Pfizer, AstraZeneca file patent suits against Hetero Drugs

Multinational drug majors Pfizer and AstraZeneca have filed separate patent infringement cases against city-based Pharma Company Hetero Drugs in two different US courts. While Pfizer dragged Hetero to court for violating patents of its blockbuster drug Viagra, which is used for the treatment of impotence, AstraZeneca filed a patent infringement suit seeking an order restraining the generic drug maker from launching a generic version...