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| Number | Title | Issue Date |
| 4407720 | Method and apparatus for filtration of contaminated liquids A fully submerged rotatable drum type of filter has a perforate cylindrical surface through which contaminated liquid is pulled by a suction pump. The inner periphery of the drum is sub-divided into numerous narrow, shallow, elongated chambers open at one... | 10/04/1983 |
| 4405466 | Backwash method and apparatus The method and apparatus for filtering a liquid including a filter vessel divided into an upper filter compartment and a lower plenum compartment. An external vessel is positioned at or below the elevation of the tops of the filter element fittings in the... | 09/20/1983 |
| 4402834 | Method for dewatering sludge-type material A process of dewatering sludge in which raw sludge and a flocculating agent are first mixed by suitable means, then fed into a rotary filter drum or similar device to effect thickening of the sludge and partial dewatering thereof. The now thickened sludge... | 09/06/1983 |
| 4382866 | Electro-chemical system for liquid filtration An electro-chemical system for liquid filtration for effecting removal of dissolved and suspended solids, undesirable ions, etc, therefrom, and decontaminating same, involving a basic electro-chemical filter device that comprises a canister of cylindrical... | 05/10/1983 |
| 4352734 | Method of filtering a fluid and filter A stream of water is filtered in a self-flushing type filter having filtering surfaces of different filtering fineness which provide a progressive filtering, firstly by fine filtering surfaces then by coarser filtering surfaces as the finer filtering surf... | 10/05/1982 |
| 4333839 | Filter system with improved blowdown collection and recirculation means A system for filtering liquids, such as coolant liquid from process machinery. The system includes an improved liquid storage tank having a partition dividing the tank into a clean tank for receiving clean liquid from a filter for return to the process ma... | 06/08/1982 |
| 4285821 | Filtering method A method of and an apparatus for the filtering of a fluid in which a filter-aid agent of a particulate or fibrous character is floated onto and deposited upon a support fabric in a fluid. The medium to be filtered is then passed through the filter layer f... | 08/25/1981 |
| 4282105 | Filter Disclosed is an improved liquid filter in which contaminated liquid is pumped into an inlet chamber, through a filter element, into an outlet chamber and out of the filter through an outlet pipe. The inlet and outlet chambers have compartments which hold ... | 08/04/1981 |
| 4246102 | Method for separating pollutants from liquid In the particular embodiment of the invention described in the specification, a liquid to be purified passes first through a screen, a sand trap, a first sedimentation basin, an aeration basin and a second sedimentation basin, and then through a final pur... | 01/20/1981 |
| 4240911 | Tower filters with reversed water-jet filter regeneration There is disclosed a method of filtering liquids in a vertical tower filter tank with a flat bottom and liquid inlet and outlet means for flowing liquid under pressure into a sand filter column in the tower tank causing the liquid to flow through distribu... | 12/23/1980 |
| 4219420 | Arrangement for and a process of filtering a contaminated medium A hollow filter housing is provided with a support and a plurality of fiber bundles located on the support. The fibers extend within the filter housing in direction between an inlet and an outlet of the housing. The contaminated medium is introduced into ... | 08/26/1980 |
| 4186092 | Vacuum belt filters The invention provides a discharge roller for a vacuum belt filter, over which a filter cloth of the filter passes, the roller having a channelling means in the form of a plurality of longitudinally directed and circumferentially spaced-apart passages whi... | 01/29/1980 |
| 4178246 | Separator for discrete solids from liquids Method and apparatus of concentrating solids from a suspension by feeding material in a liquid medium to a first zone that includes a vertically oriented foraminous filter basket supported by circular bands which are connected to an open frame basket supp... | 12/11/1979 |
| 4167482 | Filtering method and apparatus A filtering apparatus has a housing and a brush-like filter element in the housing. The filter element includes a support which is permeable to the liquid or gas to be filtered. A filtering medium is secured to the permeable support and is in the form of ... | 09/11/1979 |
| 4157962 | Filtration method and apparatus In the filtration cycle, a fluid such as water containing suspended solid waste matter is treated with a coagulating agent and gravity-fed through a plurality of individual filter cells, or modules, containing a particulate, coarse, granular filter media.... | 06/12/1979 |
| 4153547 | Use of acidified copper sulfate in hydrogen sulfide removal A method of treating well water for purposes of desulfurizing the well water and making it palatable. The water is treated with an excess of acidified copper sulfate or other metal salt and delivered into the top of a treating tank which contains a neutra... | 05/08/1979 |
| 4148727 | Method of decontaminating liquids A relatively compact and inexpensive technique for the two step decontamination of a liquid such as water is described. The liquid to be treated is propelled upwardly through a pair of vertically superposed, lower and upper chambers defined in a common tr... | 04/10/1979 |
| 4130485 | Novel filtration process and apparatus Process and apparatus for separating particulate material from fluids. Essentially, the process and apparatus involves passing a dispersion of particulate material in a fluid through a porous, solid tubular member, which can retain the particulate materia... | 12/19/1978 |
| 4123356 | Filter cleaning method and filter system A cleaning method of an etched disc filter and the system therefor, in which a plurality of discs having grooved surfaces are assembled or piled one on top of another. This filter is used for removing cruds and the like in a nuclear plant. For separating ... | 10/31/1978 |
| 4113618 | Method of and apparatus for solid-liquid separation Method of and apparatus for separation of solids from a liquid employs an elastic sheet filter which has pores of diameter larger than an average diameter of the solid and smaller than the maximum diameter thereof. The liquid is filtered under pressure by... | 09/12/1978 |
| 4043918 | Self cleaning filter assembly with fluttering inner filter member A hydraulic filter is provided with means for effectively cleaning its mesh filtering element during a flushing or "blow-down" cycle, wherein unfiltered liquid is passed rapidly along the surface of the tubular mesh to be exhausted from the filter substan... | 08/23/1977 |
| 4032442 | By-pass and synchronized blow system and method for rotary vacuum filters A method and system for use with rotary vacuum filters having a plurality of circumferentially spaced filter segments, for selectively applying blower air to the filter segments at predetermined rotational positions at which relatively unrestricted openin... | 06/28/1977 |
| 4029579 | Method and device for dewatering of suspensions A method and apparatus for dewatering a suspension of comminuted fiber material and liquid. A suspension is passed in a given direction in a container of generally circular cross-section having a hydraulic piston mounted generally concentrically therein. ... | 06/14/1977 |
| 3979289 | Filtration method Filtration in an internal rotary filter system is improved by externally impacting the filter screen as it rotates with a programmed spray of liquid that is varied from a relatively low to a relatively high pressure. In certain instances, this programmed ... | 09/07/1976 |
| 3975274 | Process and device for filtering media The invention relates to filter candles of the type in which the fluid medium flows through a circumferential wall into the interior of the filter and the particles are collected at the outside. The circumferential wall is formed of sectional members defi... | 08/17/1976 |
