Patents on New Uses for 'Old' Inventions: The Struggle in the Federal Circuit

While a chemical compound, such as a drug, cannot be patented twice based on the discovery of a new property of the compound (no matter how important), the patent statutes explicitly authorize patents on new uses for 'old compounds.' While such method-of-use claims can be difficult to enforce, they can be extremely valuable, both to society and to the patent owner. AZT, a failed anti-cancer drug, earned millions and extended lives, after Burroughs Wellcome patented its use to treat HIV/AIDs. While a patent on a new use of an old compound can seem unfair, nothing is taken from the public domain. The patent often only confers the right to prevent others from advertising that the drug can be used to treat condition X as well as its 'old use' to treat condition Y. The public remains free to use the 'old drug' for any unpatented purpose.

8 minute read February 01, 2007 at 09:08 AM

By

Warren D. Woessner, Ph.d.