Google Patents includes over 120 million patent publications from 100+ patent offices around the world, as well as many more technical documents and books indexed in Google Scholar and Google Books, and documents from the Prior Art Archive.
The Patent and Trademark Resource Center Program also provides a CBT (computer based training) tutorial with a detailed review of the Seven Step Strategy. The current CBT covers searching using Cooperative Patent Classification (CPC).
A physicist, engineer, and patent searching expert, author David Hitchcock gives you the vocabulary, instructions and strategies you need to search for a patent quickly and easily. He explains how the PTO classifies different types of inventions, so that you can assign your idea to the right class, compare it to related ideas and then determine if it's novel enough to qualify for a patent. Patent Searching Made Easy shows you how do patent searches yourself, on the Internet, at little or no cost. Plus, you'll learn how to:
verify the patent status of an idea
prepare for online searches with the right hardware, software and computer skills
access online patent searching resources
narrow online searches with keywords and Boolean logic
perform database searches at Patent and Trademark Resource Centers (PTRC)