System with microporous reservoir having surface for diffusional delivery of agent
Patent 4217898 Issued on August 19, 1980. Estimated Expiration Date: 
October 23, 1998. 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.
October 23, 1998. 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 2478182 2846057 2928770 2987445 3146169 3538214 Novel drug permeable wall Novel drug delivery device Osmotic device having microporous reservoir Patent #: 3977404 InventorApplicationNo. 05/953907 filed on 10/23/1978US Classes:424/433, Depot, pellet, matrix, or suppository424/427, Ocular424/436, Anal, rectal (e.g., suppositories, etc.)424/473, With porous, perforated, apertured, or sieved layer (e.g., dialyzing layer, microporous layer, etc.)424/486Synthetic polymerExaminersPrimary: Rosenbaum, C. FredAttorney, Agent or FirmInternational ClassesA61K 9/00 (20060101)A61M 31/00 (20060101) AbstractA system is disclosed for delivering an active agent to a fluid environment of use. The system comprises a microporous reservoir, an active agent housed in the reservoir, a surface that defines an exposed area of the reservoir for releasing agent from the reservoir to the environment, and a wall impermeable to both fluid and agent that surrounds the remaining, unexposed surfaces of the reservoir. In operation, when the system is in the environment with the exposed surface presented to fluid, fluid enters the system through the exposed surface causing agent to diffuse from within the system, which agent is released from the exposed surface of the system to the environment at a controlled rate over time.Other References
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