Swimming pool filter system
US4578186A · kind A · utility
Inventor
Key dates
| Filing date | Sep 4, 1984 |
| Grant date | Mar 25, 1986 |
| Priority date | — |
| Expiry date | Sep 4, 2004 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D37/02
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A swimming pool filter system is comprised of a pump, a filter and a water conduit means for hydraulically connecting the pump and filter in a hydraulic loop with a swimming pool. The filter is a Hayward regenerable filter wherein the diatomaceous earth coating may be periodically shaken off the filter membrane to mix with the dirt and recoat the membrane several times between cleanings to extend the time between filter cleanings. A pressure sensitive switch, mounted at the filter inlet port, closes when the inlet pressure exceeds a predetermined magnitude to energize an alarm each time regeneration is needed or after five regenerations when cleaning will be required.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.