Back Saw Patent Print18x24" Patent Print J. P Arnold Back Saw No 1,541,611. This patent is a copy of the original patent that is on file with the US patent office. The file has been digitally sharpened to press quality, and is offset printed on Neenah AstroParche 65# Cover stock in natural color. These files have been digitally sharpened, but still retain some of the ink dots from the original drawings.