Animal husbandry – Aquatic animal culturing – Aquarium
Reexamination Certificate
1999-08-25
2001-03-20
Poon, Peter M. (Department: 3644)
Animal husbandry
Aquatic animal culturing
Aquarium
C210S167150
Reexamination Certificate
active
06202597
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention relates to a filter for aquaria, particularly to one having strong filtering capacity by means of plural layers of filtering and toxic removing.
A known conventional filter for aquaria shown in
FIG. 1
, includes a filter plate
2
for filtering comparatively large particles and a second filter net
3
for filtering rather tiny particles out of water, which is then sent back repeatedly into an aquarium A.
However, the known conventional filter for aqauria is not ideal, with fish easily dying, having the following disadvantages.
1. Filtering effect is not good, needing frequent washing of an aquarium and changing of water. It has only one layer of filtering with large holes
22
formed in the filtering plate
2
so as not to let water directly brim out. Therefore filtered water still mixes with miscellaneous dirty matters such as feed remains, waste etc., producing toxic by decomposing by bacteria, resulting in frequent washing and changing of water.
2. In taking it off, miscellaneous matters may easily fall into an aquarium. Some filters includes sand and filter stones, so miscellaneous matters attaching on them may easily fall down into water in changing them, resulting in bad water quality and death of fish.
3. In replacing it, filter nets have to be changed as well. Filtered matters on the second net layer
3
may directly drop into water in an aquarium owning to bad filtering of the filter plate
2
, liable to let bacteria or moss propagate in water, spoiling water quality. In addition, the second filter net
3
is hard to judge its quality by observation from outside, sometimes to be delayed in replacing with a new one.
SUMMARY OF THE INVENTION
This invention has been devised to offer a filter for aquaria replaceable with a new one in case of need, having a lower cost.
The feature of the invention is a bag-shaped filter having an outer layer of filter cloth made of long fiber non-fabric and an inner layer filter net, a mouth inlet formed in one end and the other end closed to form an hollow interior passage. Then the mouth inlet is tightly connected to a connect tube through which the water of an aquarium flow into the hollow interior passage to seep out of and be filtered by the inner layer of filter net and the outer layer of filter cloth gradually out of the outer surface of the filter cloth to fall down into the aquarium again. Thus dirty water of the aquarium receives filtering process for a large area, and the filter may easily be replaced when it becomes too filthy.
REFERENCES:
patent: 2956507 (1960-10-01), Hutchinson
patent: 4622148 (1986-11-01), Willinger
patent: 4880531 (1989-11-01), Blake et al.
patent: 5246571 (1993-09-01), Woltmann
patent: 6051132 (2000-04-01), Flores
Abbott Yvonne R.
Dougherty & Troxell
Poon Peter M.
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