Vaginal ring
Patent 4155991 Issued on May 22, 1979. Estimated Expiration Date: 
March 3, 1997. 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.
March 3, 1997. 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 3527210 3545439 3659597 3744489 3908646 3911911 3920805 Vaginal ring Drug excipient of silicone rubber Intrauterine contraceptive device InventorsAssigneeApplicationNo. 05/774170 filed on 03/03/1977US Classes:424/432, IUD or ring128/832With contraceptive, spermacidal, or antifertility agentExaminersPrimary: Rose, Shep K.Attorney, Agent or FirmInternational ClassesA61K 9/00 (20060101)A61F 6/08 (20060101) A61F 6/00 (20060101) A61M 31/00 (20060101) Foreign Application Priority Data1974-10-18 DEAbstractA composite vaginal ring containing a safe and effective amount of a pharmaceutically active medicament, which comprises:(a) a major supporting vaginal ring consisting essentially of a physiologically acceptable synthetic resin and having at least a portion of the annular surface thereof adapted to mate with corresponding minor, medicament-containing vaginal ring segment; and(b) at least one minor, medicament-containing vaginal ring segment adapted to mate with the modified annular surface of said major supporting vaginal ring and consisting essentially of a safe and effective amount of a pharmaceutically active amount of a nonionic, lipophilic drug dissolved or uniformly suspended in an elastomeric, cross-linked LTV linear dimethylpolysiloxane resin.Other References
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