Mazda has submitted blueprints to the US Patent & Trademark Office that proves it is developing swan-wing-style doors.
Set to be used on the production version of the RX-9 coupe, the new images suggest the doors will open conventionally but the further they open the door's novel hinge design see them lift the door away from clashing with high kerbs.
Aston Martin already has such a device fitted to all its models that allows the doors to open upwards of an angle of 12 degrees.
According to the patent, Mazda's design goes far further and its able to pivot the doors to 15 degrees.
The evidence of such a device is thought to prove Mazda plans to stay true to its RX Vision concepts that's rumoured to spin-off the production RX-9.
Since the RX Vision concept broke cover in late 2015, Mazda has patented a new rotor-powered sports car design, has outlined its new rotary-powertrain, dubbed SKYACTIV-R, and reports from Japan suggest the RX-9 sports car has been green-lit by Mazda’s board of directors.
Expected to come with around 300kW and weigh less than 1300kg, the RX-9 is set to rival the forthcoming Toyota Supra.