Pfizer wins Viagra patent, moves to block competition
Pfizer Inc. received a broad U.S. patent covering the way Viagra works to treat impotence and immediately filed two lawsuits to block rivals from selling competing products relying on the same
Pfizer Inc. received a broad U.S. patent covering the way Viagra works to treat impotence and immediately filed two lawsuits to block rivals from selling competing products relying on the same