BUFFALO, N.Y. — Lawyers for Facebook are expected in federal court in Buffalo, where a New York man has filed a lawsuit claiming part ownership of the social network site.

Paul Ceglia of Wellsville is suing Facebook based on a 2003 contract he says he signed with Facebook founder Mark Zuckerberg. Ceglia claims the contract to develop software and a website that eventually became Facebook entitles him to 84 percent ownership.

Facebook’s attorneys, in court filings, question why Ceglia waited seven years to come forward. They call his claim “outlandish.”

A state Supreme Court justice earlier this month signed a temporary restraining order preventing Facebook from transferring assets. The case has since moved to federal court, where Facebook will argue against the order Tuesday.