The Swedish Patent and Registration Office - PRV
At The Swedish Patent and Registration Office (PRV) website you can learn more about intellectual properties and search in their databases, Swedish patent database, Swedish design database and Swedish trademark database among others.
Espacenet : patent search
Information about national and international patents from the European Patent Office.
Google patents
A search engine that indexes the entire collection of issued patents and millions of patent applications made available by the U.S. Patent and Trademark Office. European patent documents (from Aug 2012) are accessible too.
The Lens
The Lens is a worldwide, open-access, free full-text patent informatics resource. It serves as the cyberinfrastructure platform for the Initiative for Open Innovation (IOI).
Patent full-text databases : USPTO
Two databases of U.S. patent documents: Issued Patents (from the first patent 1790 onwards), and Published Applications (since 2001).
Svensk patentdatabas. : Swedish patent database
Here you can search for Swedish patents, public patent applications and European patents (EP patents) validated in Sweden. In Swedish and English.