A patent claim chart is commonly used in U.S. Patent infringement litigation and can be in tabular (for evidence of use) or graphical formats. The claim chart is basically a visualization of all of the information analyzed in a patent claim. The purpose of a claim chart is to determine if there is any infringement activity.
There are many different use cases for claim charts. Simply put, a claim chart is a tabular or graphical presentation that breaks a patent claim into its constituent elements, or limitations. For each element, evidences of use or prior art is presented. The goal of a claim chart is to systematically present the mapping between each claim limitation and the evidences of use, prior art, intent, etc.