How do I save images of parts that are suitable for patent applications (i.e. no shading, single outline edges)?

Hi.

I have parts designed in Elements/Direct that I need to save as images for submission in a patent application. These images must not have any shading and single black outline edges else they will be rejected.

I have experimented in the Part Properties and Realism pop-out menu, but can't get what I need. The best I can do is to turn off 3d shading in the Realism menu and just show the edges. However, with these settings, faces that curve away out of view do not have a line showing that surface that you see tangentially from that perspective. Hope you know what I mean.

What settings do I need to choose or is there some other way to generate unshaded images with solid black edge outlines?

Thanks

Rajesh