NEW YORK ( TheStreet) -- Talks to resolve a dispute over who owns about $4 billion claimed by both JPMorgan Chase ( JPM) and Washington Mutual have accelerated over the past few days, the Wall Street Journal reports. "There seems to be some momentum," said a lawyer who represents Washington Mutual. Washington Mutual entered bankruptcy in September 2008 when federal regulators seized its banking operations and sold them to JPMorgan. Lawyers for Washington Mutual say the $4 billion represented deposits made by the parent company of the failed thrift and should be used to repay creditors, the Journal says. JPMorgan argues that it owns the disputed $4 billion, which it views as a capital contribution to Washington Mutual's banking operations from its holding company. Washington Mutual and JPMorgan also are arguing over ownership of trust-preferred securities valued at $4 billion, federal tax refunds valued at $5.6 billion, a pension fund for thousands of employees and rights to the Washington Mutual name, according to the Journal. Follow TheStreet.com on Twitter and become a fan on Facebook.