Portable metal extraction machine and method of using
US5456738A · kind A · utility
5Cited by
12References
8Claims
0Family size
Inventor
Key dates
| Filing date | May 9, 1994 |
| Grant date | Oct 10, 1995 |
| Priority date | — |
| Expiry date | May 9, 2014 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/53274
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A process and apparatus for extracting gold from circuit boards, gold fingers and gold pins is described comprising the steps of applying liquid nitrogen directly to the surface of the circuit boards, gold fingers and gold pins, thus freezing the gold. A vibration is then instituted to loosen the gold from the substrate to which it was attached. The gold flakes or particles are then collected by a high powered vacuum apparatus.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.