Method of terminating lead filled capacitor
US4881308A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 1, 1988 |
| Grant date | Nov 21, 1989 |
| Priority date | — |
| Expiry date | Jul 1, 2008 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/49163
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A method of manufacturing a ceramic capacitor of the lead filled type includes coating the ends of the ceramic monolith with a terminating paste incorporating oxidizable metal particles characterized in that the lead will not wet to oxides of the metals but will wet to unoxidized or lightly oxidized increments of the metals. The paste is fused in an oxidizing environment or is fused in an inert environment and thereafter heated in an oxidizing environment with the result that the metal increments adjacent the exterior of the fused coating are oxidized whereas the metal at the interior portions of the paste are unoxidized or only slightly oxidized. Upon metal injection, the lead will wet to the interior portions of the fused paste but will not wet to the exterior of the paste whereby injected chips may be readily separated and whereby the size of the chip is rendered predictable due to the absence of adherent lead.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.