Active agent dispenser
Patent 4564364 Issued on January 14, 1986. Estimated Expiration Date: 
May 26, 2003. 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 26, 2003. 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 3342183 3598127 3854480 3921636 3923939 3926188 Novel drug delivery device Microporous drug delivery device Antimicrobial sutures Bandage for transdermally administering scopolamine to prevent nausea InventorsAssigneeApplicationNo. 06/498381 filed on 05/26/1983US Classes:424/484, Matrices424/449, Transdermal or percutaneous604/304, Bandage, pad, or shield placed on body for sustained treatment thereof604/307, Adhesively attachable to body604/308Bandage, pad, shield, or attaching means extendable around body portionExaminersPrimary: Williams, Howard L.Attorney, Agent or FirmInternational ClassesA61K 9/20 (20060101)A61K 9/70 (20060101) A61M 31/00 (20060101) AbstractThe release pattern of a dispersion type active agent dispenser can be improved by forming the device from a depleted zone containing the agent at a concentration no greater than the saturation and a non-depleted zone containing the agent dispersed in the matrix at a uniform concentration greater than saturation. The depleted zone is disposed between the surface through which the agent is to be dispensed and at least a substantial portion of the non-depleted zone with the interface therebetween disposed at a non-uniform distance from the releasing surface. Certain embodiments are particularly useful for the transdermal administration of drugs.Other References
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