Device and a method for filtering a liquid with wood ash to remove impurities therefrom
Patent 5108614 Issued on April 28, 1992. Estimated Expiration Date: 
May 10, 2009. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
May 10, 2009. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.InventorsAssigneeApplicationNo. 350018 filed on 05/10/1989US Classes:210/665, By making an insoluble substance or accreting suspended constituents210/283, Pervious divider between and contacting beds210/669, Prior to ion exchange or sorption210/688, Heavy metal210/691, From aqueous material210/715, Utilizing sludge or floc blanket210/724, Regulating pH210/807, Utilizing particulate bed210/912, Heavy metal210/913ChromiumExaminersPrimary: Hruskoci, Peter A.Attorney, Agent or FirmForeign Patent References
International ClassC02F 001/28AbstractThe liquid from which impurities are to be removed is introduced by being distributed throughout the entire top or bottom surface of the filtering medium. The filtering medium includes at least a bed of wood ash through which the liquid is allowed to flow for removing at least part of its impurities to give a purified liquid. The liquid can flow through the filtering medium either by gravity, under pressure or can be forced upwardly through the filtering medium. This type of filtering medium has proved to be cheaper to build and used and is more efficient than those presently known.Other References
Field of SearchHeavy metalFrom aqueous material Utilizing activated carbon pH sensing Particulate bed Reverse flow Including addition of diverse fluid Utilizing particulate bed Selective units or compartments Pervious divider between and contacting beds Spaced beds With particular liquid receiving means or foraminous bed retainer Prior to ion exchange or sorption Heavy metal Chromium Mercury By making an insoluble substance or accreting suspended constituents Making an insoluble substance or accreting suspended constituents Utilizing sludge or floc blanket Regulating pH | |
