How to Make Patent Drawings: A Patent It Yourself Companion cover
How to Make Patent Drawings: A Patent It Yourself Companion
by Jack Lo, David Pressman
ISBN: 1413306535
Buy on Amazon
Found in 1 comment on Hacker News
kirubakaran · 2007-12-19 · Original thread
I found this book to be very useful:

Patent Pending In 24 Hrs

http://www.amazon.com/Patent-Pending-Hours-Richard-Stim/dp/1...

I also bought (but haven't yet read):

http://www.amazon.com/Patent-Yourself-David-Pressman/dp/1413...

http://www.amazon.com/How-Make-Patent-Drawings-Companion/dp/...