Production of paper and paperboard
Patent 4753710 Issued on June 28, 1988. Estimated Expiration Date: 
January 27, 2007. 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 27, 2007. 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 2368635 3052595 3433704 Production of newprint, kraft or fluting medium Papermaking and products made thereby Patent #: 4388150 InventorsApplicationNo. 07/006953 filed on 01/27/1987US Classes:162/164.3, Epoxy containing reactant162/164.6, Nitrogen containing162/168.2, Nitrogen containing compound162/168.3, Acrylamide containing162/181.3, Sulfate or sulfite162/181.8ClayExaminersPrimary: Chin, PeterAttorney, Agent or FirmInternational ClassesD21H 17/45 (20060101)D21H 17/68 (20060101) D21H 17/00 (20060101) D21H 17/56 (20060101) D21H 23/00 (20060101) D21H 23/14 (20060101) D21H 17/55 (20060101) D21H 21/10 (20060101) Foreign Application Priority Data1986-01-29 GBAbstractPaper or paper board is made by passing an aqueous cellulosic suspension through a centriscreen or other shear device and then draining the purified suspension, and an improved combination of retention, drainage, drying and formation is achieved by adding to the suspension an excess of high molecular weight linear synthetic cationic polymer before shearing the suspension and adding bentonite after shearing.Other References
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