Method for preparing preparations having controlled release of an active component
Patent 4289795 Issued on September 15, 1981. Estimated Expiration Date: 
February 21, 1999. 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.
February 21, 1999. 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 2928770 3383283 InventorsAssigneeApplicationNo. 06/013124 filed on 02/21/1979US Classes:427/2.21, Retarded or controlled-release layer produced (e.g., enteric)424/471Plural concentric coresExaminersPrimary: Silverberg, SamAttorney, Agent or FirmInternational ClassA61K 9/50 (20060101)Foreign Application Priority Data1975-11-17 SEAbstractA method of preparing a preparation made up by bodies comprising an active component in decreasing concentration towards the surface of the bodies. The method comprises coating a particle with a composition comprising the active component in a continuous coating operation whereby the concentration of the active component is decreased. The active component may be a drug, a pesticide or an agent having some other effect. | |
