This is an excellent place to learn about the patenting process, from the development of an idea, through applying for a patent, to marketing your patent or product. PENNSYLVANIA RESIDENTS ARE EXCLUDED FROM VISITING THIS SITE. The first thing you encounter is a notice that you must read the Terms of Service before viewing the site. Residents of Pennsylvania (and certain other commercial concerns) are prohibited from viewing or using this site in any way, under threat of a $25,000 fine. I do not know if this is enforceable, but since it does not affect me, I forged on.
I looked at most, but not all, the material. I found the section on patent protection to be especially informative. Hundreds of useful links to other sites related to all phases of the invention process are listed in a section labeled "Good Guys."
Navigation on this site is especially easy, as each selected section contains embedded hyperlinks and an outline of the entire site along the left margin with the current section expanded to include each of the links which appear in the text.