There are slides devoted to this topic: Lecture 7b, 20-31.
Enter the world of “The Trial” to read all about the the Honeywell-Sperry suit – the detailed account includes background of the case, Atansoff and Mauchly’s testimonies, and the final verdict. This page is maintained by a group at the Iowa State University dedicated to reproducing the ABC computer.
This five-minute film attempts to answer the question of who invented the computer–and concludes that no single person did. An excellent overview of the competing “firsts,” it ends with Honeywell v. Sperry Rand.