Drug delivery device
Patent 3967618 Issued on July 6, 1976. Estimated Expiration Date: 
July 6, 1993. 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.
July 6, 1993. 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 3279996 3705938 3710795 3896819 InventorApplicationNo. 555840 filed on 03/06/1975US Classes:128/833, Intrauterine424/424, Membrane or diffusion barrier424/432, IUD or ring424/435, Mouth604/515, To or from the female reproductory tract604/57Means for placing solid treating material in bodyExaminersPrimary: Medbery, Aldrich F.Attorney, Agent or FirmAbstractA drug delivery device for administering a drug at a controlled rate for a prolonged period of time to produce a local or systemic physiological or pharmacological effect is comprised of a wall surrounding a reservoir containing a drug. The reservoir is formed of a drug carrier permeable to the passage of the drug and in which the drug has limited solubility. The wall is formed in at least a part of a drug release rate controlling material also permeable to the passage of the drug, but the rate of passage of the drug through the wall is lower than the rate passage of the drug through the drug carrier so that drug release by the wall is the drug release rate controlling step for releasing drug from the drug delivery device.Other References
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