Patent US3731371A successfully refreshed from Google Patents.
US3731371A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solid electrolytic capacitors and process
Assignee: Kemet Electronics Corp
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Filing: 1971-03-22
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Granted: 1973-05-08
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Expires: 1991-03-22
Abstract
Abstract The fabrication of hermetically sealed, radially leaded solid electrolytic capacitors by first forming a high temperature hermetic seal between a metallized ceramic header and a metal sleeve, and then inserting a solid electrolytic capacitor having a first lead wire welded to the capacitors anode lead in the sleeve with the nickel lead wire extending through a metallized opening in the header, solder sealing the other end of the metal sleeve, bonding the first nickel wire to the header as an anode lead and bonding a second nickel wire to the header as a cathode lead.
Inventors
- 👤 J Piper
- 👤 R Raschiotto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:14
CPC Classifications
H; H01; H01G; H01G9/00; H01G9/004; H01G9/008; H01G9/08; H01G9/10
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
23 words
The process of claim 1 wherein the sealing of the header to the sleeve is done by high temperature soldering using silver-containing solder.
Claim 2
Dependent Claim
18 words
The process of claim 1 wherein the sealing of the header to the sleeve is done by brazing.
Claim 3
Dependent Claim
52 words
The process of claim 1 wherein the header has a metallized peripheral portion comprising at least a metallized strip extending around the periphery of the underside of the header whereby the header is mounted on the open end of the sleeve with the metallized portion abutting the rim of the sleeve opening.
Claim 4
Dependent Claim
79 words
The process of claim 1 wherein the header is of a size and configuration to fit inside the open end of the sleeve and wherein the metallized peripheral portion of the header comprises at least a metallization of the side edges thereof and a strip extending around the periphery of the upper side of the header whereby the header is mounted in the open end of the sleeve and the seal made to the metallized surfaces of the header.
Claim 5
Dependent Claim
68 words
The process of claim 1 wherein the header is provided with a metallized peripheral portion comprising a continuous metallization of the sides of the header, a strip extending around the upper surface of the header and a metallized portion on said upper surface spaced apart from the metallized opening in said header, whereby the second solderable metal lead wire is mounted on and bonded to said metallized portion.
Claim 6
Dependent Claim
25 words
The process of claim 1 wherein the header sleeve assembly of step (a) is tested for seal integrity before the capacitor body is inserted therein.
Claim 7
Dependent Claim
80 words
The process of claim 1 wherein after the sealing of the header to the sleeve, the first solderable metal wire is passed through the metallized opening in the header to extend out of the bottom of the sleeve and then the depending end of said wire is welded to the anode lead of the capacitor body, and the capacitor body then drawn into the sleeve by pulling the free end of the solderable metal wire upwards through the metallized opening.
Claim 8
Dependent Claim
30 words
The process of claim 8 wherein the depending end of the solderable metal wire is bent in an L-shape and the anode lead welded to the leg of the L.
Claim 9
Dependent Claim
132 words
The process of claim 1 wherein the header is provided with two metallized openings therethrough, spaced apart and insulated from each other, and wherein the free ends of a hairpin shaped piece of solderable metal wire are each passed through one of the openings in said header after the header is sealed to the sleeve, and wherein one of the free ends of the wire is welded to the anode lead of the capacitor and the other is soldered to the metallized surface of the capacitor, and wherein the capacitor body is drawn into the sleeve by pulling the hairpin shaped wire upwards, and wherein the two wires are each sealed in the metallized openings in the header and the bent end of the wire subsequently severed to provide separate electrical leads.
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) | 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 |