Patent databases
There is a large selection of different types of patent databases that can be used to search for patent documents. Some are free to use, while others require subscription.
VALUA has made an overview of useful patent databases:
Espacenet
Espacenet is an excellent database developed by the European Patent Organization (EPO). It is possible to search for existing European patents and published patent applications in this database.
PATENTSCOPE
PATENTSCOPE is a search engine from the World Intellectual Property Organization (WIPO). The database allows users to search for published international patent applications (PCT applications).
PVS Database:
The Patent and Trademark Office (PVS) is the authority that administers patents and patent applications in Denmark. PVS also has a register where it is possible to search for patents and utility models registered in Denmark.