A lawyer who signed a noncompete agreement with his former firm cannot claim damages on the grounds that the agreement is barred by New York state disciplinary rules, a Manhattan federal judge has ruled.

In 2001, New York’s Rosenman & Colin acquired the practice of small intellectual property firm Helfgott & Karas, naming one of the latter’s founders, Aaron B. Karas, to the position of counsel. Rosenman & Colin itself merged the following year with Chicago’s Katten Muchin Zavis, forming the firm now known as Katten Muchin Rosenman.