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How Many Patents Does It Take To Make A Drug - Follow-On Pharmaceutical Patents And University Licensing, Lisa Larrimore Ouellette

Michigan Telecommunications & Technology Law Review

As described by Professors Dan Burk and Mark Lemley, drugs are[...] special because of the low number of patents per product: "In some industries, such as chemistry and pharmaceuticals, a single patent normally covers a single product. Much conventional wisdom in the patent system is built on the unstated assumption of such a one-to-one correspondence." Although many have repeated this one-patent, one-drug assumption, there has been little empirical analysis of how many patents actually protect each drug. In fact, most small-molecule drugs are protected by multiple patents. The average was nearly 3.5 patents per drug in 2005, with over five …