Water filter device
Patent 4025438 Issued on May 24, 1977. Estimated Expiration Date: 
May 24, 1994. 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 24, 1994. 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 966963 2328381 2773601 3266628 3327859 3357563 3529726 3585130 3746174 3799352 InventorsAssigneeApplicationNo. 05/548654 filed on 02/10/1975US Classes:210/484, Medium within foraminous supporting container or sheath210/449, Pipe end attached closed casing, e.g., faucet210/489, For series flow210/503Diverse granular or fibrousExaminersPrimary: Spear, Frank A. Jr.Assistant: Cintins, Ivars Attorney, Agent or FirmAbstractIn accordance with the invention there is provided a water filter and water filter cartridge having an upper water filtering layer containing charcoal particles, a lower filtering layer having a submicron pore size and an intermediate filtering layer having a pore size greater than that of the lower layer but less than the particle size of the charcoal in the upper layer.Field of SearchWith spaced non-particulate separating meansRemovable cartridge or hand-manipulated container Pervious divider between and contacting beds With multi-layer beds Imperforate central liquid tube Axially aligned inlet and outlet Pipe end attached closed casing, e.g., faucet Internal fixed shoulder supporting filter element Diverse granular or fibrous Receptacle and modified spacing surface or support for filter medium Single open-end-type filter element Single open-end-type filter element Including fibers Medium within foraminous supporting container or sheath Abutted or superimposed members For series flow Alternating dissimilar | |
