Filter apparatus
US4702833A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 26, 1986 |
| Grant date | Oct 27, 1987 |
| Priority date | — |
| Expiry date | Feb 26, 2006 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D29/661
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A filter apparatus is disclosed having a multi-stage filter tower and a plurality of liquid reservoirs, each reservoir having an approximately horizontal filter surface at its lower surface. The reservoirs are connected to each other centrally and in a vertical direction, with such communication causing an inflow clearance between the upper surface of each reservoir and the filter surface. The multi-stage tower is provided within a tank having a liquid inlet, a liquid outlet, and a drain spout, which are controlled by valves. The interior of the filter tower is connected with the liquid outlet of the tank and the filter tower has a head connected with a source of pressurized air via a valve arrangement. The apparatus according to the invention provides for the advantageous, economical and efficient washing of filter surfaces that become clogged during the filtration and purification process.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.