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Merck Answers USPTO In Singulair Patent Re-Exam

By Leigh Kamping-Carder ( November 10, 2009, 3:56 PM EST) -- Merck & Co. has responded to an early finding from the U.S. Patent and Trademark Office that its patent covering blockbuster asthma and allergy drug Singulair is invalid, although it may be too late to affect the pharmaceutical giant's ongoing feud with generics maker Teva Pharmaceutical Industries Ltd....

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