Reuters and Bloomberg reported earlier this week on an ongoing patent battle (read: pissing match) between Pfizer and Eli Lilly & Co. relating to their erectile dysfunction drugs Viagra and Cialis, respectively.
A US Patent and Trademark Office (USPTO) appeals committee has ruled that an element of Pfizer's patent on sildenafil, the active chemical in Viagra, is invalid because the drug is insufficiently different from a traditional Chinese medicine called Yin Yang Huo or horny goat weed.
At issue is Pfizer's claim to a method for treating male erectile dysfunction. The patent appeals…
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