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Details for Patent: 5,721,275

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Summary for Patent: 5,721,275

Title: Slow release vehicles for minimizing skin irritancy of topical compositions
Abstract:Staple, aqueous gel vehicles are provided for the topical application to the skin of irritating active ingredients such as retinoids, particularly tretinoin, with slow release of the active ingredient and minimal irritancy to the skin. The vehicles include a gelling agent effective to form a gel and hold the active ingredient in the aqueous medium for slow release on the skin, and an effective amount of an antioxidant to retard decomposition of the active ingredient. The vehicles and formulations are preferably aqueous emulsions which contain a solubilizing agent for the generally non-water soluble active ingredients, as well as usually an emulsifying agent and/or surfactant. Chelating agents, emollients, preservatives and other adjuvants and additives may also be included in the vehicles and formulations.
Inventor(s): Bazzano; Gail S. (Metairie, LA)
Assignee:
Application Number:07/856,157
Patent Claim Types:
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Composition; Use;

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Foreign Priority and PCT Information for Patent: 5,721,275

PCT Information
PCT FiledJune 07, 1990PCT Application Number:PCT/US90/03219
PCT Publication Date:December 13, 1990PCT Publication Number: WO90/14833

International Patent Family for Patent: 5,721,275

Country Document Number Estimated Expiration Supplementary Protection Certificate SPC Country SPC Expiration
Canada2063576► subscribe
Germany69029804► subscribe
European Patent Office0481007► 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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