The knives were not great quality, but Colt once made (and maybe still does)
serrated folders that could be sharpened in a plain old "pull it through" carbide sharpener. The serrations were actually just very narrow slits cut into the blade at regular repeating angles. It looked like /////////// along the bottom edge of the blade when held horizontal. I never owned or used one, but it looked like a simple way to make a serrated knife easier to sharpen. Also, on some knives where one side of the blade has angled serrations, but the other side keeps the same flat angle up to the serrations, I just run a DMT slab sharpener over the flat side to sharpen up the serrations. I wish I could explain that better. If you don't catch what I mean, let me know.
serrated folders that could be sharpened in a plain old "pull it through" carbide sharpener. The serrations were actually just very narrow slits cut into the blade at regular repeating angles. It looked like /////////// along the bottom edge of the blade when held horizontal. I never owned or used one, but it looked like a simple way to make a serrated knife easier to sharpen. Also, on some knives where one side of the blade has angled serrations, but the other side keeps the same flat angle up to the serrations, I just run a DMT slab sharpener over the flat side to sharpen up the serrations. I wish I could explain that better. If you don't catch what I mean, let me know.