Did You Know...
...that after Parker Brothers executives turned down the game of Monopoly because it had "52 fundamental errors" (including taking too long to play), a copy of the game wound up in the home of the company president who stayed up until 1 a.m. to finish playing it? He was so impressed by the game that the next day he wrote to inventor Charles Darrow and offered to buy it!
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| Number | Title | Issue Date |
| 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 |
| 6287474 | Liquid treatment media regeneration apparatus and process A deep bed liquid treatment apparatus and process in which the liquid and a granular media is periodically agitated to create a liquid-media slurry, and outflow of the liquid and entrained contaminants is induced through a separator having an inner diamet... | 09/11/2001 |
| 5989435 | Method for magnetically filtering wastewaters containing oil-coated mill scale Electro-magnetic filter apparatus and method of operating to separate and remove oily magnetic solids from wastewaters. The filter apparatus includes a filter assembly having an electro-magnetic coil that encircles a canister. The canister has an interior... | 11/23/1999 |
| 5811016 | Method and apparatus for removing sand from waste water loaded with sand and organic substances There are described a method of and an apparatus for removing sand from waste water loaded with sand and organic substances which is set forth in circulation in a vertical container (1) in which the organic substance moves upward to an overflow (13), whil... | 09/22/1998 |
| 5762801 | Process and apparatus for biological treatment of water In the biological purification of sewage water or drinking water, it is known to purify the water in a filter bed of granular filter medium, wherein the filter medium is transported from the bottom of the bed to its upper side with the aid of air, so as t... | 06/09/1998 |
| 5480553 | Hollow fiber membrane module A hollow fiber membrane module comprising (a) hollow fibers, (b) a fastening member for fixing the ends of the hollow fibers while leaving them open, and (c) a structural member for enclosing and supporting the fastening member, the hollow fiber membrane ... | 01/02/1996 |
| 5445740 | Floating media biofilter A floating media biofilter is provided, comprising a tank having a bottom and a sidewall, the sidewall having a lower portion inwardly sloping toward the bottom. Floating media are present in the tank for forming a media pack when the tank is filled with ... | 08/29/1995 |
| 5344574 | Separation of oil from transformer filter cake The separation of oil from filter cake, such as a transformer filter cake, is achieved by contact mixing filter cake with protein additives in water for a sufficient time for substantially all the oil to be displaced from the filter cake, flushing displac... | 09/06/1994 |
| 5290458 | Granular media regeneration process Regeneration of a granular media is produced by mechanically forming a slurry of the media in a liquid and separation of the liquid from the granular media by rapidly rotating a separator element having small openings through the slurry, as flow of a liqu... | 03/01/1994 |
| 4842744 | Method for continuous filteration of fluids By this method, the fluid to be filtered is led through a filter bed formed of particulate filter particles, such as sand, which filter bed is retained in an upstanding annular space. The fluid is introduced to the interior part 15 of the annular space an... | 06/27/1989 |
| 4840737 | Process for separating solid particles and/or liquid from a suspension and wash column The invention is directed to a process for separating solid particles and/or liquid from a liquid suspension and/or purifying or leaching solid particles in a column containing a compacted bed, which comprises supplying a liquid suspension to said column ... | 06/20/1989 |
| 4818419 | Method of removing clogging material from a clogged granular filter medium A method of cleaning and removing clogging material from a clogged granular filter medium of a granular filter device is disclosed. A collector is positioned proximate the clogged filter medium for collecting the clogged filter medium together with a port... | 04/04/1989 |
| 4719020 | Process for concentrating a suspension of microscopic particles According to the invention, the enclosure (1) contains a granular material (4) having a specific mass less, or respectively greater than that of the liquid to be treated. When the liquid is admitted through an upper inlet line (2), a granular bed is forme... | 01/12/1988 |
| 4560484 | Method and apparatus for magnetically separating particles from a liquid A method and apparatus are disclosed for magnetically separating particles from a liquid, which particles include diamagnetic, non-magnetic and/or very weakly paramagnetic particles. To achieve separation, the magnetic susceptibility of the liquid is modi... | 12/24/1985 |
| 4547286 | Water filtration process and apparatus having upflow filter with buoyant filter media and downflow filter with nonbuoyant filter media High rate filtration system includes an upflow filter vessel containing a bed of buoyant media followed by a downflow filter vessel containing a bed of nonbuoyant media. The upflow filter vessel is unobstructed by cross-sectional, media-confining screens.... | 10/15/1985 |
| 4443341 | Process and apparatus for removal of solids from liquids A filtration process and apparatus for the removal of solids from liquids is provided having a filter bed vertically disposed in a chamber which has a solids-containing liquid passed horizontally therethrough. The filter bed is regenerated after becoming ... | 04/17/1984 |
| 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 |
| 4328105 | Treatment of suspended solids--and adsorbable contaminant--containing liquid A process for removal of suspended solids and adsorbable contaminants from an influent liquid containing same. A filter bed of porous polyurethane particles is provided, and a particulate adsorbent selective for the adsorbable contaminants is placed into ... | 05/04/1982 |
| 4289630 | Filter cake removal method and apparatus The exhaust manifold in a pressure filter is spring mounted and vibrated along a vertical axis to dislodge filter cakes from filter tubes suspended from the manifold.... | 09/15/1981 |
