Canon has patented a color-sensitive multi-layered sensor design, showing the company is still pursuing the technology. Like Sigma’s Foveon chips, the multi-layered design allows each of the sensor’s pixels to capture color information without the need for colored filters. The patent, discovered by the Japanese Engineering Accomplishment blog, suggests a system to promote resonance within the sensor, in an attempt to make the lower layers of the sensor more sensitive. (from Egami blog)