Patent 7857719 was granted and assigned to Easton Sports on December, 2010 by the United States Patent and Trademark Office.
A composite ball bat includes an exposed region of transparent or translucent material, which provides a visual indication of whether delamination has occurred in the ball bat. As a result, an observer can determine, via visual inspection, whether delamination has occurred, and, if it has, can remove the bat from regulated play.