A New Jersey biotechnology company is accusing a leading product-liability and toxic-tort lawyer, James Tyrrell Jr., of giving fraudulent and negligent advice that cost the client more than $10 million.

In the late 1990s, Tyrrell and his firm, Latham & Watkins in Newark, convinced Artegraft Inc. of North Brunswick to pursue Johnson & Johnson in a contract dispute using a patent theory that Tyrrell manufactured without legal foundation, a suit filed in Middlesex County alleges.