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Details for Patent: 4,814,168

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Summary for Patent: 4,814,168

Title: Transdermal multipolymer drug delivery system
Abstract:A dermal compositon comprising a drug, a multi-polymer of vinyl acetate, polyethylene and optionally one or more monomers, a natural or synthetic rubber and a tackifying agent. The ratio of the multipolymer to the rubber is, respectively, about 1:1 to about 10:1 and more preferably 1:1 to 5:1 and more preferably 3:1. The dermal composition can optionally contain a crosslinking agent, tackifiers, penetration enhancers and other ingredients known for use in adhesives for the transdermal delivery of drugs. The dermal compositions can be produced by a variety of methods known in the preparation of drug containing adhesive preparations including the homogenous mixing of the multi-polymer, drug and optional crosslinking agent and additional ingredients in aqueous solution followed by removal of excess water.
Inventor(s): Sablotsky; Steven (Miami, FL), Questel; John M. (Cuyahoga Falls, OH), Leeson; Dorothy J. (North Canton, OH)
Assignee: Noven Pharmaceuticals, Inc. (Miami, FL)
Application Number:07/164,482
Patent Claim Types:
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Composition;

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International Patent Family for Patent: 4,814,168

Country Document Number Estimated Expiration Supplementary Protection Certificate SPC Country SPC Expiration
Argentina002355► subscribe
Austria122240► subscribe
Austria144704► subscribe
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The estimated expiration dates shown above are derived by simply adding 20 years to the priority date.
Due to the complexity of determining patent expirations even in a single country, compounded by the diversity of global patent laws, it is advisable to have patent counsel verify freedom to operate.

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