Photo: Dariusz Sankowski, Pixabay

The parent company of Google and autonomous car company Waymo has filed new papers in its ongoing case against Uber.

Alphabet claims that Uber has hidden a device that is derived from Waymo's proprietary  technology.

"They were hiding a device," said Alphabet in the legal filing.Alphabet says Uber's attempt to hide a device supports Alphabet's motion for a preliminary court order that would hinder Uber from pursuing its self-driving technology work.

Uber has responded by saying it hasn't hidden any devices and that it did not violate Alphabet's patents.

Alphabet is pressing charges against Uber under a claim that Uber stole Alphabet's confidential self-driving technology.Anthony Levandowski, a former Alphabet executive and the head of its self-driving technology project, is at the center of the case.

Alphabet asserts that Levandowski took 14,000 files from Alphabet's Waymo prior to leaving the company, then launched his own autonomous-truck startup known as Otto.Uber purchased Otto last August.

Alphabet says that among the allegedly stolen files are designs for Alphabet's light detection and ranging technology, which is a primary component in self-driving systems.

Based on the latest filing, Alphabet claims that Uber hid a lidar device that was designed by Levandowski.In addition, Alphabet says, Uber obscured the existence of the device during a hearing held April 12.

Uber denies the charges and states that it created the device.

Alphabet refuses to say if it has conducted a device inspection.Uber opposes Alphabet's allegations saying that those are "demonstrably untrue."