A federal judge upheld a U.S. patent for Pfizer Inc.'s (PFE) blockbuster anti-impotence pill Viagra, preserving Pfizer's market exclusivity on the drug into 2019.
U.S. Judge Rebecca Beach Smith in federal court in Norfolk, Va., ruled Friday that Teva Pharmaceutical Industries Ltd.'s (TEVA, TEVA.TV) proposed generic version of Viagra would infringe a Pfizer patent for the drug, and that the patent is valid and enforceable.
The 2019 patent covers the use of Viagra's active ingredient, sildenafil, to treat erectile dysfunction. An earlier patent, covering the basic compound, is due to expire next year; Teva didn't ...
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