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Serving hundreds of leading biopharmaceutical companies globally:

Cerilliant
Chinese Patent Office
Julphar
Covington
McKinsey
Mallinckrodt
US Army
Fuji
Cipla

Generated: April 20, 2018

DrugPatentWatch Database Preview

Details for Patent: 8,158,781

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Which drugs does patent 8,158,781 protect, and when does it expire?

Patent 8,158,781 protects XIFAXAN and is included in two NDAs.

This patent has eighty-one patent family members in thirty-five countries.
Summary for Patent: 8,158,781
Title:Polymorphic forms .alpha., .beta. and .gamma. of rifaximin
Abstract: Crystalline polymorphous forms of rifaximin (INN) antibiotic named rifaximin .alpha. and rifaximin .beta., and a poorly crystalline form named rifaximin .gamma., useful in the production of medicinal preparations containing rifaximin for oral and topical use and obtained by means of a crystallization carried out by hot-dissolving the raw rifaximin in ethyl alcohol and by causing the crystallization of the product by addition of water at a determinate temperature and for a determinate period of time, followed by a drying carried out under controlled conditions until reaching a settled water content in the end product, are the object of the invention.
Inventor(s): Viscomi; Giuseppe Claudio (Bologna, IT), Campana; Manuela (Bologna, IT), Braga; Dario (Bologna, IT), Confortini; Donatella (Bologna, IT), Cannata; Vincenzo (Bologna, IT), Righi; Paolo (Bologna, IT), Rosini; Goffredo (Bologna, IT)
Assignee: Alfa Wassermann, S.p.A. (Bologna, IT)
Application Number:13/041,332
Patent Claim Types:
see list of patent claims

Drugs Protected by US Patent 8,158,781

Applicant Tradename Generic Name Dosage NDA Approval Date TE Type RLD RS Patent No. Patent Expiration Product Substance Delist Req. Patented / Exclusive Use Patent Submitted
Salix Pharms XIFAXAN rifaximin TABLET;ORAL 021361-001 May 25, 2004 RX Yes Yes ➤ Sign Up ➤ Sign Up Y ➤ Sign Up
Salix Pharms XIFAXAN rifaximin TABLET;ORAL 022554-001 Mar 24, 2010 RX Yes Yes ➤ Sign Up ➤ Sign Up Y ➤ Sign Up
Applicant Tradename Generic Name Dosage NDA Approval Date TE Type RLD RS Patent No. Patent Expiration Product Substance Delist Req. Patented / Exclusive Use Patent Submitted

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Foreign Priority and PCT Information for Patent: 8,158,781

Foriegn Application Priority Data
Foreign Country Foreign Patent Number Foreign Patent Date
ItalyMI2003A2144Nov 07, 2003

Non-Orange Book US Patents Family Members for Patent 8,158,781

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
7,902,206 Polymorphic forms .alpha., .beta. and .gamma. of rifaximin ➤ Sign Up
7,906,542 Pharmaceutical compositions comprising polymorphic forms .alpha., .beta., and .gamma. of rifaximin ➤ Sign Up
7,915,275 Use of polymorphic forms of rifaximin for medical preparations ➤ Sign Up
7,045,620 Polymorphous forms of rifaximin, processes for their production and use thereof in medicinal preparations ➤ Sign Up
Patent No. Title Estimated Patent Expiration

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Serving hundreds of leading biopharmaceutical companies globally:

Fuji
Mallinckrodt
McKesson
Merck
Dow
Moodys
Daiichi Sankyo
Chinese Patent Office
Johnson and Johnson

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