Osmotic device with hydrogel driving member
Patent 4327725 Issued on May 4, 1982. Estimated Expiration Date: 
November 25, 2000. 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 25, 2000. 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 ReferencesOsmotic system for delivering selected beneficial agents having varying degrees of solubility Osmotic system for the controlled and delivery of agent over time Osmotic system with means for improving delivery kinetics of system Osmotic system with volume amplifier for increasing amount of agent delivered therefrom Device having variable volume chamber for dispensing useful agent Patent #: 4203440 InventorsAssigneeApplicationNo. 06/210176 filed on 11/25/1980US Classes:424/427, Ocular424/431, Tampon424/473, With porous, perforated, apertured, or sieved layer (e.g., dialyzing layer, microporous layer, etc.)604/515, To or from the female reproductory tract604/57, Means for placing solid treating material in body604/904TAMPONSExaminersPrimary: Rosenbaum, C. FredAttorney, Agent or FirmInternational ClassA61K 9/00 (20060101)AbstractAn osmotic device is disclosed comprising a semipermeable wall surrounding a compartment housing an agent that is insoluble to very soluble in aqueous and biological fluids, and a layer of a fluid swellable, hydrogel. A passageway in the wall connects the agent with the exterior of the device. | |
