United States Patent and Trademark Office (USPTO)
USPTO – Getting started with patents
USPTO – General information concerning patent
USPTO – What are patents, trademarks, servicemarks, and copyrights
USPTO – Process for obtaining utility patent
USPTO – Frequently Asked Questions
USPTO – Learning resources
USPTO – Patents search
USPTO – Patent applications search
USPTO – Patent filing fees
USPTO – Protecting intellectual property rights overseas
USPTO – PCT chapter I forms & information
USPTO – PCT chapter II forms & information
USPTO – PCT fees
USPTO – Manual of patent examination procedure (MPEP)