"Patent it yourself" is THE classic book for inventors about how to go about patenting an invention.

It covers all aspects of the patent process: from patent searching, to preparing and filing a patent application, convincing the Patent Office Examiner to grant your patent, filing international patents, and more...

It is universally recommended to inventors by patent professionals. In fact, many patent attorneys secretly use it as a reference! Most inventors that read this book learn quite a lot about the patent process. While they do learn the intricacies of the patent system, however, most inventors decide after reading "Patent It Yourself" that they probably cannot actually patent-it-by-themselves, and ultimately seek the assistance of a registered patent attorney (although now they are more knowledgeable about what needs to be done and how to work effectively with the patent attorney).