Polymer-treated ion exchange resins
Patent 4859462 Issued on August 22, 1989. Estimated Expiration Date: 
May 4, 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.
May 4, 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 ReferencesIron-resin adsorbate Prolonged release pharmaceutical preparations Patent #: 4221778 InventorsAssigneeApplicationNo. 07/046379 filed on 05/04/1987US Classes:424/78.1, Ion exchange resin424/496Containing natural gums/resinsExaminersPrimary: Ore, Dale R.Attorney, Agent or FirmInternational ClassesA61K 9/16 (20060101)A61K 47/48 (20060101) A61K 9/50 (20060101) AbstractSulfonic acid cationic exchange resin particles which have been treated to improve their coatability with minor amounts of high molecular weight polymers selected from carboxypolymethylene, xanthan gum, and propylene glycol alginate.Other References
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