I think what you are calling a "flat grind" is what we call a chisel grind, unground on one side and generally full flat or sabre ground on the other. What we call a flat grind is one where the blade is ground with no curvature in (hollow ground) or out (convex ground).
A good place to start reading would be the BladeForums.com Knife FAQs, specifically FAQ: Blade Geometry.
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