How To Make Patent Drawings: A Patent It Yourself Companion 4th Edition 
A perfect companion to Patent It Yourself.
Reviews
This book was able to get me the rest of the way there by detailing the regulations that the USPTO puts on drawings. They're not really difficult, but they ARE specific. Don't be intimidated by them. The very simple drawing style specified by the USPTO is to allow clear reproduction and printing. My attorney charges $295 per figure, and one page can have 2 or 3 figures on it! The last application we submitted had about a dozen figures total. Some of the expense is the work of integrating and describing the drawings, but it is guaranteed to save you money if you do your own drawings. Besides, this ensures that you will be satisfied with the quality and accuracy. Don't forget you can also have the draftsman do the difficult 3-D "Figure 1" bit, and you do the simpler stuff. Like me, I'll bet you'll find it easier than you thought!
Alex
