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Generated: December 13, 2017

DrugPatentWatch Database Preview

Details for Patent: 4,559,222

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Summary for Patent: 4,559,222

Title: Matrix composition for transdermal therapeutic system
Abstract:Mineral oil (MO) polyisobutylene (PIB), colloidal silicon dioxide (CSD) mixtures suitable for use as drug containing matrices in transdermal delivery systems are disclosed. Preferred systems for dispensing moderately mineral oil soluble drugs contain at least about 6% CSD, have a MO/PIB of at least 1.0 and a viscosity of at least 1.5.times.10.sup.7 poises. Preferred systems for dispensing clonidine have a clonidine permeability of at least 1.0.times.10.sup.-4 .mu.g/cm sec and a MO/PIB of at least 1.2.
Inventor(s): Enscore; David J. (Mountain View, CA), Gale; Robert M. (Mountain View, CA)
Assignee: ALZA Corporation (Palo Alto, CA)
Application Number:06/491,490
Patent Claim Types:
see list of patent claims
Composition; Delivery;

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International Patent Family for Patent: 4,559,222

Country Document Number Estimated Expiration Supplementary Protection Certificate SPC Country SPC Expiration
Australia2717184► Subscribe
Australia558304► Subscribe
Belgium899444► Subscribe
Canada1217139► Subscribe
Switzerland666190► Subscribe
Germany3416248► Subscribe
Spain532228► Subscribe
Spain8600943► Subscribe
France2545357► Subscribe
United Kingdom2140019► 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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Serving leading biopharmaceutical companies globally:

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