Hexavalent chromium free etch manganese recovery system
US10537824B2 · kind B2 · utility
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Key dates
| Filing date | Jul 10, 2018 |
| Grant date | Jan 21, 2020 |
| Priority date | — |
| Expiry date | Jul 10, 2038 |
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- Technology area (CPC —)General
Abstract
Methods for recovering manganese etchant solutions are provided wherein a process solution used to rinse or neutralize a nonconductive substrate after etching the substrate is collected and evaporated to provide a concentrated process solution that is fed back into the manganese etchant solution or acid rinse.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.