How to draw patent black and white lines?

Patent black-and-white line drawing is made by solidwors or ug and proe software. Engineering drawings can be directly exported, the effect is two-dimensional line drawing, and then saved as dwg or dxf format. This format can be directly modified in CAD, and lines can also be processed by vector software such as cdr or ai. The drawings made by these softwares meet the requirements of patent drawings in various countries, hoping to help you.