Patent US3581159A successfully refreshed from Google Patents.
US3581159A
Expired / Lapsed
US
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Solid electrolyte capacitor having improved counterelectrode system
Assignee: Kemet Electronics Corp
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Filing: 1969-11-12
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Granted: 1971-05-25
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Expires: 1989-11-12
Abstract
Abstract A solid electrolytic capacitor and method for the production thereof comprising a body of an anodizable metal, an oxide layer produced by anodization of the body as a dielectric, a solid semiconductive electrolyte layer over the oxide, and an electrically conductive counterelectrode system consisting of a layer of carbon particles on the solid electrolyte, a thin-walled copper lamellar coating over the carbon layer, and an electrical connection to the copper lamellar coating.
Inventors
- 👤 John Piper
- 👤 Carl F Leitten Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:27
CPC Classifications
H; H01; H01G; H01G9/00; H01G9/004; H01G9/04; H01G9/042; H01G9/0425; H01G2/00; H01G2/02; H01G2/06; H01G2/065
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
93 words
A solid electrolytic capacitor comprising a porous anode body formed of sintered tantalum particles, an anodized dielectric oxide film formed on the exposed surfaces of said particles, a solid electrolyte layer of manganese dioxide covering the surface of the dielectric oxide film in the pores and on the surface of the anode body, a layer of carbon particles covering the manganese dioxide electrolyte, and a layer, over the carbon particles, of a thin-walled lamellar structure of microscopic leaflike particles of substantially oxide-free copper, disposed in overlapping relationship and interlocking with the underlying coatings.
Claim 2
Dependent Claim
27 words
The solid electrolytic capacitor of claim 2 in which a layer of cured silver-organic paint overlies the layer of carbon particles and underlies the copper lamellar coating.
Claim 3
Dependent Claim
24 words
The solid electrolytic capacitor of claim 2 in which the wall thickness of the copper lamellar structure is from about 0.0002 to 0.003 inches.
Claim 4
Dependent Claim
141 words
An unencapsulated solid electrolytic capacitor comprising a porous anode body of sintered tantalum particles, an anode lead extending therefrom having a first tantalum portion joined to the anode body and a second portion comprising a solderable metal joined to the tantalum portion, an anodized dielectric oxide film formed on the exposed surfaces of the particles forming the anode body and over at least part of the surface of the tantalum portion of the anode lead, a solid electrolyte layer of manganese dioxide covering the surface of the dielectric oxide film in the pores and on the surfaces of the anode body, a layer of carbon particles covering the manganese dioxide electrolyte, and a layer, over the carbon particles, of a thin-walled lamellar structure of microscopic leaflike particles of substantially oxide-free copper disposed in overlapping relationship and interlocking with the underlying coatings.
Claim 5
Dependent Claim
33 words
The solid electrolytic capacitor of claim 5 in which a layer of solder has been applied to the copper lamellar layer, said solder having a melting point between 200* C. and 300* C.
Claim 6
Dependent Claim
21 words
The solid electrolytic capacitor of claim 5 in which the wall thickness of the copper lamellar structure is about 0.001 inches.
Claim 7
Dependent Claim
27 words
The capacitor of claim 5 in which the second portion of the anode lead is a nickel member welded to the first portion in a transverse position.
Claim 8
Dependent Claim
47 words
The article of claim 8 which is joined to a substrate consisting of an insulating member having one conductive portion soldered to the copper lamellar coated portion of the capacitor, and a second conductive portion on said member soldered to the nickel portion of the anode lEad.
Claim 9
Dependent Claim
169 words
A solid electrolytic capacitor capable of use at a temperature of 200* C. comprising a porous anode body formed of sintered tantalum particles, a tantalum anode lead wire joined at one end to the anode body, a nickel lead wire extension welded to the other end of the tantalum lead wire, an anodized dielectric oxide film formed on the exposed surfaces of the tantalum particles forming the anode body and over at least part of the surface the tantalum lead wire, a solid manganese dioxide electrolyte covering the surface of the dielectric oxide film in the pores and on the surfaces of the anode body, a layer of carbon particles covering the manganese dioxide electrolyte, a layer, over the carbon particles, of a thin-walled lamellar structure of microscopic leaflike particles of substantially oxide-free copper disposed in overlapping relationship and interlocking with the underlying coatings, a layer of fused solder at least partially covering the copper lamellar layer, said solder having a melting point between 200* C. and 300* C.
Claim 10
Dependent Claim
44 words
The article of claim 10 which is enclosed in an open-mouthed metallic container by a solder connection to the copper lamellar coated anode, and wherein the nickel lead wire is insulated from the container and extends through a hermetic seal closing the container mouth.
Claim 11
Independent Claim
98 words
A method for producing a solid electrolytic capacitor comprising the steps of providing an anodizable metal anode having a continuous anodized dielectric oxide film on the surface thereof, forming a solid semiconductive electrolyte coating over the dielectric oxide film, forming a layer of carbon particles over the electrolyte coating, and thereafter directing a stream of at least partially fused, finely divided particles of substantially oxide-free copper through a nonoxidizing environment onto the surface of the carbon layer with the copper particles forming a lamellar coating and, together with the carbon layer, a counterelectrode over the solid electrolyte coating.
Claim 12
Independent Claim
151 words
A method for producing a solid electrolytic capacitor comprising the steps of forming a porous anode body of sintered tantalum particles having a continuous oxide film on the exposed surfaces of said particles, impregnating the porous body with a solution of a manganese salt convertible upon heating to manganese dioxide and heating the impregnated anode to convert the solution material to a manganese dioxide coating, applying a layer of carbon particles over the manganese dioxide coating, and passing substantially oxide-free, finely divided copper particles through a heated stream of nonoxidizing gas to at least partially fuse said particles and protect them from oxidation, and directing said stream of nonoxidizing gas and at least partially fused, finely divided particles of substantially oxide-free copper onto the surface of the carbon layer with the copper particles forming a copper lamellar coating and, together with the carbon layer, a counterelectrode over the solid electrolyte coating.
Claim 13
Dependent Claim
38 words
The method of claim 13 in which the layer of carbon particles if formed by applying an aqueous suspension of colloidal graphite over the manganese dioxide coating and drying said suspension to leave a layer of graphite particles.
Claim 14
Dependent Claim
22 words
The method of claim 13 in which molten solder is applied over the copper lamellar coating to form a solder coating thereon.
Claim 15
Dependent Claim
19 words
The method of claim 15 in which the solder is applied at a temperature in excess of 200* C.
Claim 16
Dependent Claim
54 words
The method of claim 13 in which the stream of copper particles is introduced into a heated stream of a nonoxidizing gas to at least partially fuse the copper particles and the heated stream containing the copper particles is then directed through a shroud of nonoxidizing gas onto the surface of the carbon layer.
Claim 17
Dependent Claim
22 words
The method of claim 17 in which the heated stream of nonoxidizing gas is the effluent of a nontransferred plasma arc torch.
Claim 18
Dependent Claim
12 words
The method of claim 17 in whicH the arc gas is argon.
Claim 19
Dependent Claim
12 words
The method of claim 17 in which the arc gas contains hydrogen.
Claim 20
Dependent Claim
18 words
The method of claim 13 in which the copper particles are of a size passing a 325 mesh.
Claim 21
Dependent Claim
18 words
The method of claim 13 in which the average size of the copper particles is about 20 microns.
Claim 22
Dependent Claim
12 words
The method of claim 13 in which the nonoxidizing gas is argon.
Claim 23
Dependent Claim
21 words
The method of claim 13 in which the copper lamellar coating is formed to a wall thickness of about 0.001 inches.
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) | 1974-05-24 | 1974-11-23 | 1975-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-24 | 1978-11-23 | 1979-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-24 | 1982-11-23 | 1983-05-25 | $7700.00 | Window Closed / Lapsed |