Device for delivery of useful agent
Patent 4014987 Issued on March 29, 1977. Estimated Expiration Date: 
March 29, 1994. 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 29, 1994. 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 3143472 3545439 3710795 3854480 InventorsApplicationNo. 05/591443 filed on 06/30/1975US Classes:424/432, IUD or ring128/832, With contraceptive, spermacidal, or antifertility agent424/486, Synthetic polymer504/204, Having -C(=X)X-, wherein the X is chalcogen, bonded directly to the nitrogen504/254, Chalcogen bonded directly to ring carbon of the six-membered hetero ring504/305, Benzene ring attached indirectly to the nitrogen by nonionic bonding504/323, Oxygen is bonded directly to the benzene ring and is part of an acyclic chain between the benzene ring and a -C(=O)O- group (e.g., 2,4-dichlorophenoxyacetic acids, etc.)604/515To or from the female reproductory tractExaminersPrimary: Rose, Shep K.Attorney, Agent or FirmInternational ClassA61K 9/00 (20060101)AbstractA device for the controlled continuous administration of an active agent to an environment of use is disclosed. The device comprises a body of erodible agent release rate controlling material containing an agent dispersed therethrough; the rate controlling material is a hydrophobic poly(carboxylic acid) having one ionizable carboxylic hydrogen for each 8 to 12 carbon atoms, which material erodes at a controlled and continuous rate over a prolonged period of time in response to the environment by a process of carboxylic hydrogen ionization, thereby releasing the dispersed agent at a controlled rate over a prolonged period of time. | |
