Multi-stage EDM filter
US6881330B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 19, 2002 |
| Grant date | Apr 19, 2005 |
| Priority date | — |
| Expiry date | Jul 22, 2022 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D29/58
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A two-stage, retrofit filter is adapted for use with an electrical discharge machine (EDM) includes nested inner and outer filtering elements that may be placed as a unit in the same tank and over the apertured standpipe used for a one-stage filter, such that the fluid to be filtered now flows through each of the multiple filter elements. The retrofit EDM filter may be configured for flow in either direction, though the usual arrangement is one whereby the fluid being filtered flows up through the bottom of the tank, out the apertured standpipe, and into the inner filter element. Preferably, the filter elements are cylindrical, pleated elements composed of a technical grade filter paper. In the preferred embodiment, a pressure-operated release valve is provided in conjunction with the inner filter, such that when a predetermined pressure is reached due to the entrapment of contaminants by the inner filter, the valve opens to allow the fluid to be filtered to flow through the outer filter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.