On March 8, 2019, the U.S. Court of Appeals for the Federal Circuit reversed a March 2015 final written decision by the Patent Trial and Appeal Board (PTAB) in an inter partes review (IPR) proceeding that found several claims of PersonalWeb Technologies’ ‘310 patent to be unpatentable as obvious based on two prior art references.
The case began in September 2013, when Apple filed a petition requesting an IPR of six claims regarding the ‘310 patent, which is directed toward a method for utilizing a content-based identifier to determine whether a particular data item is present on a system.