FreshPatents.com: Electricity: motor control systems - USPTO Class 388 Patent Applications Update http://www.freshpatents.com/Electricity--motor-control-systems-dtnewntc388.php USPTO Class 388 - Electricity: motor control systems en-us Wed, 3 Jun 2009 14:40:27 -0700 1000 Wednesday Thursday Friday Saturday Sunday FreshPatents.com 141 31 http://www.freshpatents.com/index.php?rss=true http://www.freshpatents.com/images/freshpatentsnav_rss.gif Method of transition between controls for a ventilation system http://www.freshpatents.com/Method-of-transition-between-controls-for-a-ventilation-system-dt20090528ptan20090136220.php Wed, 3 Jun 2009 14:40:27 -0700 A method of constant airflow control for a ventilation system is disclosed. The method includes various controls to accomplish a substantially constant airflow rate over a significant change of the static pressure in a ventilation duct. One control is a constant I·RPM control, which is primarily used in a low...