Pulpers for disintegrating cellulose pulp
Patent 5377918 Issued on January 3, 1995. Estimated Expiration Date: 
August 11, 2012. 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.
August 11, 2012. 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 2137388 2448038 3188942 Pulper Waste treatment system Patent #: 4884756 InventorsAssigneeApplicationNo. 928944 filed on 08/11/1992US Classes:241/46.17, By rotating impeller-type agitating means241/60Applied subsequently to comminutingExaminersPrimary: Jones, EugeniaAssistant: Schrock, Allan M. Attorney, Agent or FirmInternational ClassB02C 023/22Foreign Application Priority Data1991-08-13 ESAbstractA pulper for the disintegration of cellulose pulp is disclosed in which a vessel containing bales of waste paper or pulp is of a spiral shape with a flat bottom, and a rotor is located in the center of the spiral. Impurities and foreign bodies are driven towards an Archimedes screw located at the outlet from the spiral, which removes them to the exterior. In this final pass this is washed by spray nozzles to recover the carried-over pulp.Other References
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