Process for time-controlled release of active ingredients
Patent 4608248 Issued on August 26, 1986. Estimated Expiration Date: 
February 24, 2006. 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 24, 2006. 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 ReferencesInventorsApplicationNo. 06/833430 filed on 02/24/1986US Classes:424/427OcularExaminersPrimary: Rose, Shep K.Attorney, Agent or FirmInternational ClassA61K 9/20 (20060101)AbstractThe present invention provides a process for the timed control of the liberation of active material from a retarded active material-containing composition by the addition of a hydrophilic polymer, wherein the rate of liberation is adjusted by means of the viscosity of the added hydrophilic polymer, the rate of liberation increasing with increasing viscosity.Other References
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