Filter retainer for water purification unit
US5540848A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 13, 1994 |
| Grant date | Jul 30, 1996 |
| Priority date | — |
| Expiry date | Dec 13, 2014 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC02F2303/185
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
Water to be purified swirls about a source of ultraviolet radiation to kill any microorganisms contained therein and flows through a carbon filter cartridge mounted about the ultraviolet source to remove any chlorine and particulate matter. The outflow from the carbon filter is again subjected to ultraviolet radiation to kill any microorganisms entrained in the water emanating from the carbon filter. An ozone generator may be incorporated to entrain ozone with the inflowing water to enhance killing of any microorganisms present and to oxidize any undesirable compounds. The cartridge filter has its annular support member at one end disposed adjacent a first annular ridge to establish an annular seal between the support member and the first annular ridge. An axially moveable disk includes a second annular ridge disposed adjacent the annular support member at the other end of the cartridge filter to establish an annular seal therebetween. A spring washer urges the disk toward the cartridge filter and urges the cartridge filter toward the first annular ridge to maintain the respective annular seals despite aging or degradation of the annular support members of the cartridge filter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.