The battle between the brewers began when Anheuser-Busch InBev suggested in ads during this year's Super Bowl that corn syrup was used to make Miller Lite and Coors Lite.
The new legal filing, which is heavily edited, claims that an employee of the Budweiser Brewer sent information including the recipes for Bud Light and Michelob Ultra to an employee of Miller Coors around the Super Bowl.
Miller Coor's employee had previously worked for AB InBev. He allegedly received the calls via text messages and said he had been asked by Miller Coor's top management to provide information on Bud Light, the legal complaint says.
According to court documents, the Budweiser employee printed screenshots of the recipes, folded them up and removed them from the brewery. The employee then sent photographs of recipes to Miller Coors employee.
Anheuser-Busch InBev explains in court documents that its recipes contain specific blends of hops and barley, as well as the weight and volume of the ingredients. It describes the information as "extremely valuable" to competitors.
The brewery in Budweiser asks for the return of its business secrets and punitive damages against Miller Coors.
"Miller Coors respects confidential information and takes all opposing allegations seriously, but if the ingredients are a secret, why did they spend tens of millions of dollars for to tell the whole world what's in Bud Light? "Adam Collins, a spokesman for Miller Coors, said in a statement. "And why are the ingredients printed on Bud Light's packaging in giant letters?"
"Anheuser-Busch has lost three major federal decisions in this case and now they are simply trying to distract the basic fact that they were intentionally misleading American consumers," he added.
Representatives of Anheuser-Busch InBev did not immediately respond to Friday asking for further information.