Backwashing filter assembly
Patent 5437788 Issued on August 1, 1995. Estimated Expiration Date: 
January 10, 2014. 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.
January 10, 2014. 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.Patent References 2784846 3666097 Filter cleaning method and filter system Air/water distributor underdrain Filter with self-actuating rotating backwash selector Backwash method and apparatus Backwash method and apparatus Patent #: 5114596 InventorsApplicationNo. 179121 filed on 01/10/1994US Classes:210/333.01, Backwash or blowback210/323.2, Tubular210/411Backwash or blowbackExaminersPrimary: Hruskoci, Peter A.Attorney, Agent or FirmInternational ClassB01D 029/66AbstractA filter assembly includes a housing divided into a first chamber and a second chamber. A filter element is disposed in the first chamber, and a conduit is disposed in and opens to the second chamber. A weep hole introduces a backwash liquid from the second chamber into the filter element or the conduit. A differential pressure is then established between the opening in the conduit and the exterior of the filter element to force the backwash liquid through the filter element and thereby clean the filter element and/or strip a precoat layer from the filter element.Other References
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