Sulfuration resistant chip resistor and method for making same
US7982582B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 13, 2008 |
| Grant date | Jul 19, 2011 |
| Priority date | — |
| Expiry date | Dec 8, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01C17/288
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A chip resistor includes an insulating substrate 11, top terminal electrodes 12 formed on top surface of the substrate using silver-based cermet, bottom electrodes 13, resistive element 14 that is situated between the top terminal electrodes 12 and overlaps them partially, an optional internal protective coating 15 that covers resistive element 14 completely or partially, an external protective coating 16 that covers completely the internal protection coating 15 and partially covers top terminal electrodes 12, a plated layer of nickel 17 that covers face sides of the substrate, top 12 and bottom 13 electrodes, and overlaps partially external protective coating 16, finishing plated layer 18 that covers nickel layer 17. The overlap of nickel layer 17 and external protective layer 16 possesses a sealing property because of metallization of the edges of external protective layer 16 prior to the nickel plating process.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.