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Details for Patent: 5,955,109

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Patent 5,955,109 protects RETIN-A MICRO and RETIN-A-MICRO and is included in one NDA. There have been two Paragraph IV challenges on Retin-A Micro.

This patent has nineteen patent family members in nine countries.

Summary for Patent: 5,955,109

Title: Methods and compositions for topical delivery of retinoic acid
Abstract:Retinoic acid compositions intended for topical application are incorporated in novel formulations in which they are retained as impregnants inside the pores of porous solid particles or microspheres. The pores form a continuous network open to the exterior of the particles, permitting outward diffusion of the retinoic acid impregnant at a controlled rate depending on the pore size. The impregnated particles are prepared by impregnation of preformed particles with the retinoic acid.
Inventor(s): Won; Richard (Palo Alto, CA), Katz; Martin A. (Menlo Park, CA), Cheng; Chung H. (San Jose, CA), Nacht; Sergio (Los Altos, CA)
Assignee: Advanced Polymer Systems, Inc. (Redwood City, CA)
Application Number:08/079,220
Patent Claim Types:
see list of patent claims
Composition; Delivery; Use;

Applicant Tradename Generic Name Dosage NDA Approval Date Type RLD Patent No. Patent Expiration Product Substance Delist Req. Patented / Exclusive Use
Valeant Intl
RETIN-A MICRO
tretinoin
GEL;TOPICAL020475-002May 10, 2002RXYes5,955,109► subscribe TREATMENT OF ACNE VULGARIS
Valeant Intl
RETIN-A MICRO
tretinoin
GEL;TOPICAL020475-001Feb 7, 1997RXYes5,955,109► subscribeY TREATMENT OF ACNE VULGARIS
Valeant Intl
RETIN-A-MICRO
tretinoin
GEL;TOPICAL020475-003Jan 28, 2014RXYes5,955,109► subscribeY TREATMENT OF ACNE VULGARIS
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Non-Orange Book Patents for Patent: 5,955,109

For Orange Book-listed patents (shown in the main table above) generic applications must certify that the listed patents are expired, invalid, or will not be infringed by generic entry.

The non-Orange Book patents listed below do not require formal certifications, so they do not automatically impede generic entry. Instead, they represent potential opportunities for branded firms to block generic entry through patent infringment challenges.

Patent No. Title Estimated Patent Expiration
5,879,716 Methods and compositions for topical delivery of benzoyl peroxide► subscribe
5,145,675 Two step method for preparation of controlled release formulations► subscribe
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The estimated expiration dates shown above are derived by simply adding 20 years to the priority date.
Because of the complexity of determining patent expiration dates it is advisable to have patent counsel verify freedom to operate.

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International Patent Family for Patent: 5,955,109

Country Document Number Estimated Expiration Supplementary Protection Certificate SPC Country SPC Expiration
Austria106235► subscribe
Australia2164088► subscribe
Australia603379► 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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