Quinn Emanuel Urquhart & Sullivan ended its relationship with Uber due to fixed fee arrangements with the company that were described as having been at rates "that are not financially viable" for the firm, according to court filings.

The details behind the firm's decision to end its lawyer-client relationship were revealed in a recently filed document in the ongoing legal battle between the ride-hailing giant and Alphabet self-drive venture Waymo.

In a 20 July filing from Uber, it emerged that Quinn Emanuel, which now represents Waymo in the dispute over driverless car technology, emailed a number of top lawyers in Uber's legal department, including current chief legal officer Salle Yoo, to cut off the relationship.