Fluidic waveguides have inward surfaces or areas that face each other, separated by a channel region that can be covered. For example, an integrally formed channel component can include two walls parts and a connecting part, with inward surfaces on the wall parts and, extending between them, a base surface;...http://www.google.co.uk/patents/US20090016672?utm_source=gb-gplus-sharePatent US20090016672 - Producing Fluidic Waveguides
