http://www.freshpatents.com/Ventilation-dtnewntc454.php USPTO Class 454 - Ventilation en-us Mon, 30 Jan 2012 13:32:40 -0800 1000 Wednesday Thursday Friday Saturday Sunday 141 31 http://www.freshpatents.com/index.php?rss=true http://www.freshpatents.com/images/freshpatentsnav_rss.gif http://www.freshpatents.com/-dt20120126ptan20120021680.php Mon, 30 Jan 2012 13:32:40 -0800 A ventilation device for a building is provided. The ventilation device includes a pair of frame elements spaced a distance from each other to define a free passage extending between an inside of the building and an outside of the building in a clearance defined by the distance. A rotating...