The following is a summary of Southern California-related business litigation developments during the week of April 26:

Nike Files Trademark Infringement Suit: Nike Inc. filed three federal lawsuits Tuesday, claiming trademark infringement against Los Angeles retailers. The suits brought in U.S. District Court in Los Angeles claim that the defendants manufactured and sold T-shirts and other apparel with Nike’s trademarks, including its distinctive “swoosh” design. The action seeks unspecified damages plus $100 million in punitive damages from U.S. Sportswear, Young’s Silk Printing, and J.C. Designs. The defendants could not be reached for comment. (Filed April 3, 1990. Case Nos. 90-1664, 90-1665, 90-1666)