How is the grass patent in the United States drawn?

The patent drawing of 1 in American appearance is different from the patent drawing of China, mainly because there are two kinds of lines, one is shaded line and the other is dashed line. The general practice is to export CAD line drawings through three-dimensional modeling. Then convert dwg into Ai or cdr to draw the shadow of American appearance patent. You can see the exchange of drawings for details. The situation of shadow painting in American appearance patent is very complicated, which is not handled professionally, and the application is likely to cost money.