The WIPO Patent Drafting Manual is a preeminent treatise on patent drafting, published by the World Intellectual Property Organization and used by students worldwide. Though I am credited (on page 10), I am not the principal author of the Manual. Tom Ewing still deserves a lion’s share of the author credit for writing much of the first edition, though I am very proud that my contributions and edits were included in this second edition of the Manual. Download it for an excellent guide on drafting patent applications.