http://www.freshpatents.com/Rotary-expansible-chamber-devices-dtnewntc418.php USPTO Class 418 - Rotary expansible chamber devices en-us Mon, 30 Jan 2012 13:32:09 -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/-dt20120126ptan20120020823.php Mon, 30 Jan 2012 13:32:09 -0800 The present document describes a rotating and reciprocating piston device comprising: chambers disposed about a chamber axis, the chambers having two ends and a port for passage of a fluid at each one of the ends of the chambers; pistons having two ends, each one of the pistons slidably positioned... http://www.freshpatents.com/-dt20120126ptan20120020824.php Mon, 30 Jan 2012 13:32:09 -0800 A shunt pulsation trap for a Roots supercharger reduces pulsation, NVH and improves efficiency without significantly increasing overall size of the supercharger. Generally, a Roots supercharger with the shunt pulsation trap has a pair of interconnected and synchronized parallel multi-helical-lobe rotors housed in a transfer chamber with the same number... http://www.freshpatents.com/-dt20120126ptan20120020825.php Mon, 30 Jan 2012 13:32:09 -0800 A displacement pump, including a pump chamber and a regulating chamber which are separated from each other by a piston, wherein the pump has a device with which fluid flowing from the pump chamber toward the regulating chamber can be drained....