Institutional Success IndeX (ISIX) is a internally developed measurement of PTAB success by a law firm. The index permits anyone to easily measure how successful a law firm has historically been at being instituted and successfully invalidating at least 1 claim of a challenged patent. It measures any law firm with more than 50 institution decision to ensure there are enough results.
The formula is: (A) +1 point for any successful institution (excluding joinder), (B) -1 point for all non-institutions (on the merits), and (C) -2 points for all Final Written Decisions (FWD) in which all challenged claims are found patentable. The resulting score is divided by the total number of institution decisions of (A + B). Generally speaking, the higher the ISIX score for a petitioner counsel the more successful they have been. The lower the ISIX score for a patent owner counsel, the more successful they have been.