Beijing Court Hears Wrangle on Viagra Patent

The legal battle over the legitimacy of the patent rights for impotency drug Viagra recently began at a Beijing court. Drugmaker Pfizer is suing China's Patent Re-examination Board (PRB) of the State Intellectual Property Office for wrongfully invalidating its China patent over the use of sildenafil, the active ingredient in Viagra, a drug taken by patients suffering male erectile dysfunction (MED).

China Daily (http://www.chinadaily.com.cn/english/doc/2005-03/31/content_429704.htm)