In Pictures: ENIAC, world's first digital computer...
According to a document from the University of Pennsylvania, patent issues became a problem. The university had a policy barring faculty from obtaining private patents based on university research. But the ENIAC was supported through military funding. After World War II the military wanted academic institutions seeking research contracts to have uniform patent policies, so the university demanded that Mauchly and Eckert give their patent rights back. Having done the work of filing the patent, Mauchly and Eckert did not oblige. This decision ultimately led to their resignations in March 1946. Mauchly and Eckert ultimately formed the Electronic Controls Company in Philadelphia, and in 1950 sold their company to Remington Rand, which ultimately became part of Unisys.
In Pictures: ENIAC, world's first digital computer, turns 66