Diffusion matrix for transdermal drug administration and transdermal drug delivery devices including same
Patent 4911916 Issued on March 27, 1990. Estimated Expiration Date: 
April 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.
April 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 References 3426754 3486968 3645835 3685734 3699963 3849238 Therapeutic system for administering drugs to the skin Skin barrier Dosage for coadministering drug and percutaneous absorption enhancer Polymeric diffusion matrix containing estrogens InventorAssigneeApplicationNo. 179561 filed on 04/08/1988US Classes:424/449, Transdermal or percutaneous424/447, Bandages with incorporated medicaments424/448Pressure sensitive adhesive meansExaminersPrimary: Page, Thurman K.Assistant: Prater, P. L. Attorney, Agent or FirmForeign Patent References
International ClassA61F 013/00Foreign Application Priority Data1987-12-14 AUAbstractA solid state, resilient laminated composite for administering a drug transdermally consisting of a top layer of a resilient elastomer; a middle diffusion matrix layer composed of a polyurethane macroporous foam framework in whose pores are embedded a viscoelastic blend of a medical grade polysiloxane adhesive, drug, and optionally a percutaneous absorption enhancer, and a basal surface layer of the medical grade polysiloxane adhesive.Other References
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