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 remember a post on this site, in which someone claimed, Pentax was using a simple technology and blocking the other manufacturers by patents, so that they could do it, too, but have to pay a price for it.
That would fit perfectly for the Pentax vs. Nikon patents in this thread.