System and method for controlling the application of acid etchers or cleaners by means of color-changing dye
US8133403B2 · kind B2 · utility
1Cited by
48References
9Claims
0Family size
Assignee
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Key dates
| Filing date | Jul 31, 2007 |
| Grant date | Mar 13, 2012 |
| Priority date | — |
| Expiry date | Apr 5, 2029 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B2111/82
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
An acidic etcher solution for etching a substrate's surface. The acidic etcher solution includes an acid and a pH indicator, the pH indicator having at least one color transition at a pH below 7. The acidic etcher solution having an initial color at an initial pH when applied to the surface to allow determination of the evenness of the coating and the etcher having a second color at a second pH higher than the first pH wherein visual inspection allows for a determination that the etcher is substantially finished reacting.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.