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| Number | Title | Issue Date |
| 7163630 | Method and apparatus for enhancing filter bed performance In a vessel containing a filter bed and containing a mixed liquor containing suspended solids, a system disturbs/dislodges a sludge mat that settles on the filter bed. Thus, the system controls the sludge mat on the filter bed that otherwise may blind the filter bed... | 01/16/2007 |
| 7097766 | Sand filter with rotating vanes The present invention is a media-based fluid filtration system that extends the time between backwashing operations and prevents the agglomeration of filtered particles at the top of the media bed through the use of a plurality of rotating vanes and associated tines... | 08/29/2006 |
| 6890440 | Method and apparatus for enhancing filter bed performance In a vessel containing a filter bed and containing a mixed liquor containing suspended solids, a system disturbs/dislodges a sludge mat that settles on the filter bed. Thus, the system controls the sludge mat on the filter bed that otherwise may blind the filter bed... | 05/10/2005 |
| 6802970 | Fluid treating device A fluid-treating device containing a distributing device having a revolving disc in a stationary housing, and a motor for rotating the disc. Feed and discharge pipes are connected to an end wall of the housing and open onto the revolving disc. Stationary vessels are... | 10/12/2004 |
| 6280619 | Inline filter having swivel fitting An inline filter having a swivel right-angle fitting for coupling an inlet or outlet tube. The fitting includes a stem having a pair of O-rings and a distal ridge and notch. The cap of the filter includes a port having a plurality of annular, resilient ta... | 08/28/2001 |
| 5902488 | Slow sand filter A slow sand filter system having a slow sand filter located under water and a scraping mechanism. The scraping mechanism has at least one auger and a shaft, the auger extending across the width of the slow sand filter and being supported in the center the... | 05/11/1999 |
| 5061080 | Rotary agitator A rotary agitator for use in filter systems has a horizontal arm formed of a single, elongate, hollow tubular section. An opening through the peripheral wall of the tubular section at substantially the midpoint thereof communicates with the hollow interio... | 10/29/1991 |
| 4828715 | Cleaning and disposal of carbon black and ash containing wastewaters Carbon black and ash containing wastewaters from high-temperature processes in which the carbon black is present in an extremely finely divided and partly colloidal state are cleaned and disposed of by treatment with organic flocculants, predewatering of ... | 05/09/1989 |
| 4655908 | Device for cleaning liquids in sand filters The present invention relates to a device for cleaning of liquids in sand filters of the up-stream type. The device according to the invention is characterized in that a sand filter bed (5) is arranged in the form of at least one ring-shaped element, whic... | 04/07/1987 |
| 4425144 | Recovery of carbon black A layer of particles of carbon black is used as a filtration medium in the separation of carbon black from a gaseous stream containing carbon black.... | 01/10/1984 |
| 4399042 | Filter devices and methods Filter elements are constructed of an array of parallel, spaced-apart rods, a plurality of spaced-apart bars fixed normal to the rods on one side of the array forming a multitude of cavities between the bars and above the surface of the array. Filter medi... | 08/16/1983 |
| 4156647 | Process and apparatus for removal of impurities from liquids A unit is disclosed for removal of impurities present in liquids such as waste water effluent. The unit comprises a vessel containing a loose quantity of particulate treating material for absorption or reaction with the impurities in the liquid. A wall of... | 05/29/1979 |
| 4113183 | Nozzle for rotary filter pipe In sand type filters, a pipe is often diposed beneath the surface of the sand bed and is rotatable on a vertical axis, located in the middle of the length of the pipe, horizontally and has nozzles extending along the trailing side of the pipe on each side... | 09/12/1978 |
