Key Finding: This chart also categorizes pharmaceutical claims into four groups: compound, composition (which includes formulation), method of treatment, and process of preparing. However, this chart evaluates unpatentability/cancellation rates relative to claims instituted. Interestingly, unlike the results for claims challenged, compound claims fare worst post institution. Again, note that the sample size for compound claims is still small (142 claims). These statistics do not account for redundancies (which were deemed immaterial). Again, the claims were categorized based on the class as claimed, rather than attempting to determine a likely key claim feature in the body of the claim.