R. McGinnis and N. C. Perkins, “Ball Joint Center Locating Method Using Data from Attached Inertial Measurement Unit” US Patent, issued January 12, 2018, Serial No. 14/423,852

R. McGinnis and N. C. Perkins, “Pitcher training apparatus and method using a ball with an embedded inertial measurement unit,” US Patent No. 9,032,794, issued May 19, 2015.

N. C. Perkins, K. King, R. Doss, “Apparatus and method for identifying and analyzing the free flight dynamics of a rigid body,” US Patent No. 9,140,717 issued September 22, 2015.

N. C. Perkins, R. McGinnis, “Athlete speed prediction method using data from attached inertial measurement unit,” US Patent No. 9,213,889, issued December 15, 2015.

N. C. Perkins, “Electronic measurement of the motion of a moving body of sports equipment,” US Patent No. 7,234,351, issued June 26, 2007. (continuation of US Patent 7,021,140).

N. C. Perkins, “Electronic measurement of the motion of a moving body of sports equipment”, US Patent No. 7,021,140, issued April 4, 2006.