There is provided a screening panel having screening apertures and which can be secured to a support frame side-by-side with similar panels to form a screen deck. The panel has ridges along two of its sides which project above the screening surface. The ridges form a channel which confines liquid flowing...http://www.google.es/patents/US4762610?utm_source=gb-gplus-sharePatente US4762610 - Screening arrangement
