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| Number | Title | Issue Date |
| 4608181 | Water filtration apparatus having upflow buoyant media filter and downflow nonbuoyant media filter A water filtration system is provided by an upflow filter vessel containing a buoyant filter media in series with a downstream downflow filter vessel containing a nonbuoyant filter media. The buoyant media filter vessel and nonbuoyant media filter vessel ... | 08/26/1986 |
| 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 |
| 4390284 | Method and apparatus for wetting powder A high kinetic energy water spraying apparatus wets powdered or granular dry material, particularly hard-to-wet polymers, to provide a lump-free solution of a controlled concentration. A volumetric feeder drops the dry material through a fructoconical upp... | 06/28/1983 |
| 4199451 | Split flow water treatment plant A split flow water treatment plant includes a settling basin comprising a pair of banks of generally horizontally extending settling tubes and an inlet baffle comprising a plurality of parallel vertical perforated sheets upstream of and adjacent to each o... | 04/22/1980 |
| 4132362 | Spray head A spray head apparatus having a liquid deflecting back plate which utilizes the Coanda effect to achieve a widely dispersed spray pattern is disclosed. The back plate is vertically movable and is positioned above and biased toward the upwardly facing open... | 01/02/1979 |
| 4094785 | Suction clarifier method A self-cleaning siphon-type method for removing sludge from a water or liquid waste settling tank is disclosed. A siphon conduit, through which liquid flows from the settling tank into an adjacent chamber which contains liquid at a level lower than the le... | 06/13/1978 |
