The Matthews Firm has sued Laminack, Pirtle & Martines and two clients they jointly represented, alleging Laminack, Pirtle and the clients refused to recognize The Matthews Firm’s interest in a contingent fee arising from a nearly $50 million judgment.

The plaintiff, a Houston firm that handles intellectual property work, brings breach of contract and quantum meruit causes of action against the defendants and seeks a declaratory judgment that it is entitled to a 22.5 percent fee in the underlying case.