Patent ID: 8601882
Filing Date: 2013-12-10
Classification: G01N

Abstract:
1. An apparatus comprising: a housing defining an interior chamber; a first piston adjacent a second piston in the interior chamber and forming an interstitial region between the first piston and the second piston, the first piston and second piston moveable relative to each other in the interior chamber; an interior volume defined by the first piston and second piston, the interior volume having a central portion at a region proximate the interstitial region and enlarged portions at opposite ends of the central portion, a cross-section of the enlarged portions being larger than a cross-section of the central portion; and a first port opening in the interior chamber proximate the interstitial region, wherein the first port is operable to introduce fluid pressure to the interstitial region to apply a separation force operable to separate the first piston and the second piston.