A former client has sued Greenberg Traurig, alleging the firm switched sides and used its knowledge of privileged intellectual property information from previous patent work to attempt to invalidate a patent for a new client’s benefit.

Apollo Enterprise Solutions Inc. filed suit May 5 against Greenberg Traurig and 20 other unnamed defendants in the Superior Court of California, County of Los Angeles, citing breach of duty, interference with contract and negligence. Apollo, represented by Kinsella Weitzman Iser Kump & Aldisert of Santa Monica, is demanding at least $2 million for punitive damages, interest and costs.