Composite artificial turf structure with shock absorption and drainageUS6428870Dec 26, 2000Aug 6, 2002William W. BohnhoffSubsurface fluid drainage and storage system and mat especially utilized for such systemUS6450731Jul 24, 2000Sep 17, 2002William W. BohnhoffSystem for applying a liquid, such as a deicing liquid, upon a pavement surfaceUS6551016 *Mar 27, 2001Apr 22, 2003John Kevin GuidonPaver Gu