Filter apparatus and method
US6428708B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 7, 2000 |
| Grant date | Aug 6, 2002 |
| Priority date | — |
| Expiry date | Mar 7, 2020 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC02F2209/445
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A filtering apparatus including a fluid monitoring head and a replaceable filter cartridge removably fastened to the head. The fluid monitoring head includes a shut off mechanism for interrupting fluid flow through the cartridge when a predetermined quantity of fluid has been treated by the filter. The filter cartridge is releasably coupled to the shutoff mechanism when the filter is installed. The shut off mechanism includes a valve element carried by a shaft that forms part of a driven member forming part of the monitoring head. A biasing element exerts a force on the valve element carrying shaft tending to move the valve to a flow blocking position. The shaft engages a keeper or hold off element threadly retained in the filter cartridge. As the driven member rotates, the keeper element is gradually unthreaded until it separates from the filter cartridge, allowing the force of the biasing element to move the valve member into a flow interrupting position. A pressure relief means in the monitoring head allows for easy removal of the cartridge from the monitoring head.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.