Originally Posted by Olivier 
The Nikon patent is also interesting. It has the advantage that all the photons are captured, as in the Foveon sensor. On the other hand I wonder how hard/expensive it would be to manufacture all these tiny dichroic mirrors. The proposed Pentax sensor does not seem to be much more difficult to manufacture than conventional sensors.
I believe this is exactly the same way the Foveon sensor works, with dichroic mirrors separating light, or am I wrong? I thought this design was patented.