Unknown to James Morgan and the senior management of Atari, Warner had been in talks with Tramel Technology to buy Atari's consumer electronics and home computer divisions. Negotiating until close to midnight on July 1, 1984, Jack Tramiel purchased Atari. Warner sold the home computing and game console divisions of Atari to Tramiel for $50 cash and $240 million in promissory notes and stocks, giving Warner a 20% stake in Atari Corporation.
On July 2, 1984, American entrepreneur Bill Masters filed a patent for his Computer Automated Manufacturing Process and System (US 4665492).
Maradona transferred to Napoli in Italy's Serie A for another world record fee, £6.9 million ($10.48M). Maradona arrived in Naples and was presented to the world media as a Napoli player on 5 July 1984, where he was welcomed by 75,000 fans at his presentation at the Stadio San Paolo.
On 16 July 1984, Alain Le Méhauté, Olivier de Witte, and Jean Claude André filed their patent for the stereolithography process. The application of the French inventors was abandoned by the French General Electric Company (now Alcatel-Alsthom) and CILAS (The Laser Consortium).
The San Ysidro McDonald's massacre was an act of mass murder which occurred at a McDonald's restaurant in the San Ysidro neighborhood of San Diego, California on July 18, 1984. The perpetrator, 41-year-old James Huberty, fatally shot 21 people and wounded 19 others before being killed by a police sniper approximately 77 minutes after he had first opened fire. The San Ysidro McDonald's massacre was considered the worst mass shooting in the United States (in terms of number of fatalities) until 1991, and remains the eighth deadliest mass shooting in American history