Etching tank in which the solution circulates by convection
US4302273A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 4, 1980 |
| Grant date | Nov 24, 1981 |
| Priority date | — |
| Expiry date | Jun 4, 2000 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S134/902
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
Direct, but guided, natural convection circulates the treatment solution in a treatment tank during an exothermic reaction because the exothermic-reaction zone is horizontally isolated from a heat transfer or solution temperature adjustment zone. A vertically extending partition system in the middle portion (top-to-bottom) of the tank prevents the solution from flowing direclty between the exothermic-reaction zone and the heat transfer zone thereby limiting solution flow between these zones to the portions of the tank above and below the flow obstructing part of the partition system. This induces macroconvective circulation of the solution within the tank and obviates the need for mechanical stirring during material treatment.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.