Clogging indicator for an aquarium filter
US5246571A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 22, 1992 |
| Grant date | Sep 21, 1993 |
| Priority date | — |
| Expiry date | Jul 22, 2012 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D35/26
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A filter flow indicator for use with a filter bag into which contaminated aquarium water is pumped which comprises a meter tube connected to a inlet tube by an effective venturi connection. Water flowing in the inlet tube flows across the venturi connection. The rate of flow in the inlet tube is related to the amount of clogging in the filter bag. An indication is included on the meter tube as to when the filter should be replaced. As the filter bag clogs, the flow rate on the inlet tube slows down causing the water level in the meter tube to increase. When the level of the water reaches the indication, the filter is sufficiently clogged so that it should be replaced.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.