Polymers for controlling soda ash crystal formation
Patent 4374102 Issued on February 15, 1983. Estimated Expiration Date: 
November 13, 2001. 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.
November 13, 2001. 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 3037849 3233983 3288770 3663461 3711573 3796794 3915904 Clarifier process for producing sodium carbonate Process for crystallization of anhydrous sodium carbonate Patent #: 4183901 InventorsApplicationNo. 06/321288 filed on 11/13/1981US Classes:423/206.2, Alkali carbonate from trona23/302T, Sodium compounds423/266, For stabilizing crystal size or shape423/421Alkali metal containing (Li, Na, K, Rb, or Cs)ExaminersPrimary: Straub, Gary P.Attorney, Agent or FirmInternational ClassC01D 7/00 (20060101)AbstractPoly N,N-dimethylaminomethyl acrylamide, when added to clarified trona solutions, improves the crystals subsequently formed from these solutions. Preferably, the poly N,N,-dimethylamino methyl acrylamide crystal modifier is used in conjunction with a water-soluble cationically charged coagulant. |
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