Back in 2001 at the Geneva Motor Show, Smart introduced a quirky roadster concept with no doors, no roof and no windscreen called the Crossblade. The Fortwo Cabrio-based concept eventually went into a limited series production the following year with Smart offering a total of 2,000 cars. Fast-forward to today, and Smart appears to be readying a spiritual successor to the Crossblade as the firm’s parent company Mercedes-Benz has trademarked these designs drawings of a two-seater roadster model. Unlike the original Crossblade, which came without doors featuring instead steel safety bars at passenger shoulder height that swing upwards with the help of a gas-operated struts, the roadster model seen in these pictures gets a conventional set of doors. It also features a larger wind deflector surrounding the driver and passenger as well as Smart’s trademark Tridion Safety Cell – albeit redesigned to look like separate safety bars. Unfortunately, the patent filing does not provide any information on the vehicle other than that the designs were submitted on November 16, 2010. However, unless it’s a previous study we’re not aware of, we’d say the car seen here is a new concept model (maybe for Detroit in January or Geneva in March) that could preview a production vehicle as well as the styling of the next generation Smart Fortwo series.