Aquarium filter

Year	Description
1991	Invention patented by Scott W. Gonnello on June 16th, 1991. Abstract: A filter apparatus for use with an aquarium tank comprises a filter housing with opposite front and rear walls and opposite end walls and a bottom wall defining an open topped construction. A hanger means is for suspending the filter housing in coplanar relationship with one of the aquarium tank walls. A J-shaped hanger clip defines a long leg extendable into the tank interior and a short leg extendable into the filter housing interior. Bolting is engageable through the short leg for bringing the wall of the tank and confronting wall of the filter housing into tightenable clamping position relative to each other. In the filter housing is an upper seat for upwardly supporting a splash box having an apertured bottom wall for water drainage and a filter compartment therebelow filled with a biological fiber wool for the filtering of the water charged thereinto and a return hose and complementary motorized pump for the return of the filtered water from the filter housing to the aquarium tank.
1991	Invention patented by Elio Marioni on November 6th, 1991. Abstract: Aquarium filter having a box-like body defining a first mechanical filtration region provided with mechanical-action filtration means and a second biological filtration region having a chamber provided with biological-action filtration masses which are crossed in a downward direction by fluid at low speed. The second region is provided, in a downward position, with a collection channel system which is connected to the intake duct of a recirculation pump and with a bypass opening which deflects part of the water arriving from the first region directly into the channel system.
1992	Invention patented by Eugene Danner on December 8th, 1992. Abstract: An externally-mounted aquarium filter assembly includes a tank which is supportable on a wall of an aquarium and partitions disposed in the tank for dividing the interior of the tank into a prefilter chamber and a post-filter chamber. The partitions include a pair of generally upstanding, spaced-apart first and second partitions, each of which has an opening therein to allow the passage of water from the prefilter chamber to the post-filter chamber and a raised partition base plate on which the partitions are supported, the partitions each defining an opening to establish communication between the chambers. A pair of filter cartridges are each independently removably mounted within one of the openings of the partitions so that water passing from the prefilter chamber to the post-filter chamber passes through the filter cartridges for trapping particulate matter in the water.
1994	Invention patented by Robert Logan on November 14th, 1994. Abstract: A filter system is provided for mounting on an aquarium tank to treat the water in the aquarium. The filter system comprises a plurality of filter chambers, each containing a different filter media. The filter chambers serve to filter particulate matter from the aquarium water. A heater is further provided for controlling and maintaining the temperature of the aquarium water. The filter system further includes a dry chamber including a biological medium to support the growth of beneficial bacteria on the medium. A particularly preferred type of media is a plurality of plastic biospheres. The beneficial bacteria serve to biologically treat the aquarium and eliminate ammonia and nitrites from the water. At least one buffering chamber including a buffering medium is provided for buffering the aquarium water and maintaining a predetermined alkalinity level for the water. An air pump serves to pressurize portions of said filter system and aerate the aquarium water.
1994	Invention patented by Robert I. Wiedemann on December 12th, 1994. Abstract: A filtration unit for an aquarium tank comprises a biological filter chamber which is cyclically exposed to air and water without the use of conventional syphon means. Alongside the chamber is a U-tube arrangement one branch of which communicates at its upper end with the upper region of the chamber. Compressed air is continuously admitted to the chamber, e.g. by bubbling up beneath its open bottom end. When the water in chamber drops to the level of the bend of the U-tube air in the chamber expells remaining water from the U-tube and is able to evacuate chamber, enabling it to refill with water.
Source: selected by the editor from original sources.

Aquarium filter

Invention: Aquarium filter