While Apple's late CEO Steve Jobs wasn't a big fan of the "dumb stylus" of yesteryear when he first introduced the iPhone back in 2007, he knew that one day the technology would give rise to an advanced iPen that would finally provide iDevice users with true to life writing capabilities on an iPhone or iPad. While Microsoft, Samsung and others have offered digital pens for many years, Apple has been quietly working on an advanced digital pen. Their R&D in this area has been extensive as you'll find reviewing our smart pen archives. Today the US Patent & Trademark Office published yet another patent application from Apple regarding a digital pen. This invention adds dynamic visual indicators such as a battery indicator and more. Apple also hints that they could add a projector to this new pen. As one of Apple's longest standing projects to date, there's still hope that one of these days we'll see what a smart pen could really do.