US4494299A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of manufacturing solid electrolytic capacitors
Assignee: STC PLC
•
Filing: 1982-11-30
•
Granted: 1985-01-22
•
Expires: 2002-11-30
Abstract
Abstract Solid electrolytic capacitors are made in a batch process by etching a tantalum foil to form a number of rows of teeth, screen-printing tantalum powder ink onto the teeth, processing the sheet through sintering, anodizing and manganesing stages, sequentially encapsulating opposite edges of the rows of teeth in conductive epoxy and the "gap" with insulating epoxy and separating the individual capacitors from the rows.
Inventors
- 👤 Robert W. Franklin
- 👤 Peter F. Briscoe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:52
CPC Classifications
H; H01; H01G; H01G9/00; H01G9/0029
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
174 words
A method of manufacturing electrolytic capacitors comprising the steps of: forming groups of elongate formations each having a plurality of teeth distributed along its length on a substrate of a valve metal; applying a layer of a valve metal powder to one side of each of the teeth; sintering the valve metal powder to form a valve metal layer; anodizing the substrate and the metal layer to form a dielectric film; separating each of the groups from the substrate; manganizing the respective groups of formations at a predetermined region of each of the teeth; immersing part of the teeth into a bath of conductive material to form a first termination thereon; turning the respective groups so that the teeth extend in a direction opposite to that assumed during said immersing step; immersing a portion of the remainder of each of the groups into a bath of a conductive material to form a second termination thereon to such an extent to leave a gap between the terminations; and filling the gap with an insulation material.
Claim 2
Independent Claim
174 words
A method of manufacturing electrolytic capacitors comprising the steps of: forming groups of elongate formations each having a plurality of teeth distributed along its length on a substrate of a valve metal; applying a layer of a valve metal powder to one side of each of the teeth; sintering the valve metal powder to form a valve metal layer; anodizing the substrate and the metal layer to form a dielectric film; separating each of the groups from the substrate; manganizing the respective groups of formations at a predetermined region of each of the teeth; immersing part of the teeth into a bath of conductive material to form a first termination thereon; turning the respective groups so that the teeth extend in a direction opposite to that assumed during said immersing step; immersing a portion of the remainder of each of the groups into a bath of a conductive material to form a second termination thereon to such an extent to leave a gap between the terminations; and filling the gap with an insulation material.
Claim 3
Dependent Claim
23 words
The method as claimed in claim 1, wherein the forming step includes etching a foil from the group consisting of tantalum and niobium.
Claim 4
Dependent Claim
20 words
The method as claimed in claim 1, wherein the applying step includes screen-printing a pattern of powder onto the substrate.
Claim 5
Dependent Claim
18 words
The method as claimed in claim 3 further comprising, after the applying step, sintering the valve metal layer.
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) | 1988-01-22 | 1988-07-23 | 1989-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-01-22 | 1992-07-23 | 1993-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-01-22 | 1996-07-23 | 1997-01-22 | $7700.00 | Window Closed / Lapsed |