Foundry sand with oxidation promoter
US6673141B2 · kind B2 · utility
1Cited by
5References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 30, 2002 |
| Grant date | Jan 6, 2004 |
| Priority date | — |
| Expiry date | Jul 30, 2022 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB22C9/123
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Coating foundry sand with a thin layer of an oxidation-promoting catalyst. Preferred catalysts comprise ferric and cupric oxides. The catalysts promote the oxidation of any polymeric binder or residues admixed with the sand. The sand is coated by wetting the grains with a solution of a catalyst precursor, drying the sand and baking the sand in air to convert the precursor to the catalyst.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.