Publication coverage: 1790 - present (updated weekly)The USPTO's patent databases contain more than 9 million patents issued from 1790 to the present and 3 million published applications from 2001 forward.
Publication coverage: 1907 - present.SciFinder® is the world's premier chemical information database. Produced by the Chemical Abstracts Service (CAS), a division of the American Chemical Society, SciFinder® provides access to chemical structures, properties, spectra, reactions, and literature sourced from Chemical Abstracts (CAPlus) and MEDLINE. Regulated chemical information and chemical supplier catalogues are also searchable. SciFinder® indexes 50,000 journal titles (historical and current) and patents from 63 patent authorities. As of November 2017, it contained more than 45 million literature references.
Publication coverage: 1947 - presentThis web portal, formerly known as SciTech Connect, contains more than 3 million references (445,000 full-text) to reports, articles, patents, datasets, presentations, software, and other scientific and technical information arising from research supported by the U.S. Department of Energy.
Publication coverage: 1869 - present (updated weekly)Produced by the Canadian Intellectual Property Office (CIPO), this database contains more than 2 million Canadian patents from 1869 to the present.
Publication coverage: 1800s - present (varies by country; updated weekly)The largest public patent database on the internet, Espacenet contains more than 100 million patent documents from more than 90 countries including Canada and the U.S., plus 2 million records for non-patent literature cited in EPO search reports.
Publication coverage: 1800s - present (varies by country; updated weekly)Explore 66 million patent documents from more than 51 regional and national patent offices. Major national collections include Canada, China, European Patent Office, Japan, Korea, Russia, U.K. and U.S. Advanced functions include chemical structure and biological sequence search; cross-lingual translation search; and national status information.