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Actor Marlon Brando has four patents, all named "Drumhead tensioning device and method."
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| Number | Title | Issue Date |
| 7435351 | Filter apparatus backwash removal device and backwash removal method A filter media backwash removal method and device for transporting backwash fluid and solids away from re-entering a housing containing circulating filter media. ... | 10/14/2008 |
| 7309427 | System for treating liquids A system for treating wastewater includes a basin to contain wastewater, an aerator provided in the basin to mix the wastewater, and a cover system to cover a surface of the wastewater contained in the basin. The cover system includes a plurality of hollow bodies di... | 12/18/2007 |
| 7288194 | Underdrain system An underdrain system having a bottom formed of concrete. The concrete bottom includes a plurality of depressions formed therein. A porous plate is operably associated with at least one of the depressions. An anchor assembly is provided for anchoring the porous plate... | 10/30/2007 |
| 7273556 | Method for treating water containing manganese The invention concerns a method for treating water for human consumption, so as to eliminate manganese and possibly other metals comprising steps which consist in: causing said water to pass at least over a bed of filtering material (3) consisting at least pa... | 09/25/2007 |
| 7264912 | Method of producing photoresist Provided are a method of producing a photoresist comprising a process of filtrating a raw resist solution containing resist constituent components and a resist solvent dissolving them, using a filter made of at least one resin selected from fluorine-based resins and... | 09/04/2007 |
| 7141164 | Snap locking underdrain block An underdrain block for a filter system comprises a housing that has of a top wall, a bottom wall, a first end wall, a second end wall, a first side wall, and a second side wall. The end walls and the side walls connect the top wall to the bottom wall. The bottom wa... | 11/28/2006 |
| 7094344 | Filter device The present invention relates to a filter device for removing impurities contained in liquid. A filter housing 18 is provided with a container for accommodating a filter bag 2 therein, a deposit recovery tank 3 for recovering a deposit and a flo... | 08/22/2006 |
| 7090771 | Filtration system underdrain The invention is directed to a filter underdrain for supporting a filter media between at least two dividers forming at least one cell, which includes at least one porous plate for supporting the filter media for filtering a fluid, the porous plate spanning across a... | 08/15/2006 |
| 7063787 | Filter media retaining cap and hold down grid The invention recites a filtration tank including a chamber for holding liquid to be filtered, the filtration tank includes a fluid inlet for providing liquid to the chamber. The filtration tank further includes a fluid outlet and at least one filter block disposed ... | 06/20/2006 |
| 7001506 | Self-cleaning circulatin system and method The present invention provides a system and method for providing a self-cleaning water circulation system which may be utilized for a fish pond, fountain, or the like. Means for automatically cleaning the pump intake to avoid pump failure due to leaves and debris is... | 02/21/2006 |
| 6921481 | Automatic backwash filter system The invention is directed to an automatic backwash filter system that includes at least one influent port for introducing a fluid to the filter; a plurality of partitions forming a plurality of compartments for holding a filtering media for filtering the fluid; at l... | 07/26/2005 |
| 6790351 | Vertical filter A liquid filtering apparatus is placed in a vessel having a bed of filtration material and an intake for introducing unfiltered liquid, that includes a washbox, an airlifting tube extending from the washbox and including an intake end and means for introducing a pri... | 09/14/2004 |
| 6641737 | Vertical filter A liquid filtering apparatus is placed in a vessel having a bed of filtration material and an intake for introducing unfiltered liquid, that includes a washbox, an airlifting tube extending from the washbox and including an intake end and means for introd... | 11/04/2003 |
| 6517712 | Descending bed filter An improved vertical filtration unit which includes an airlift and a washbox designed for more efficient washing of dirt particles from the filtration material. The washbox consists of a filter media shield, and a washbox skirt for washing of the filtrati... | 02/11/2003 |
| 6402955 | Method for operating a membrane filter having a gas discharge cleaning means Operation of a membrane filter includes the step of selectively supplying gas into the compartments of a membrane unit 50 composed of an array of membrane elements 51 disposed within a treatment tank 31. A skirt element 71 is disposed at a bottom portion ... | 06/11/2002 |
| 6379549 | Method for treating water incorporating a sedimentation tank and a multilayer filter operating at high speeds The invention concerns a method for treating water to abate their content in suspended matter and, as the case may be in parasites, characterised in that it consists in causing said water to pass through at least one sedimentation tank (1) at a treatment ... | 04/30/2002 |
| 6319413 | Method of filtering liquid using a vertical filter Method of filtering liquid using a vertical filter, which includes media, an airlift, a washbox, a reject box, a filtrate chamber, and an effluent box. The method of filtration and media cleaning is automatic. The filtered liquid is collected by multi-car... | 11/20/2001 |
| 6306310 | Apparatus for distributing gas and liquid during concurrent gas/liquid backwash in filter underdrain flumes A concurrent backwash distribution apparatus for a filter having a filter tank and a plurality of underdrain laterals includes a baffle positioned in a common main conduit to define an auxiliary flume between the baffle and the underdrain laterals. The au... | 10/23/2001 |
| 6146539 | Treatment of swimming pool water Methods and compositions are disclosed for treating swimming pool waters in order to remove one or more nutrients necessary for algal growth and to accelerate the breakdown of objectionable chloramines within chlorinated pool waters. The target nutrients ... | 11/14/2000 |
| 6143188 | Underdrain block for filter media system An underdrain block for a filter media system for supporting the filter media and distributing air and water backwash. The underdrain block comprising a top wall, a bottom wall and two side walls forming an open ended interior. Interior walls, known as la... | 11/07/2000 |
| 6143186 | Device for continuous filtration of liquids A continuous filter device for liquids has a filter chamber that receives a granular bulk material forming a filter bed. The filter chamber has rectangular inner-walls with a liquid-permeable inlet side and a liquid-permeable outlet side positioned opposi... | 11/07/2000 |
| 6110389 | Filtration unit A filtration tank (1) for purification of polluted water includes a chamber (12). Upper and lower filtration screens (20, 22) are supported within the chamber. Filtration particles (18) are confined between the upper and lower screens. Polluted water ente... | 08/29/2000 |
| 6093329 | Air scour/backwash apparatus for celless traveling bridge filter A method of backwashing a filter includes a) supplying a backwash liquid via a conduit toward one end of a filter bed; b) aspirating air into the backwash liquid upstream of the bed; c) introducing a mixture of air and backwash liquid into the filter bed ... | 07/25/2000 |
| 5997750 | Community drinking water purification system This invention comprises a process and apparatus for producing purified drinking water from surface or ground fresh water sources using no chemical pre-treatment or coagulants, by usage of a positively-charged filtration media to attract the typically neg... | 12/07/1999 |
| 5893976 | Method for treatment of water The invention is directed to a water treatment system including a treatment tank having an ion-exchange mineral bed or filter bed therein, and a valve head assembly disposed on top of and in fluid communication with the treatment tank. The valve head asse... | 04/13/1999 |
| 5820767 | Method for quantitation of microorganism contamination of liquids Use of a disposable filtration capsule with a non-occluded membrane filter element in the place of a standard spiral wound cartridge allows for the more rapid and quantitative filtration, recovery, and quantitation of microorganisms in liquid, particularl... | 10/13/1998 |
| 5792359 | Sealing shoe for celless travelling bridge filter A backwash sealing shoe is provided for a filtration system including a tank having an undivided filtration bed and a plurality of side-by-side headers within the bed, each header in communication with a respective port in a wall of the tank. The sealing ... | 08/11/1998 |
| 5681472 | Method and apparatus for separating gaseous bubbles and sand from a liquid flow A filtering process for and apparatus separating air bubbles and granular filter medium from a filtrate contaminated by the filter medium and bubbles when passing through a filter bed formed by the filter medium for treatment of a suspension or liquid sol... | 10/28/1997 |
| 5660733 | Sewage dewatering process A process of dewatering primary-treated sewage which includes mixing the sewage with a coagulant or flocculant aid, usually activated polymer. The sewage is then mixed and flocculated at conditions which involve extensive mixing turbulence of the sewage a... | 08/26/1997 |
| 5639384 | Apparatus and method for improving gas backwash in lateral underdrains An apparatus and method for gas backwashing a granular media supported upon a lateral underdrain is disclosed. The lateral underdrain includes a plurality of dispersion apertures therethrough and at least one liquid return conduit extending to a discharge... | 06/17/1997 |
| 5618431 | Method of cleaning floating filter medium for biological filtering apparatus A method of preparing and cleaning a floating filter medium for a biological cleaning apparatus includes the steps of forming a filter layer by placing in a treating tank a granular floating filter medium having a specific gravity of about 0.3 or less and... | 04/08/1997 |
| 5536417 | Methods and systems for prewashing automatic backwashing filters New methods are disclosed for improving the cleansing the plurality of seriate filter beds in automatic backwash filtering systems, equipped with a traveling backwash shoe, in which the beds are backwashed one at a time with backwash liquid from an efflue... | 07/16/1996 |
| 5489388 | Apparatus and method for improving gas backwash in lateral underdrains An apparatus and method for gas backwashing a granular media supported upon a lateral underdrain is disclosed. The lateral underdrain includes a plurality of dispersion apertures therethrough and at least one liquid return conduit extending to a discharge... | 02/06/1996 |
| 5472610 | Blowing a gas into a granular filter bed A gas is blown into a filter (1) having a granular filter bed such that the gas flows into the bed along at least one elongate free edge disposed in the bed.... | 12/05/1995 |
| 5466379 | Method of removing oil and oil like environmental contaminants from water of ground surfaces Oil and oil products are adsorbed with a three-dimensional lattice structure formed by coating individual glass fibers, assembling them and drying them at a temperature of about 150° C. so that the structure will have; sufficient capillarity to pick up s... | 11/14/1995 |
| 5464543 | Rapid gravity filter backwash system and filters relative thereto A rapid gravity downflow filtration system applicable to a bank of several filters in which filtered water for backwashing is stored at a relatively high level in a common washwater storage compartment serving all filters and in which the filtered water f... | 11/07/1995 |
| 5458788 | Plastic media filter A filter for removal of biochemical oxygen demand and suspended solids utilizing multi-layer filtration media. The filter media includes plastic particles, sand, and garnet and is operated under an automatic control condition. Fine filtering is accomplish... | 10/17/1995 |
| 5314630 | Systems and methods for clarifying liquids A method of washing an upflow filter between service runs employs a filter bed having a non-buoyant particulate filter layer through which influent to be filtered is directed in an upward direction, and through which liquid employed in the washing operati... | 05/24/1994 |
| 5296138 | Underdrain for liquid purification systems An underdrain lateral for a liquid purification system is described. The lateral has three chambers, a primary chamber, a compensating chamber, and gas chamber. Turbulence is minimized during cleansing of the purification media by isolating the gas from t... | 03/22/1994 |
| 5252231 | Process and reactor for water treatment using a granular bed adapted to float during cleaning A process for the treatment of water using a granular bed (3) of granular support materials of a volumic mass less than that of the water to be treated. According to this process, each washing cycle comprises interrupting the withdrawal of treated water a... | 10/12/1993 |
