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Generated: April 28, 2017

DrugPatentWatch Database Preview

Details for Patent: 5,955,109

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Which drugs does patent 5,955,109 protect, and when does it expire?


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 TE Type RLD RS Patent No. Patent Expiration Product Substance Delist Req. Patented / Exclusive Use
Valeant Intl
RETIN-A MICRO
tretinoin
GEL;TOPICAL020475-002May 10, 2002ABRXYesYes5,955,109► Subscribe TREATMENT OF ACNE VULGARIS
Valeant Intl
RETIN-A MICRO
tretinoin
GEL;TOPICAL020475-001Feb 7, 1997ABRXYesYes5,955,109► SubscribeY TREATMENT OF ACNE VULGARIS
Valeant Intl
RETIN-A-MICRO
tretinoin
GEL;TOPICAL020475-003Jan 28, 2014RXYesYes5,955,109► 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
5,145,675 Two step method for preparation of controlled release formulations► Subscribe
5,879,716 Methods and compositions for topical delivery of benzoyl peroxide► 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
Australia2164088► Subscribe
European Patent Office0277211► Subscribe
Australia7858087► Subscribe
Canada1303991► Subscribe
Canada1310583► 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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Drugs may be covered by multiple patents or regulatory protections. All trademarks and applicant names are the property of their respective owners or licensors. Although great care is taken in the proper and correct provision of this service, thinkBiotech LLC does not accept any responsibility for possible consequences of errors or omissions in the provided data. The data presented herein is for information purposes only. There is no warranty that the data contained herein is error free. thinkBiotech performs no independent verifification of facts as provided by public sources nor are attempts made to provide legal or investing advice. Any reliance on data provided herein is done solely at the discretion of the user. Users of this service are advised to seek professional advice and independent confirmation before considering acting on any of the provided information. thinkBiotech LLC reserves the right to amend, extend or withdraw any part or all of the offered service without notice.

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