Asymmetric spring components for mattress and other flexible support structures, in the form of helical coil springs with turns in the coil body having varying pitch angles and radii, and a single support end for use in a one sided innersprings in one-sided mattresses. The coil springs are asymmetric...http://www.google.com/patents/US7178187?utm_source=gb-gplus-sharePatent US7178187 - Asymmetric spring components and innersprings for one-sided mattresses
