SciFinder covers patents from around the world. Patent records from nine major patent offices worldwide that meet CAS selection criteria are available within two days of the patent's publication, and fully indexed by CAS scientists within 27 days from the date of issue. After your search, you can Refine -- Document Type -- Patent to narrow your results to only patents.
This database lets you access 156 years of Canadian patent descriptions and images. You can search, retrieve and study more than 2,570,000 patent documents.
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.