Espacenet
Accessible to beginners and experts and is updated daily. It contains over than 95 million patent documents from around the world. Supporting information can help you understand whether a patent has been granted and if it is still in force.
Google Patents
Search and read the full text of patents from around the world with this database and find prior art in the index of non-patent literature.
USPTO Patent Full-Text and Image Database
Search all granted patents.
USPTO Patent Application Database
Search all of the applications for patent protection.
PatentScope
from the World Intellectual Property Organization (WIPO)
The Lens
Serves nearly all of the patents in the world as open, annotatable digital public goods that are integrated with scholarly and technical literature along with regulatory and business data.
