Engine supplier Cosworth has only now terminated its contract to supply the now defunct USF1 outfit for the 2010 season.
The American start-up failed to make it to the grid and folded earlier this year after encountering financial problems.
Cosworth will now join the long list of creditors trying to get money back from the team.
“Cosworth has taken this step with great regret as it had been supporting US F1 over the last few months with regards to a proposed entry for the 2011 season, but US F1’s decision has meant that Cosworth has no choice but to terminate,” a statement from the company said.
“Cosworth is a significant creditor of US F1, and will therefore join the other creditors of the team in seeking settlement of outstanding debts from the managed disposal of the remaining assets of the team.”
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