plurality of smaller hoops which are sprayed with metal on their marginal edges and then cut along said transversely arranged cleared areas.
Claim 11
Dependent Claim
58 words
The method of claim 10 wherein said hoop is cut along said longitudinal cleared lanes and said transversely arranged cleared areas into a series of capacitor chips having electrodes extending only to opposite side edges thereof, metal spraying each of said side edges and an adjoining end portion, and applying a coating of solder to said end portion.
Claim 12
Dependent Claim
121 words
The method of claim 7 wherein said metalized plastic comprises a longitudinal metallic electrode coating on opposite sides of said web, both edges of said web on each side thereof having cleared margin areas, said electrode coatings on each of the opposite sides of said web having spaced transversely cleared areas which are positioned intermediate the electrode coatings on the other side of the web, said webs being compressed so that the cleared areas on one web are slightly offset relative to the cleared areas in an adjacent layer, and cutting said compressed hoop at an acute angle to the plane of said compressed hoop so as to pass through said cleared areas and provide a beveled edGe on said chips.
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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) | 1976-05-07 | 1976-11-06 | 1977-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-07 | 1980-11-06 | 1981-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-07 | 1984-11-06 | 1985-05-08 | $7700.00 | Window Closed / Lapsed |