Method of transdermal drug delivery
Patent 4834978 Issued on May 30, 1989. Estimated Expiration Date: 
February 8, 2008. 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.
February 8, 2008. 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 ReferencesMethod of transdermal drug delivery Patent #: 4624665 InventorApplicationNo. 07/153147 filed on 02/08/1988US Classes:424/448, Pressure sensitive adhesive means424/423, Surgical implant or material424/449Transdermal or percutaneousExaminersPrimary: Page, Thurman K.Assistant: Prater, P. L. Attorney, Agent or FirmInternational ClassA61K 9/70 (20060101)AbstractA transdermal drug delivery system useful for the controlled, for example, zero order, release of one or more drugs to a selected skin area of a user, which system comprises a reservoir containing a transdermal delivery composition. The reservoir contains a composition which comprises a base material, which is a solid but which melts or liquefies upon contact with the skin of a user and selected to occlude the skin of the user to force hydration of the stratum corneum with water from the lower layers of the epidermis of the user and a plurality of solid microparticles, generally uniformly dispersed and suspended in the base material, the microparticles containing an effective, therapeutic amount of the drug for transdermal delivery, such as the contraceptive steroid. In use, the base material forms a thermodynamically stable thin film layer in intimate contact with the skin while the drug is released from the microparticles into the base material and transdermally into the user through the thin liquid film of the base material. | |
