Controlled induction by use of power supply trigger in electrochemical processing
US6440291B1 · kind B1 · utility
26Cited by
1References
19Claims
0Family size
Assignee
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Key dates
| Filing date | Nov 30, 2000 |
| Grant date | Aug 27, 2002 |
| Priority date | — |
| Expiry date | Nov 30, 2020 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC25D21/12
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
Methods and apparatus are used for triggering and controlling an initial induction period in which a substrate is immersed in an electrochemical bath prior to actual electrochemical processing. This is accomplished by sensing a change in cell potential upon immersion of the substrate or a counter electrode in an electrochemical bath. Appropriate logic then holds the cell potential or current at a fixed value for a defined delay period. After that period ends, the logic allows the cell potential or current to increase to a level where electrochemical processing begins.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.