Vacuum filter assembly
Patent 5141639 Issued on August 25, 1992. Estimated Expiration Date: 
July 19, 2011. 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.
July 19, 2011. 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 2879207 Filter-degasser Frangible bonded disposable filtration unit with recoverable filter Bottle top filter Patent #: 4673501 InventorsApplicationNo. 732966 filed on 07/19/1991US Classes:210/321.75, Planar membrane210/321.84, Planar membrane210/406, Vacuumized filtrate receiver210/416.1, With pump, gas pressure, or suction source210/455, Receptacle and modified spacing surface or support for filter medium422/99, Miscellaneous laboratory apparatus and elements, per se422/101, Including means for separating a constituent; e.g., filter, condenser, extractor, etc.604/406Filter or series thereof for liquid entering or leaving containerExaminersPrimary: Dawson, Robert A.Assistant: Fortuna, Ana Attorney, Agent or FirmInternational ClassB01D 063/00AbstractA vacuum filter assembly for filtering a feed liquid includes a filter membrane held in a cover attachable to the filtrate container. The cover is formed with a feed liquid nipple on one side of the filter membrane, a filtrate outlet tube on the other side of the filter body, and a vacuum port. A portion of the surface of the membrane is non-wettable by the feed liquid to facilitate restarting the filtration if the filtration is interrupted. Also, the vacuum port includes a vacuum tube covered at its end by another membrane having pores permeable by air but not by the feed liquid, for fixing the maximum level of the filtrate within the filtrate container.Field of SearchWith pump, gas pressure, or suction sourceWith pump, gas pressure or vacuum source Including a filter Planar membrane Planar membrane Vacuumized filtrate receiver Clamped in casing joint Receptacle and modified spacing surface or support for filter medium Filter or series thereof for liquid entering or leaving container Miscellaneous laboratory apparatus and elements, per se Including means for separating a constituent; e.g., filter, condenser, extractor, etc. | |
