1 The patent drawing of American appearance is different from the patent drawing of China, mainly because there are two kinds of lines, one is the hatched line and the other is the dotted line. The general practice is to export CAD line drawings by three-dimensional modeling. Then, dwg is converted into Ai or cdr to draw shadows of American appearance patents. For details, you can communicate by looking at the drawings. The situation of drawing shadows of American appearance patents is very complicated, which is not a professional treatment, and it is likely to cost money to apply.