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Ranbaxy, Samsung, Zillow, Scotch: Intellectual Property

A gap in U.S. patent law has kept cheap copies of Novartis AG’s heart drug Diovan off the market for 18 months, costing U.S. consumers and insurers as much as $900 million in potential savings.

While the Diovan patent expired in September 2012, the only company allowed to sell copies, Ranbaxy Laboratories Ltd., hasn’t been able to manufacture and market them after four factories it runs in India failed U.S. inspections.